CN112583472A - Multicast file sending, receiving and transmitting method and device for batch upgrading of satellite equipment - Google Patents
Multicast file sending, receiving and transmitting method and device for batch upgrading of satellite equipment Download PDFInfo
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- CN112583472A CN112583472A CN202011574127.6A CN202011574127A CN112583472A CN 112583472 A CN112583472 A CN 112583472A CN 202011574127 A CN202011574127 A CN 202011574127A CN 112583472 A CN112583472 A CN 112583472A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/185—Space-based or airborne stations; Stations for satellite systems
- H04B7/1851—Systems using a satellite or space-based relay
- H04B7/18513—Transmission in a satellite or space-based system
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/185—Space-based or airborne stations; Stations for satellite systems
- H04B7/1851—Systems using a satellite or space-based relay
- H04B7/18519—Operations control, administration or maintenance
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L41/00—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
- H04L41/08—Configuration management of networks or network elements
- H04L41/0803—Configuration setting
- H04L41/0813—Configuration setting characterised by the conditions triggering a change of settings
- H04L41/082—Configuration setting characterised by the conditions triggering a change of settings the condition being updates or upgrades of network functionality
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L67/00—Network arrangements or protocols for supporting network services or applications
- H04L67/01—Protocols
- H04L67/06—Protocols specially adapted for file transfer, e.g. file transfer protocol [FTP]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L67/00—Network arrangements or protocols for supporting network services or applications
- H04L67/01—Protocols
- H04L67/10—Protocols in which an application is distributed across nodes in the network
- H04L67/104—Peer-to-peer [P2P] networks
- H04L67/1074—Peer-to-peer [P2P] networks for supporting data block transmission mechanisms
- H04L67/1078—Resource delivery mechanisms
- H04L67/1085—Resource delivery mechanisms involving dynamic management of active down- or uploading connections
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L67/00—Network arrangements or protocols for supporting network services or applications
- H04L67/14—Session management
- H04L67/141—Setup of application sessions
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
- H04L69/16—Implementation or adaptation of Internet protocol [IP], of transmission control protocol [TCP] or of user datagram protocol [UDP]
- H04L69/164—Adaptation or special uses of UDP protocol
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W24/00—Supervisory, monitoring or testing arrangements
- H04W24/02—Arrangements for optimising operational condition
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W76/00—Connection management
- H04W76/10—Connection setup
- H04W76/15—Setup of multiple wireless link connections
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Abstract
The invention provides a multicast file sending, receiving and transmitting method and device for upgrading satellite equipment in batches, wherein the multicast file sending method is applied to a central station and comprises the following steps: acquiring an upgrade package file according to a remote station equipment list needing to be upgraded; sending an open type signaling to each remote station, wherein the open type signaling comprises a remote station equipment list, a multicast IP and a data transmission port number; after a predetermined time interval, establishing a multicast UDP connection based on the multicast IP and the data transmission port number with the remote station existing in the remote station equipment list; fragmenting the upgrade package file according to the default fragmentation size and then sending a fragmented data message to a remote station establishing multicast UDP connection; after completing transmission of all the fragmented data messages, sending an error correction signaling to collect fragmented data message information needing to be retransmitted from a remote station establishing multicast UDP connection; after a preset time interval, retransmitting the fragmented data message needing to be retransmitted; and sending an ending instruction to end the transmission.
Description
Technical Field
The invention relates to a satellite communication technology, in particular to a technology for bearing Ethernet messages in a satellite channel, and particularly relates to a method and a device for sending, receiving and transmitting multicast files of batch upgrading satellite equipment.
Background
As shown in fig. 1, in the star-shaped satellite frequency division system network, a central station and a remote station are both devices with one transmission and multiple receptions, and the central station is responsible for transferring data messages from a satellite and controlling the remote station. In the system, a central station needs to remotely upgrade a plurality of remote station devices, and the central station needs to transmit an upgrade packet file to the remote station via an air interface and execute an upgrade instruction. Due to the problem of time delay of a spatial transmission link, when a typical tcp protocol is used for file transmission, the transmission efficiency is low; when the UDP broadcast method is used to broadcast the file data, the overall transmission efficiency can be improved, but there is no reliability guarantee.
Disclosure of Invention
The invention mainly aims at the defects of the prior art, provides a multicast file sending, receiving and transmitting method and device for upgrading satellite equipment in batches, effectively solves the efficiency problem of remote upgrading of a plurality of remote station equipment, and saves labor and time cost.
In order to achieve the above object, the present invention employs the following techniques:
a multicast file sending method for upgrading satellite equipment in batches is applied to a central station and comprises the following steps:
acquiring an upgrade package file according to a remote station equipment list needing to be upgraded;
sending an open type signaling to each remote station, wherein the open type signaling comprises a remote station equipment list, a multicast IP and a data transmission port number;
after a predetermined time interval, establishing a multicast UDP connection based on the multicast IP and the data transmission port number with the remote station existing in the remote station equipment list;
fragmenting the upgrade package file according to the default fragmentation size and then sending a fragmented data message to a remote station establishing multicast UDP connection;
after completing transmission of all the fragmented data messages, sending an error correction signaling to collect fragmented data message information needing to be retransmitted from a remote station establishing multicast UDP connection;
after a preset time interval, retransmitting the fragmented data message needing to be retransmitted;
and sending an ending instruction to end the transmission.
Further, for the obtained upgrade package file, calculating the total number of message fragments of the upgrade package file according to the default fragment size, and encapsulating an open type signaling, an end type signaling and an error correction signaling;
the open type signaling comprises a file name, a file length, an md5 value, a message fragment total number, a default fragment size, a multicast IP (Internet protocol), a data transmission port number and a remote station equipment list;
the ending type signaling comprises a file name, a file length, an md5 value, a multicast IP and a data transmission port number;
the error correction signaling comprises an error correction signaling type, a remote station equipment list and a fragment to be error corrected, wherein the error correction signaling type comprises error correction starting data, error correction ending data and error correction data;
and after the upgrade package file is fragmented according to the default fragment size, the fragmented fragment data message carries the fragment serial number, the effective data length and the transmission content.
Further, after completing transmission of all the fragmented data packets, executing error correction processing according to preset error correction times, wherein each error correction processing comprises:
sending error correction signaling with the type of the error correction signaling as error correction starting;
collecting information of fragmented data messages needing to be retransmitted from a remote station establishing multicast UDP connection, wherein the retransmitted fragmented data messages are fragmented data messages which are fed back by the remote station through error correction signaling with the type of the error correction signaling being error correction data and need to be received but are not received;
after a preset time interval, resending the fragmented data message needing to be retransmitted to finish one-time error correction;
after the preset error correction times are all completed, sending error correction signaling with the type of the error correction signaling as the error correction finishing, and finishing the error correction;
sending an ending type signaling to enable the remote station to close the multicast UDP connection and end the transmission;
and sending an upgrade instruction to enable the remote station to complete upgrade according to the received upgrade package file, wherein the received upgrade package file refers to the fragmented data message set received by the remote station.
The multicast file sending device for upgrading the satellite equipment in batches comprises a signaling module and a multicast protocol module which are arranged in a central station, wherein the central station and a plurality of remote stations are positioned in a star-shaped satellite frequency division system network;
the signaling module is used for acquiring a remote station equipment list needing to be upgraded;
the multicast protocol module is used for acquiring an upgrade package file according to the remote station equipment list acquired by the signaling module;
the signaling module is used for packaging an open type signaling according to the upgrade packet file acquired by the multicast protocol module, wherein the open type signaling comprises a remote station equipment list, a multicast IP and a data transmission port number;
the multicast protocol module is used for sending the opening type signaling packaged by the signaling module to each remote station; and for establishing a multicast UDP connection based on the multicast IP and the data transfer port number with the remote station existing in the remote station device list after a predetermined time interval; and is used for fragmenting the upgrade package file according to the default fragmentation size and then sending a fragmented data message to a remote station establishing multicast UDP connection; and is used for sending error correction signaling after finishing all the fragmented data message transmission, so as to collect fragmented data message information needing retransmission from a remote station establishing multicast UDP connection; and is used for retransmitting the fragmented data message which needs to be retransmitted after a preset time interval; and is used for sending an end instruction to end the transmission.
Further, the signaling module is used for calculating the total number of message fragments of the upgrade package file according to the upgrade package file and the default fragment size, and packaging an open type signaling, a finish type signaling and an error correction signaling;
the open type signaling comprises a file name, a file length, an md5 value, a message fragment total number, a default fragment size, a multicast IP (Internet protocol), a data transmission port number and a remote station equipment list;
the ending type signaling comprises a file name, a file length, an md5 value, a multicast IP and a data transmission port number;
the error correction signaling comprises an error correction signaling type, a remote station equipment list and a fragment to be error corrected, wherein the error correction signaling type comprises error correction starting data, error correction ending data and error correction data;
and after the multicast protocol module fragments the upgrade package file according to the default fragment size, the fragmented fragment data message carries a fragment serial number, an effective data length and transmission content.
Further, the multicast protocol module is configured to execute error correction processing according to a preset error correction frequency after completing transmission of all fragmented data packets, where each error correction processing includes:
sending error correction signaling with the type of the error correction signaling as error correction starting;
collecting information of fragmented data messages needing to be retransmitted from a remote station establishing multicast UDP connection, wherein the retransmitted fragmented data messages are fragmented data messages which are fed back by the remote station through error correction signaling with the type of the error correction signaling being error correction data and need to be received but are not received;
after a preset time interval, resending the fragmented data message needing to be retransmitted to finish one-time error correction;
the multicast protocol module is used for sending error correction signaling with the type of error correction signaling being the error correction finishing type after the preset error correction times are all completed, and finishing error correction; and is used for sending an ending type signaling after finishing error correction so as to enable the remote station to close the multicast UDP connection and finish the transmission;
and the signaling module is used for sending an upgrading instruction after the multicast protocol module finishes the transmission so as to enable the remote station to complete upgrading according to the received upgrading packet file, wherein the received upgrading packet file is the fragmented data message set received by the remote station.
A multicast file receiving method for upgrading satellite equipment in batches is applied to a remote station and comprises the following steps:
receiving an open type signaling sent by a central station, wherein the open type signaling comprises a remote station equipment list, a multicast IP and a data transmission port number, and the open type signaling is obtained by packaging an upgrade packet file acquired by the central station according to the remote station equipment list needing to be upgraded;
judging whether the terminal exists in a remote station equipment list or not, if so, establishing multicast UDP connection with a central station based on a multicast IP and a data transmission port number;
receiving a fragmented data message sent by a central station through multicast UDP connection, wherein the sent fragmented data message is obtained by fragmenting an upgrade packet file according to the default fragmentation size by the central station;
receiving an error correction signaling sent by a central station, and feeding back fragmented data message information needing to be retransmitted to the central station, wherein the retransmitted fragmented data message information is a fragmented data message which needs to be received but is not received;
after a preset time interval, receiving a retransmitted fragmented data message sent by a central station;
and receiving an ending instruction sent by the central station, and ending the transmission.
The multicast file receiving device for upgrading the satellite equipment in batches comprises a multicast protocol module arranged on each remote station, wherein each remote station and a central station are positioned in a star-shaped satellite frequency division system network;
the system comprises a multicast protocol module, a central station and a multicast server, wherein the multicast protocol module is used for receiving an open type signaling sent by the central station, the open type signaling comprises a remote station equipment list, a multicast IP and a data transmission port number, and the open type signaling is obtained by packaging an upgrade packet file acquired by the central station according to the remote station equipment list needing to be upgraded;
and is used for judging whether the terminal station exists in the remote station equipment list, if so, the terminal station establishes multicast UDP connection with the central station based on the multicast IP and the data transmission port number;
the system is used for receiving the fragmented data message sent by the central station through multicast UDP connection, and the sent fragmented data message is obtained by fragmenting the upgrade packet file according to the default fragmentation size by the central station;
the system comprises a central station, a data transmission unit and a data transmission unit, wherein the data transmission unit is used for receiving an error correction signaling sent by the central station and feeding back fragmented data message information needing to be retransmitted to the central station, and the retransmitted fragmented data message information is a fragmented data message needing to be received but not received;
the central station is used for receiving the retransmitted fragmented data message sent by the central station after a preset time interval;
and is used for receiving an end instruction sent by the central station to end the transmission.
A multicast file transmission method for upgrading satellite equipment in batches is applied to a central station and a plurality of remote stations which are in a star-shaped satellite frequency division system network, and comprises the following steps:
the central station acquires an upgrade package file according to a remote station equipment list needing to be upgraded;
the central station sends an open type signaling to each remote station, wherein the open type signaling comprises a remote station equipment list, a multicast IP and a data transmission port number;
the remote station judges whether the remote station exists in a remote station equipment list or not according to the received opening type signaling, and if the remote station exists, the remote station establishes multicast UDP connection with the central station based on the multicast IP and the data transmission port number;
the central station fragments the upgrade package file according to the default fragment size and sends a fragmented data message to a remote station establishing multicast UDP connection;
the remote station receives the fragmented data message and ignores the fragmented data message which is repeatedly received;
after completing transmission of all the fragment data messages, the central station sends error correction signaling;
the remote station receives the error correction signaling, and feeds back the fragmented data message which needs to be received but is not received to the central station by the fragmented data message information which needs to be retransmitted;
after a preset time interval, the central station retransmits the fragmented data message to be retransmitted;
the remote station receives the retransmitted fragmented data message;
the central station sends an ending instruction;
and the remote station closes the multicast UDP connection according to the received finishing instruction, and finishes the transmission.
A multicast file transmission device for upgrading satellite equipment in batches includes: the system comprises a central signaling module and a central multicast protocol module which are arranged in a central station, and a remote multicast protocol module which is arranged in each remote station, wherein the central station and each remote station are in a star satellite frequency division system network;
the central signaling module is used for acquiring a remote station equipment list needing to be upgraded;
the central multicast protocol module is used for acquiring an upgrade package file according to the remote station equipment list acquired by the central signaling module;
the central signaling module is used for packaging an open type signaling according to the upgrade packet file acquired by the central multicast protocol module, wherein the open type signaling comprises a remote station equipment list, a multicast IP and a data transmission port number;
the central multicast protocol module is used for sending the open type signaling to each remote station;
the remote multicast protocol module is used for receiving the open type signaling and judging whether a remote station where the remote station is located exists in a remote station equipment list or not, if so, the remote multicast protocol module establishes multicast UDP connection with the central multicast protocol module based on the multicast IP and the data transmission port number;
the central multicast protocol module is used for fragmenting the upgrade package file according to the default fragment size and sending a fragmented data message to the far-end multicast protocol module which establishes the multicast UDP connection;
the far-end multicast protocol module is used for receiving the fragmented data messages and neglecting the fragmented data messages which are repeatedly received;
the central multicast protocol module is used for sending error correction signaling after completing transmission of all the fragmented data messages;
the far-end multicast protocol module is used for receiving the error correction signaling and feeding the fragmented data messages which need to be received but are not received back to the central multicast protocol module by the fragmented data message information which needs to be retransmitted;
the central multicast protocol module is used for retransmitting the fragmented data messages needing to be retransmitted after a preset time interval;
the remote multicast protocol module is used for receiving the retransmitted fragmented data message;
the central multicast protocol module is used for sending an ending instruction;
and the remote multicast protocol module is used for receiving the ending instruction, closing the multicast UDP connection and ending the transmission.
The invention has the beneficial effects that:
1. the transmission protocol is transmitted by using a multicast mode, so that a plurality of devices can be upgraded at one time, the time and frequency occupied by forward bandwidth are reduced, the problem of transmitting an upgrade packet for many times is avoided, and the upgrade efficiency of remote station devices is improved.
2. The transmission protocol adopts an increment and multiple error correction mechanism, so that the invalid transmission of data is reduced, and the retransmission of a complete upgrade packet caused by transmission errors is avoided.
3. The error correction times in the transmission protocol can be configured, and can be adjusted according to the error rate of the forward link, so that the method is suitable for different link environments and ensures the transmission reliability.
4. After the parameter configuration is completed, one-click upgrade can be supported, and the labor consumption and the operation and maintenance cost are effectively reduced.
Drawings
The drawings described herein are for illustrative purposes only of selected embodiments and not all possible implementations, and are not intended to limit the scope of the present disclosure.
Fig. 1 is a star satellite frequency division system network topology diagram.
Fig. 2 is a flowchart of a multicast file sending method for upgrading satellite devices in batches according to an embodiment of the present disclosure.
Fig. 3 is a structural diagram of a multicast file transmitting apparatus for upgrading satellite devices in batches according to an embodiment of the present application.
Fig. 4 is a flowchart of a multicast file receiving method for upgrading satellite devices in batches according to an embodiment of the present disclosure.
Fig. 5 is a structural diagram of a multicast file receiving apparatus for upgrading satellite devices in batches according to an embodiment of the present application.
Fig. 6 is a flowchart of a multicast file transmission method for upgrading satellite devices in batches according to an embodiment of the present application.
Fig. 7 is a structural diagram of a multicast file transmission apparatus for upgrading satellite devices in batches according to an embodiment of the present application.
Fig. 8 is a schematic diagram of a multicast file protocol transmission flow according to an embodiment of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the following detailed description of the embodiments of the present invention is provided with reference to the accompanying drawings, but the described embodiments of the present invention are a part of the embodiments of the present invention, not all of the embodiments of the present invention.
The application scenario of the embodiment of the present application is a star satellite frequency division system network as shown in fig. 1, where both the central station and the remote station are devices with one transmission and multiple receptions, and the central station is responsible for transferring data messages from a satellite and controlling the remote station.
Example one
The embodiment provides a multicast file sending method for upgrading satellite equipment in batches, which is applied to a central station.
As shown in fig. 2, a flowchart of a multicast file sending method according to this embodiment includes the following steps:
s1: according to the remote station equipment list, a plurality of remote station equipment needing to be upgraded are selected by a user at a central station, and an upgrading execution instruction initiated by the user is responded to generate and obtain the remote station equipment list needing to be upgraded.
S2: and acquiring an upgrade package file.
And further acquiring/preparing an upgrade package file for upgrading the remote station equipment according to the remote station equipment list needing upgrading.
And calculating the total number of message fragments of the upgrade package file according to the default fragment size of the obtained upgrade package file. The slice default size may be set to 512 bytes.
S3: and sending an open type signaling to each remote station, wherein the open type signaling comprises a remote station equipment list, a multicast IP and a data transmission port number. The open type signaling is obtained by the central station according to the upgrade package file.
The open type signaling comprises a file name, a file length, an md5 value, a message fragment total number, a default fragment size, a multicast IP, a data transmission port number and a remote station equipment list.
Besides the encapsulation opening type signaling, the central station also encapsulates the end type signaling and the error correction signaling for standby. The end type signaling comprises a file name, a file length, an md5 value, a multicast IP and a data transmission port number. The error correction signaling comprises an error correction signaling type, a remote station device list and a fragment to be error corrected, wherein the error correction signaling type comprises starting error correction, ending error correction and error correction data.
S4: after a predetermined time interval, for example, after waiting for 2s, the central station establishes a multicast UDP connection based on the multicast IP and the data transmission port number with the remote station existing in the remote station device list.
For example, the default transport protocol uses the multicast IP of 224.0.0.1 and the data transmission port number of 8888, and as the transport management signaling, the remote station can use the port number of 8888 to establish the UDP connection and join the multicast IP group 224.0.0.1.
S5: and fragmenting the upgrade package file according to the default fragmentation size and then sending a fragmented data message to the remote station establishing the multicast UDP connection. And after the upgrade package file is fragmented according to the default fragment size, the fragmented fragment data message carries the fragment serial number, the effective data length and the transmission content.
S6: and after the transmission of all the fragmented data messages is finished, sending an error correction signaling to collect the fragmented data message information needing to be retransmitted from the remote station establishing the multicast UDP connection.
Specifically, after transmission of all fragmented data packets is completed, error correction processing is performed according to a preset error correction frequency, generally 2 to 3 times, which can meet the requirements of most links, where each error correction processing includes:
sending error correction signaling with the type of the error correction signaling as error correction starting;
collecting information of fragmented data messages needing to be retransmitted from a remote station establishing multicast UDP connection, wherein the retransmitted fragmented data messages are fragmented data messages which are fed back by the remote station through error correction signaling with the type of the error correction signaling being error correction data and need to be received but are not received;
s7: after a predetermined time interval, for example, after waiting for 5s, the fragmented data packet that needs to be retransmitted is retransmitted, and one error correction is completed.
And after the preset error correction times are all completed, sending error correction signaling with the type of the error correction signaling being the error correction ending signaling, and ending the error correction.
S8: and sending a finishing type signaling to enable the remote station to close the multicast UDP connection and finish the transmission.
After the transmission is finished, the central station sends an upgrading instruction so that the remote station finishes upgrading according to the received upgrading packet file, wherein the received upgrading packet file refers to the fragmented data message set received by the remote station.
Example two
The present embodiment provides a multicast file sending apparatus for upgrading satellite devices in batches, as shown in fig. 3, including a signaling module and a multicast protocol module, which are provided in a central station, where the central station and a plurality of remote stations are located in a star-like satellite frequency division system network.
In the working mode description of this example:
first, the signaling module obtains a list of remote station devices that need to be upgraded. Specifically, a plurality of remote station devices needing to be upgraded are selected from a central station according to a user, and an upgrade execution instruction initiated by the user is responded to generate and obtain a remote station device list needing to be upgraded.
Then, the multicast protocol module obtains the upgrade package file according to the remote station equipment list obtained by the signaling module.
Then, the signaling module calculates the total number of message fragments of the upgrade package file according to the upgrade package file and the default fragment size, and encapsulates the opening signaling, the ending signaling and the error correction signaling.
The open type signaling comprises a file name, a file length, an md5 value, a message fragment total number, a default fragment size, a multicast IP, a data transmission port number and a remote station equipment list.
The end type signaling comprises a file name, a file length, an md5 value, a multicast IP and a data transmission port number.
The error correction signaling comprises an error correction signaling type, a remote station device list and a fragment to be error corrected, wherein the error correction signaling type comprises starting error correction, ending error correction and error correction data.
The multicast protocol module then sends the signaling module encapsulated open type signaling to each remote station.
Then, after a predetermined time interval, for example, after waiting for 2s, the multicast protocol module establishes a multicast UDP connection based on the multicast IP and the data transmission port number with the remote station existing in the remote station device list.
Then, the multicast protocol module fragments the upgrade package file according to the default fragment size and then sends a fragment data message to the remote station which establishes the multicast UDP connection. The fragmented data message carries the fragment serial number, the effective data length and the transmission content.
Then, after finishing all the transmission of the fragmented data message, the multicast protocol module sends an error correction signaling to collect the fragmented data message information to be retransmitted from the remote station establishing the multicast UDP connection.
Then, the multicast protocol module resends the fragmented data message which needs to be retransmitted after a preset time interval.
Then, the multicast protocol module sends an end instruction to end the transmission.
As a further specific working mode:
after completing transmission of all fragmented data packets, the multicast protocol module executes error correction processing according to preset error correction times, for example, 2 to 3 times, where each error correction processing includes:
sending error correction signaling with the type of the error correction signaling as error correction starting;
collecting information of fragmented data messages needing to be retransmitted from a remote station establishing multicast UDP connection, wherein the retransmitted fragmented data messages are fragmented data messages which are fed back by the remote station through error correction signaling with the type of the error correction signaling being error correction data and need to be received but are not received;
and after the preset time interval of 5s, retransmitting the fragmented data message needing to be retransmitted, and finishing one-time error correction.
And after the preset error correction times are all completed, the multicast protocol module sends error correction signaling with the type of the error correction signaling being the error correction finishing type, and finishes the error correction.
After finishing error correction, sending a finishing type signaling to enable the remote station to close the multicast UDP connection and finish the transmission;
after the multicast protocol module finishes the transmission, the signaling module sends an upgrade instruction so that the remote station finishes the upgrade according to the received upgrade package file, wherein the received upgrade package file refers to the fragmented data message set received by the remote station.
EXAMPLE III
This example provides a multicast file receiving method for upgrading satellite devices in batches, which is applied to a remote station, and a flowchart of the method is shown in fig. 4, and includes the following steps:
s1: and receiving an open type signaling sent by the central station, wherein the open type signaling comprises a remote station equipment list, a multicast IP and a data transmission port number, and the open type signaling is obtained by packaging an upgrade packet file acquired by the central station according to the remote station equipment list needing to be upgraded.
The specific open type signaling comprises a file name, a file length, an md5 value, a message fragment total number, a default fragment size, a multicast IP (Internet protocol), a data transmission port number and a remote station equipment list.
S2: and judging whether the terminal is in the remote station equipment list or not, if so, establishing multicast UDP connection with the central station based on the multicast IP and the data transmission port number.
S3: and receiving the fragmented data message sent by the central station through multicast UDP connection, wherein the sent fragmented data message is obtained by fragmenting the upgrade package file according to the default fragmentation size by the central station.
Specifically, the fragmented data packet carries a fragment sequence number, an effective data length, and transmission content.
S4: and receiving error correction signaling sent by the central station.
Specifically, the type of the error correction signaling is the error correction signaling for starting error correction.
Specifically, the error correction signaling is encapsulated by the central station, the error correction signaling includes an error correction signaling type, a remote station device list, and a slice to be error corrected, and the error correction signaling type includes start error correction, end error correction, and error correction data.
S5: and feeding back the information of the fragmented data messages needing to be retransmitted to the central station, wherein the information of the retransmitted fragmented data messages is the fragmented data messages which need to be received but are not received.
Collecting information of fragmented data messages needing to be retransmitted from a remote station establishing multicast UDP connection, wherein the retransmitted fragmented data messages are fragmented data messages which are fed back by the remote station through error correction signaling with the type of the error correction signaling being error correction data and need to be received but are not received;
s6: and after a preset time interval of 5s, receiving the retransmitted fragmented data message sent by the central station, and completing one-time error correction.
Specifically, the error correction signaling sent by the central station is received for a plurality of times, i.e., S4 to S6 are repeatedly executed for a plurality of times, such as 2 to 3 times.
S7: and after the error correction is completely finished, receiving an ending instruction sent by the central station, and ending the transmission.
After the transmission is finished, when an upgrading instruction sent by the central station is further received, upgrading is finished according to a received upgrading packet file, wherein the received upgrading packet file refers to a received fragmented data message set.
Example four
The present embodiment provides a multicast file receiving apparatus for upgrading satellite devices in batches, whose structural block diagram is shown in fig. 5, and includes a multicast protocol module disposed at each remote station, and each remote station and a central station are both located in a star-like satellite frequency division system network.
The working mode is explained as follows:
firstly, the multicast protocol module receives an open type signaling sent by a central station, wherein the open type signaling comprises a remote station equipment list, a multicast IP and a data transmission port number, and the open type signaling is obtained by packaging an upgrade packet file acquired by the central station according to the remote station equipment list needing to be upgraded.
Then, the multicast protocol module judges whether the multicast protocol module exists in the remote station equipment list, if so, the multicast protocol module establishes multicast UDP connection with the central station based on the multicast IP and the data transmission port number.
And then, the multicast protocol module receives the fragmented data message sent by the central station through multicast UDP connection, and the sent fragmented data message is obtained by fragmenting the upgrade packet file according to the default fragmentation size by the central station.
Then, the multicast protocol module receives an error correction signaling sent by the central station and feeds back fragmented data message information needing to be retransmitted to the central station, wherein the retransmitted fragmented data message information is a fragmented data message which needs to be received but is not received;
then, the multicast protocol module receives the retransmitted fragmented data message sent by the central station after a preset time interval;
then, the multicast protocol module receives an end instruction sent by the central station to end the transmission.
As a more detailed implementation manner, as shown in fig. 5, the multicast file receiving apparatus of this example further includes a signaling module provided at each remote station, and the signaling module is connected to the multicast protocol module.
The multicast protocol module feeds back the receiving result to the signaling module. After the multicast protocol module finishes receiving and transmitting the upgrade file packet, the signaling module responds to an upgrade instruction sent by the central station and executes the upgrade of the remote station equipment according to the upgrade file packet.
EXAMPLE five
This example provides a multicast file transmission method for upgrading satellite devices in batches, which is applied to a central station and a plurality of remote stations in a star-like satellite frequency division system network, and the flow of the method is shown in fig. 6, and includes the following steps:
firstly, the central station acquires an upgrade package file according to a remote station equipment list needing to be upgraded.
Specifically, the central station selects a plurality of remote station devices needing to be upgraded according to the central station of the user, responds to an upgrade execution instruction initiated by the user, generates and obtains a remote station device list needing to be upgraded, and obtains an upgrade package file according to the upgrade package list.
Then, the central station sends an open type signaling to each remote station, wherein the open type signaling comprises a file name, a file length, an md5 value, a total number of message fragments, a fragment size, a multicast IP, a data transmission port number and a device group. The default size of a slice is 512 Bytes.
Then, the remote station judges whether the remote station exists in the remote station equipment list or not according to the received open type signaling, if so, the remote station establishes multicast UDP connection with the central station based on the multicast IP and the data transmission port number.
And then, the central station fragments the upgrade package file according to the default fragment size and sends a fragment data message to the remote station establishing the multicast UDP connection. The fragment data message carries a fragment serial number, an effective data length and transmission content.
And then, the remote station receives the fragmented data message and ignores the fragmented data message which is repeatedly received.
Then, the central station sends error correction signaling after completing transmission of all the fragmented data messages.
Then, the remote station receives the error correction signaling, and feeds back the fragmented data message which needs to be received but not received to the central station as the information of the fragmented data message which needs to be retransmitted.
Then, after a predetermined time interval, the central station retransmits the fragmented data packet to be retransmitted.
The remote station then receives the retransmitted fragmented data message.
The central station then sends an end command.
And then, the remote station closes the multicast UDP connection according to the received ending instruction, and ends the transmission.
The central station then issues an upgrade order.
And then, the remote station upgrades according to the received upgrading instruction and the received fragment data message.
EXAMPLE six
The present embodiment provides a multicast file transmission apparatus for upgrading satellite devices in batches, which has a structure as shown in fig. 7, and includes: the system comprises a central signaling module and a central multicast protocol module which are arranged in a central station, and a remote multicast protocol module which is arranged in each remote station, wherein the central station and each remote station are in a star satellite frequency division system network.
The central signaling module is responsible for instructing the central multicast protocol module to initiate the transmission of the upgrade package file and for initiating the upgrade instruction. The central multicast protocol module is responsible for processing the upgrade package transmission instruction and completing the transmission of the upgrade package file. The remote multicast protocol module is responsible for receiving the upgrade package file and the remote signaling module is responsible for processing the upgrade instruction from the central station.
Remote upgrading of a plurality of remote station processing flows by a central station:
1. the user selects a plurality of remote station devices at the central station and executes the upgrade instructions.
2. The central signaling module informs the central multicast protocol module of the equipment needing to be upgraded and waits for the result.
3. After receiving the device list to be upgraded, the central multicast protocol module starts to transmit the upgrade packet to the remote station. And after the transmission is finished, returning the result to the central signaling module.
4. The central signaling module sends an upgrade instruction to the remote station.
5. And the remote signaling module receives the upgrading instruction to start upgrading and complete upgrading processing.
Specifically, in step 3 of this example, the specific working manner of the transmission of the upgrade package to the remote station may refer to the multicast file protocol transmission flow shown in fig. 8.
Regarding multicast file transfer protocol:
the transmission protocol is divided into a client program and a server program, the client program runs on each remote station device, and the server program runs on the central station device.
Protocol messages are divided into control signaling and data messages.
The control signaling includes on-type signaling, off-type signaling, and error correction signaling.
The open type signaling comprises a file name, a file length, an md5 value, a total number of message fragments, a fragment size, a multicast IP, a data transmission port number and a device group. The default size of a slice is 512 Bytes.
The ending type signaling comprises a file name, a file length, an md5 value, a multicast IP and a data transmission port number
And the error correction signaling comprises an error correction signaling type, a device group list and a to-be-error-corrected fragment. The error correction signaling types include start error correction, end error correction, and error correction data.
The fragment data message for transmission carries fragment sequence number, effective data length and transmission content
The transport protocol uses multicast IP 224.0.0.1, 8888 port number as transport management signaling by default. The client establishes a UDP connection using the 8888 port number and joins the multicast group 224.0.0.1.
And the method supports the setting of error correction times and the setting of multicast IP and port number used for data message transmission.
Multicast protocol message format:
based on this, referring to fig. 8, the transmission flow of this example is:
first, the central signaling module obtains a list of remote station devices that need to be upgraded.
Specifically, a plurality of remote station devices needing to be upgraded are selected at a central station according to a user, an upgrade execution instruction initiated by the user is responded, a list of the remote station devices needing to be upgraded is generated and obtained, and a file transmission instruction is sent to a central multicast protocol module.
Then, the central multicast protocol module obtains the file name, the file size, the file md5 value and the like according to the file transmission instruction and the remote station device list obtained by the central signaling module, obtains the upgrade package file, and calculates the total fragment.
Then, the central signaling module encapsulates the open type signaling according to the upgrade package file acquired by the central multicast protocol module.
The central multicast protocol module then sends the open type signaling to each remote station.
And then, the remote multicast protocol module receives the opening type signaling, judges whether the remote station where the remote multicast protocol module is located exists in the remote station equipment list, and if so, establishes multicast UDP connection with the central multicast protocol module based on the multicast IP and the data transmission port number. Generally, the setup can be performed after 2s waiting after the central multicast protocol module sends the start-up signaling.
Then, the central multicast protocol module fragments the upgrade package file according to the default fragment size, and sends a fragment data message to the far-end multicast protocol module which establishes the multicast UDP connection.
And then, the far-end multicast protocol module receives the fragmented data messages and ignores the fragmented data messages which are repeatedly received.
Then, the central multicast protocol module sends error correction signaling after completing transmission of all the fragmented data messages.
And executing multiple error correction processes according to the preset error correction times. Generally, the requirement of most links can be met for 2-3 times. The error correction process is as follows:
1) and after the central multicast protocol module finishes transmitting all the fragments, sending a starting type error correction signaling.
2) The far-end multicast protocol module receives the error correction signaling, and feeds back the fragmented data message which needs to be received but is not received to the central multicast protocol module by the fragmented data message information which needs to be retransmitted.
3) And the remote multicast protocol module receives the retransmitted fragmented data message.
4) After waiting for 5s, the central multicast protocol module retransmits the collected fragmented data message needing retransmission
5) And the remote multicast protocol module receives the retransmitted fragmented data message.
Then, the central multicast protocol module sends an end instruction.
Then, the far-end multicast protocol module receives the end instruction, closes the multicast UDP connection, ends the transmission, and feeds back the receiving result of the file to the far-end signaling module.
The central signaling module then sends an upgrade order to the remote station.
Then, the remote signaling module receives the upgrading instruction to start upgrading, and finishes upgrading processing.
The above is only a preferred embodiment of the present invention and is not intended to limit the present invention, and it is apparent that those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (10)
1. The method for sending the multicast file for upgrading the satellite equipment in batches is characterized by being applied to a central station and comprising the following steps of:
acquiring an upgrade package file according to a remote station equipment list needing to be upgraded;
sending an open type signaling to each remote station, wherein the open type signaling comprises a remote station equipment list, a multicast IP and a data transmission port number;
after a predetermined time interval, establishing a multicast UDP connection based on the multicast IP and the data transmission port number with the remote station existing in the remote station equipment list;
fragmenting the upgrade package file according to the default fragmentation size and then sending a fragmented data message to a remote station establishing multicast UDP connection;
after completing transmission of all the fragmented data messages, sending an error correction signaling to collect fragmented data message information needing to be retransmitted from a remote station establishing multicast UDP connection;
after a preset time interval, retransmitting the fragmented data message needing to be retransmitted;
and sending an ending instruction to end the transmission.
2. The method for sending the multicast file for the batch upgrading of the satellite equipment according to claim 1, wherein the method comprises the following steps:
calculating the total number of message fragments of the upgrade package file according to the default fragment size of the obtained upgrade package file, and packaging an open type signaling, an end type signaling and an error correction signaling;
the open type signaling comprises a file name, a file length, an md5 value, a message fragment total number, a default fragment size, a multicast IP (Internet protocol), a data transmission port number and a remote station equipment list;
the ending type signaling comprises a file name, a file length, an md5 value, a multicast IP and a data transmission port number;
the error correction signaling comprises an error correction signaling type, a remote station equipment list and a fragment to be error corrected, wherein the error correction signaling type comprises error correction starting data, error correction ending data and error correction data;
and after the upgrade package file is fragmented according to the default fragment size, the fragmented fragment data message carries the fragment serial number, the effective data length and the transmission content.
3. The method for sending the multicast file for the batch upgrading of the satellite equipment according to claim 2, wherein the method comprises the following steps:
after completing transmission of all the fragment data messages, executing error correction processing according to preset error correction times, wherein each error correction processing comprises the following steps:
sending error correction signaling with the type of the error correction signaling as error correction starting;
collecting information of fragmented data messages needing to be retransmitted from a remote station establishing multicast UDP connection, wherein the retransmitted fragmented data messages are fragmented data messages which are fed back by the remote station through error correction signaling with the type of the error correction signaling being error correction data and need to be received but are not received;
after a preset time interval, resending the fragmented data message needing to be retransmitted to finish one-time error correction;
after the preset error correction times are all completed, sending error correction signaling with the type of the error correction signaling as the error correction finishing, and finishing the error correction;
sending an ending type signaling to enable the remote station to close the multicast UDP connection and end the transmission;
and sending an upgrade instruction to enable the remote station to complete upgrade according to the received upgrade package file, wherein the received upgrade package file refers to the fragmented data message set received by the remote station.
4. The multicast file sending device for upgrading the satellite equipment in batches is characterized by comprising a signaling module and a multicast protocol module which are arranged in a central station, wherein the central station and a plurality of remote stations are positioned in a star-shaped satellite frequency division system network;
the signaling module is used for acquiring a remote station equipment list needing to be upgraded;
the multicast protocol module is used for acquiring an upgrade package file according to the remote station equipment list acquired by the signaling module;
the signaling module is used for packaging an open type signaling according to the upgrade packet file acquired by the multicast protocol module, wherein the open type signaling comprises a remote station equipment list, a multicast IP and a data transmission port number;
the multicast protocol module is used for sending the opening type signaling packaged by the signaling module to each remote station; and for establishing a multicast UDP connection based on the multicast IP and the data transfer port number with the remote station existing in the remote station device list after a predetermined time interval; and is used for fragmenting the upgrade package file according to the default fragmentation size and then sending a fragmented data message to a remote station establishing multicast UDP connection; and is used for sending error correction signaling after finishing all the fragmented data message transmission, so as to collect fragmented data message information needing retransmission from a remote station establishing multicast UDP connection; and is used for retransmitting the fragmented data message which needs to be retransmitted after a preset time interval; and is used for sending an end instruction to end the transmission.
5. The multicast file transmission apparatus for batch upgrading of satellite devices according to claim 4, wherein:
the signaling module is used for calculating the total number of message fragments of the upgrade package file according to the upgrade package file and the default fragment size, and packaging an open type signaling, a finish type signaling and an error correction signaling;
the open type signaling comprises a file name, a file length, an md5 value, a message fragment total number, a default fragment size, a multicast IP (Internet protocol), a data transmission port number and a remote station equipment list;
the ending type signaling comprises a file name, a file length, an md5 value, a multicast IP and a data transmission port number;
the error correction signaling comprises an error correction signaling type, a remote station equipment list and a fragment to be error corrected, wherein the error correction signaling type comprises error correction starting data, error correction ending data and error correction data;
and after the multicast protocol module fragments the upgrade package file according to the default fragment size, the fragmented fragment data message carries a fragment serial number, an effective data length and transmission content.
6. The multicast file transmission apparatus for batch upgrading of satellite devices according to claim 5, wherein:
the multicast protocol module is used for executing error correction processing according to preset error correction times after completing transmission of all the fragment data messages, wherein each error correction processing comprises the following steps:
sending error correction signaling with the type of the error correction signaling as error correction starting;
collecting information of fragmented data messages needing to be retransmitted from a remote station establishing multicast UDP connection, wherein the retransmitted fragmented data messages are fragmented data messages which are fed back by the remote station through error correction signaling with the type of the error correction signaling being error correction data and need to be received but are not received;
after a preset time interval, resending the fragmented data message needing to be retransmitted to finish one-time error correction;
the multicast protocol module is used for sending error correction signaling with the type of error correction signaling being the error correction finishing type after the preset error correction times are all completed, and finishing error correction; and is used for sending an ending type signaling after finishing error correction so as to enable the remote station to close the multicast UDP connection, finish the transmission and receive a receiving result fed back by the remote station;
and the signaling module is used for sending an upgrading instruction after the multicast protocol module finishes the transmission so as to enable the remote station to complete upgrading according to the received upgrading packet file, wherein the received upgrading packet file is the fragmented data message set received by the remote station.
7. The multicast file receiving method for upgrading satellite equipment in batches is characterized by being applied to a remote station and comprising the following steps of:
receiving an open type signaling sent by a central station, wherein the open type signaling comprises a remote station equipment list, a multicast IP and a data transmission port number, and the open type signaling is obtained by packaging an upgrade packet file acquired by the central station according to the remote station equipment list needing to be upgraded;
judging whether the terminal exists in a remote station equipment list or not, if so, establishing multicast UDP connection with a central station based on a multicast IP and a data transmission port number;
receiving a fragmented data message sent by a central station through multicast UDP connection, wherein the sent fragmented data message is obtained by fragmenting an upgrade packet file according to the default fragmentation size by the central station;
receiving an error correction signaling sent by a central station, and feeding back fragmented data message information needing to be retransmitted to the central station, wherein the retransmitted fragmented data message information is a fragmented data message which needs to be received but is not received;
after a preset time interval, receiving a retransmitted fragmented data message sent by a central station;
and receiving an ending instruction sent by the central station, and ending the transmission.
8. The multicast file receiving device for upgrading the satellite equipment in batches is characterized by comprising a multicast protocol module arranged on each remote station, wherein each remote station and a central station are positioned in a star-shaped satellite frequency division system network;
the system comprises a multicast protocol module, a central station and a multicast server, wherein the multicast protocol module is used for receiving an open type signaling sent by the central station, the open type signaling comprises a remote station equipment list, a multicast IP and a data transmission port number, and the open type signaling is obtained by packaging an upgrade packet file acquired by the central station according to the remote station equipment list needing to be upgraded;
and is used for judging whether the terminal station exists in the remote station equipment list, if so, the terminal station establishes multicast UDP connection with the central station based on the multicast IP and the data transmission port number;
the system is used for receiving the fragmented data message sent by the central station through multicast UDP connection, and the sent fragmented data message is obtained by fragmenting the upgrade packet file according to the default fragmentation size by the central station;
the system comprises a central station, a data transmission unit and a data transmission unit, wherein the data transmission unit is used for receiving an error correction signaling sent by the central station and feeding back fragmented data message information needing to be retransmitted to the central station, and the retransmitted fragmented data message information is a fragmented data message needing to be received but not received;
the central station is used for receiving the retransmitted fragmented data message sent by the central station after a preset time interval;
and is used for receiving an end instruction sent by the central station to end the transmission.
9. The multicast file transmission method for upgrading satellite equipment in batches is characterized by being applied to a central station and a plurality of remote stations which are in a star-shaped satellite frequency division system network, and comprising the following steps of:
the central station acquires an upgrade package file according to a remote station equipment list needing to be upgraded;
the central station sends an open type signaling to each remote station, wherein the open type signaling comprises a remote station equipment list, a multicast IP and a data transmission port number;
the remote station judges whether the remote station exists in a remote station equipment list or not according to the received opening type signaling, and if the remote station exists, the remote station establishes multicast UDP connection with the central station based on the multicast IP and the data transmission port number;
the central station fragments the upgrade package file according to the default fragment size and sends a fragmented data message to a remote station establishing multicast UDP connection;
the remote station receives the fragmented data message and ignores the fragmented data message which is repeatedly received;
after completing transmission of all the fragment data messages, the central station sends error correction signaling;
the remote station receives the error correction signaling, and feeds back the fragmented data message which needs to be received but is not received to the central station by the fragmented data message information which needs to be retransmitted;
after a preset time interval, the central station retransmits the fragmented data message to be retransmitted;
the remote station receives the retransmitted fragmented data message;
the central station sends an ending instruction;
and the remote station closes the multicast UDP connection according to the received finishing instruction, and finishes the transmission.
10. A multicast file transmission device for upgrading satellite equipment in batches, its characterized in that includes: the system comprises a central signaling module and a central multicast protocol module which are arranged in a central station, and a remote multicast protocol module which is arranged in each remote station, wherein the central station and each remote station are in a star satellite frequency division system network;
the central signaling module is used for acquiring a remote station equipment list needing to be upgraded;
the central multicast protocol module is used for acquiring an upgrade package file according to the remote station equipment list acquired by the central signaling module;
the central signaling module is used for packaging an open type signaling according to the upgrade packet file acquired by the central multicast protocol module, wherein the open type signaling comprises a remote station equipment list, a multicast IP and a data transmission port number;
the central multicast protocol module is used for sending the open type signaling to each remote station;
the remote multicast protocol module is used for receiving the open type signaling and judging whether a remote station where the remote station is located exists in a remote station equipment list or not, if so, the remote multicast protocol module establishes multicast UDP connection with the central multicast protocol module based on the multicast IP and the data transmission port number;
the central multicast protocol module is used for fragmenting the upgrade package file according to the default fragment size and sending a fragmented data message to the far-end multicast protocol module which establishes the multicast UDP connection;
the far-end multicast protocol module is used for receiving the fragmented data messages and neglecting the fragmented data messages which are repeatedly received;
the central multicast protocol module is used for sending error correction signaling after completing transmission of all the fragmented data messages;
the far-end multicast protocol module is used for receiving the error correction signaling and feeding the fragmented data messages which need to be received but are not received back to the central multicast protocol module by the fragmented data message information which needs to be retransmitted;
the central multicast protocol module is used for retransmitting the fragmented data messages needing to be retransmitted after a preset time interval;
the remote multicast protocol module is used for receiving the retransmitted fragmented data message;
the central multicast protocol module is used for sending an ending instruction;
and the remote multicast protocol module is used for receiving the ending instruction, closing the multicast UDP connection and ending the transmission.
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