Reading asynchonously received packet on mDot (classC)

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  • May 15, 2017 at 2:15 pm #19056
    Steeve Zissou
    Participant

    Dear All,

    I’d like my mDot to receive data from the gateway. I was able to do this with the function send() and recv(). Now I want to be able to receive data asynchronously, using classC capabilities.

    I have studied the example “CLASS_C_EXAMPLE” from Multitech’s Dot-Example, but I can’t find a way to access the received packets’ payload.

    Could someone show me a code to read the received packet (send by gateway to a classC configured mDot).

    Thank you !

    Steeve

    May 15, 2017 at 7:17 pm #19060
    Jason Reiss
    Keymaster

    Look at inc/RadioEvent.h in the Dot-Examples project.

    May 18, 2017 at 2:22 am #19150
    Momo Smith
    Participant

    Hello guys,

    I have seen the code in inc/RadioEvent.h.

    I call RadioEvent(); just after the code to join a network.
    In result, i don’t have a data in my console.

    According to you, what is the problem ? or, what is missed in the main code CLASS_C_EXAMPLE for working correctly ?

    Thank You.

    • This reply was modified 7 years, 10 months ago by Momo Smith.
    • This reply was modified 7 years, 10 months ago by Momo Smith.
    May 18, 2017 at 7:56 am #19155
    Mike Fiore
    Blocked

    Momo,

    Your application should not be calling RadioEvent. It will be triggered by the Dot Library when events happen. If you set everything up, the Class C Example from Dot-Examples should work.

    https://developer.mbed.org/teams/MultiTech/code/Dot-Examples/

    There needs to be something on the gateway side that is actually sending data to your device. We have some examples of how to do this on our developer site.

    Conduit mPower: LoRa Communication and Node-RED

    Conduit mLinux: LoRa Communication

    Cheers,
    Mike

    May 18, 2017 at 8:48 am #19161
    Momo Smith
    Participant

    Hi Mike, thanks for your response.

    On my conduit, i created a inject button, a fonction and a output Lora.
    In my fonction, i use eui node and payload “hello”.
    On my node i use the class_c_exemple.cpp. I can see the message payload on the console (putty), but why need to send a dummy message before to receive my payload ?
    I thought the node was always in receive when it is in class_C. Maybe i am wrong ?

    If i comment the code ( class_c_exemple.cpp) between “#if defined(TARGET_XDOT_L151CC)” and “endif”, i can’t receive my payload. Why ?

    May 18, 2017 at 8:55 am #19163
    Mike Fiore
    Blocked

    Momo,

    Did you update the node to class C on your network server after it joined? You need to use lora-query to do this. That step is documented in the Class C example program.

    Your node is in class C mode, but the network server needs to be informed of this and there is currently no LoRa message in the standard for that purpose. It must be an Out Of Band (OOB) message at this point.

    Cheers,
    Mike

    May 18, 2017 at 10:17 am #19164
    Momo Smith
    Participant

    To response at the last message Mike,
    Your information is correct. My server isn’t in class C. I modify my configuration.
    Thanks.

    So I have a other question.
    I wish used one node in class_A to send a message for my server and an other node in class_c to receive this message from server.

    Mike, you think what this configuration is possible ?

    Thank you for your time and involvement.

    May 18, 2017 at 10:36 am #19166
    Mike Fiore
    Blocked

    Your application would need to handle that scenario. There is no support in the Network Server for routing messages between nodes.

    Cheers,
    Mike

    May 19, 2017 at 3:00 am #19215
    Momo Smith
    Participant

    Hi Mike,
    I have configure my server today.
    My program working now. Thank you.

    May 19, 2017 at 9:09 am #19222
    Momo Smith
    Participant

    Hello friends,

    Now, my node is in class C. I can see each data in a console. I would like to retreive data for send it with a UART connexion. I read a differents functions in file mDot.h. There is just one function to receive named recv(). In comment, it’s note “send() must be called before recv()”
    So, my question is :
    What is the good fonction i need to use for receive each datas in real time without use send() before ?

    Thank

    May 22, 2017 at 8:19 am #19238
    Jason Reiss
    Keymaster

    You will want to accept the received packets in the event handler

    examples/inc/RadioEvent.h

    Add your code to the MacEvent function.

    RadioEvent::MacEvent(LoRaMacEventFlags* flags, LoRaMacEventInfo* info);

    if (flags->Bits.Rx) {           
      logDebug("Rx %d bytes", info->RxBufferSize);
      if (info->RxBufferSize > 0) {
          // print RX data as hexadecimal
          //printf("Rx data: %s\r\n", mts::Text::bin2hexString(info->RxBuffer, info->RxBufferSize).c_str());
 
          // print RX data as string
          std::string rx((const char*)info->RxBuffer, info->RxBufferSize);
          printf("Rx data: %s\r\n", rx.c_str());

          // TODO: output to UART
      }
}
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