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Thanks. In our use case, FMC640 receives data from an external device over RS232 port, then send this data to our server via UDP. Is CMD ID 6 correct? 

Codec 12 protocol describes the establishing the link with a server using IMEI  and ACK. I guess that is only for TCP protocol. Will it also apply to UDP? What is the structure if it also apply to UDP?

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You can use RS232 data forwarding with UDP or TCP protocol.

CMD ID default value is 6, but you can configure it within range 1-6 and 11-14

Note! CMD ID set in device must be increased by 1 than the one that is sent from server. For example. If CMD ID in device is set ot 8, server should send codec 12 string with CMD ID 7.