G01 + LTE communication problems

  • Using Pycom MicroPython 1.20.0.rc13 [v1.9.4-94bb382] on 2019-08-22 and LTE modem UE6.0.0.0, LR6.0.0.0-41019

    We built a small test environment for testing communication on NB-IoT network. A small py script sending a few bytes to an echo server over UDP socket. The script sends subsequent integer number as 1, 2, 3, ... and it waits for replay from the echo server for 1 second. When we perform cold start, the modem manages to exchange from 6 to 65 packets.

    The packets arrive always sequentially. We do not observe any packet drop. However, when the modem stops receiving packets, the communication is stopped. We never observe sequences such as 1, 2, 3, 10, 11, and so on. There is no error message, no debug. Nothing. When we reset system with the RESET line and try to send again, we still do not get any data transmitted. The communication can be only returned by cutting power off the board. Then the modem sends again a few packets.

    I manage to resume communication by executing LTE modem function deinit(reset = True). Nonetheless, this does not fix the problem of broken connection.

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