Class-C sample



  • Dear all,

    we've got our RG1xx Gateway up and running - pretty awesome and easy experience

    We can already do the basic Class-A communication where the node creates an uplink msg to received a possible downlink msg.
    For our use case we want to be in "always listen mode", and I guess this is Class-C. Therefore I changed the example source accordingly to Class-C initialization:

    lora = LoRa(mode=LoRa.LORAWAN, public=True, tx_retries=3, device_class=LoRa.CLASS_C)
    
    s = socket.socket(socket.AF_LORA, socket.SOCK_RAW)
    s.setsockopt(socket.SOL_LORA, socket.SO_DR, 5)
    s.setsockopt(socket.SOL_LORA, socket.SO_CONFIRMED, False)
    s.setblocking(False)
    

    But... how do I proceed with receiving the messages? Eg for receiving only one test byte my infinite loop simply looks like this:

    while True:
        rx, port = s.recvfrom(1)
    

    But nothing is received

    Is there any sample for the Class-C mode?



  • Can any of those who have now successfully got class C downlinks working please share some example code? I've been at this all week and like many others here: I can get downlinks in class A or C in the RX window after sending but never outside of it.

    I'm also interested in some comments on how best to handle downlink messages, I can see some info on defining event driven callbacks but the docs don't make it clear whether this is supposed to be used for both LoRa and LoRaWAN. Otherwise I guess you'd just stop the socket from blocking and try to receive on that socket as part of a main loop, this seems a little messy but I'd just be happy to have it working.



  • yeah I tried @jmarcelino port option while you were writing @Neuromystix , setting port and works ;-)

    24/05/2018 16:59:16 Downlink: {"devaddr":"03128BC8","data":"0164","port":2, "time":"immediately"}
    

    Lopy Side

    Downlink received
    Cmd=0x01
    Value=100% Dac1=0.8
    

    thanks all :-)



  • @charly86 You'll need to specify also a port number for class C to work:

    {"devaddr":"03128BC8","data":"0100", "port":2, "time":"immediately"}
    


  • @jmarcelino I'm using websocket for that, and with json, for class A I'm sending this and got downlink just after uplink (it works also with class C)

    24/05/2018 16:16:11 Downlink: {"devaddr":"03128BC8","data":"0100"}
    

    but for class C, when I send this nothing happens, even sending uplink just after to try to get downlink

    24/05/2018 16:15:32 Downlink: {"devaddr":"03128BC8","data":"0100","time":"immediately"}
    

    Anyway I'll try A timed one, may be I'm not doing things correctly



  • @charly86
    Thanks, for the Gotthard server how are you triggering the Class C downlink? Are you specifying the correct port and time?



  • @jmarcelino
    Thanks, I'm using this one https://github.com/gotthardp/lorawan-server with this configuration

    0_1527172340709_e07f1c70-7c5e-437c-b0b6-ef727111e257-image.png



  • Hi @charly86

    It should be. What's your network server? Is it sending the downlink on RX2 correctly, do you know which frequency/sf it is using?



  • Hi guys
    have you got an example of class C device working?
    I've done several tests and got only downlink when I send an uplink.

    Is class C is working (I got last firmware at this day)
    Thanks



  • Hello all,

    Forget it, it's working fine here. Received downlink data in 869,525 and with any DR. Bad server configuration was the problem.

    I have the same problem here. I'm running locally a Lorawan Server and i can send up or downlink messages in Class-A mode without any problem. When trying to use Class-C i never receive nothing. I know that the server send the message, because i use a SDR to confirm it.
    My test code is:

    #Class C test code
    lora = LoRa(mode=LoRa.LORAWAN, region=LoRa.EU868, public=True, device_class=LoRa.CLASS_C)
    lora_channel_init()
    lora.join(activation=LoRa.OTAA, auth=(app_eui, app_key), timeout=config.JOIN_TIMEOUT, dr=config.JOIN_DR)
    print('Not joined yet...')
    while not lora.has_joined():
        blink(red, 0.5, 1)
    print('  ---  Joined Sucessfully  ---  ')
    
    s = socket.socket(socket.AF_LORA, socket.SOCK_RAW)
    s.setsockopt(socket.SOL_LORA, socket.SO_DR, config.LORA_NODE_DR)
    s.setsockopt(socket.SOL_LORA, socket.SO_CONFIRMED, config.LORA_NODE_CONFIRMED)
    s.setblocking(False)
    
    while True:
        rx, port = s.recvfrom(12)
        if rx:
            print('Received: {}, on port: {}'.format(rx, port))
            #blink(yellow, 0.1, 2)
    
    

    The code configure three channels in 868,1 and then join the network. When inside the loop, it never receive nothing.

    Channel 0 in frequency 868100000
    Channel 1 in frequency 868100000
    Channel 2 in frequency 868100000
    Not joined yet...
      ---  Joined Sucessfully  ---
    
    

    If i change the code and insert a send inside the loop, when trying to downlink a message to Lopy, it receives it inside the RX1 window normally but never outside of it.

    pkt_send = 0
    while True:
        s.setblocking(True)
        s.send(bytes([0x00,0x01]))
        s.setblocking(False)
        rx, port = s.recvfrom(12)
        if rx:
            print('Received: {}, on port: {}'.format(rx, port))
            #blink(yellow, 0.1, 2)
        time.sleep(5)
    

    Next image shows a downlink message sended in normal class A style, using RX1 windows.
    0_1518800245134_SendingClsA.jpg

    Here i tried to send multiple downlinks outside RX window time but Lopy never received none.
    0_1518800216855_SendingClsA2.jpg

    Any idea how to solve it or what could be wrong? Did Lopy use the default LoraWAN RX2 frequency and DR??



  • @jmarcelino yes, that was the problem :) thx



  • Hi @derchris

    You still need to join the network with lora.join(activation=... , auth=(...)) as you do in Class A even for Class C.

    Perhaps that's the problem?

    If not please tell me more about your setup, which network server are you using etc.

    Thanks.


 

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