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==Communication protocol==
==Close a session command (CMD ID 0x0000)==
'''Close a session command (CMD ID 0x0000)'''<br>
In case when a device connects to a server, but the server does not expect it to connect, server will respond by sending a CLOSE command after which the connection will be terminated. This command is also used when device connects to a server for a custom file sending and server finishes to send all custom files to the device.
In case when a device connects to a server, but the server does not expect it to connect, server will respond by sending a CLOSE command after which the connection will be terminated. This command is also used when device connects to a server for a custom file sending and server finishes to send all custom files to the device.
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'''Start file transfer command (CMD ID 0x0001)'''<br>
After device is connected for a file download, server initiates file transfer by sending a START command.
After device is connected for a file download, server initiates file transfer by sending a START command.
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'''File request command (CMD ID 0x0008)'''<br>
After device is connected for a file upload, server initiates file transfer by sending a FILE REQ command.
After device is connected for a file upload, server initiates file transfer by sending a FILE REQ command.
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'''Resume file transfer command (CMD ID 0x0002)'''<br>
In a response to the START command a RESUME command must be sent from a server.
In a response to the START command a RESUME command must be sent from a server.
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'''Synchronize file transfer command (CMD ID 0x0003)'''<br>
In a response to the RESUME command a SYNC command is sent from device.
In a response to the RESUME command a SYNC command is sent from device.
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'''File data transfer command (CMD ID 0x0004)'''<br>
After sending a SYNC command, a file data transfer is started by sending DATA commands.
After sending a SYNC command, a file data transfer is started by sending DATA commands.
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'''File transfer status command (CMD ID 0x0005)'''<br>
After a file transfer is completed and no more files are required from the device, a server should send a COMPLETED command to the device (this command does not work after executing repeat init command0 x0009 – in this case the server should send a CLOSE session 0x0000 command mentioned before).
After a file transfer is completed and no more files are required from the device, a server should send a COMPLETED command to the device (this command does not work after executing repeat init command0 x0009 – in this case the server should send a CLOSE session 0x0000 command mentioned before).
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