MQTT Gateway - works, pings but no messages while listening to broker



  • Hi!

    I'm having hard time setting up MQTT ethernet gateway. My gateway is set up on 10.0.35:

    magdalena@magdalena-laptop:~$ ping 10.0.0.35
    PING 10.0.0.35 (10.0.0.35) 56(84) bytes of data.
    64 bytes from 10.0.0.35: icmp_seq=1 ttl=128 time=0.236 ms
    ^C
    --- 10.0.0.35 ping statistics ---
    1 packets transmitted, 1 received, 0% packet loss, time 0ms
    rtt min/avg/max/mdev = 0.236/0.236/0.236/0.000 ms
    

    I can connect with mosquitto_sub:

    magdalena@magdalena-laptop:~$ mosquitto_sub -h 10.0.0.35 -d -t 'MyMQTT/#'
    Received CONNACK
    Received SUBACK
    Subscribed (mid: 1): 0
    Sending PINGREQ
    Received PINGRESP
    

    On the serial console on gateway I have:

    Started!
    0;0;3;0;9;read: 20-20-0 s=255,c=3,t=11,pt=0,l=18:Temperature Sensor
    0;0;3;0;9;read: 20-20-0 s=255,c=3,t=12,pt=0,l=3:1.0
    0;0;3;0;9;read: 20-20-0 s=255,c=0,t=17,pt=0,l=5:1.4.1
    

    ^^^ this is my temperature sensor showing

    0;0;3;0;9;read: 20-20-0 s=255,c=3,t=6,pt=1,l=1:0
    0;0;3;0;9;read: 20-20-0 s=255,c=3,t=11,pt=0,l=18:Temperature Sensor
    0;0;3;0;9;read: 20-20-0 s=255,c=3,t=12,pt=0,l=3:1.0
    

    ^^^ I restarted the sensor node.

    <<10 24 00 06 4D 51 49 73 64 70 03 02 00 3C 00 16 6D 6F 73 71 5F 73 75 62 5F 35 38 37 37 5F 6D 61 67 64 61 6C 65 6E 
    >>20 02 00 00 
    <<82 06 00 01 00 01 23 00 
    >>90 03 00 01 00
    

    ^^^ sometimes I get something like this (what is it?)

    0;0;3;0;9;read: 20-20-0 s=255,c=0,t=17,pt=0,l=5:1.4.1
    0;0;3;0;9;read: 20-20-0 s=255,c=3,t=6,pt=1,l=1:0
    0;0;3;0;9;send: 0-0-20-20 s=255,c=3,t=6,pt=0,l=1,st=ok:M
    0;0;3;0;9;read: 20-20-0 s=255,c=3,t=11,pt=0,l=18:Temperature Sensor
    0;0;3;0;9;read: 20-20-0 s=255,c=3,t=12,pt=0,l=3:1.0
    <<C0 00 
    >>D0 00 
    <<C0 00 
    >>D0 00 
    <<C0 00 
    >>D0 00 
    

    ^^^ some more garbage.

    I'm using:

    Arduino Uno (GW)
    Ethernet Shield on W5100

    Arduino Pro mini 3,3V

    NRF24L01 Radios. SoftSPI enabled.

    So the problem is that I do not get anything with mosquittp_sub. What is wrong?

    PS. I did not connect decoupling capacitor. Gateway and sensor are laying 5cm besides each other.



  • OK, I've probably fixed it 🙂

    It was bad connection on Dallas sensor so sensor node did not send any data and that was why I did not receive any 🙂

    But what is this garbage on the serial?
    0;0;3;0;9;read: 20-20-0 s=255,c=0,t=17,pt=0,l=5:1.4.1
    0;0;3;0;9;read: 20-20-0 s=255,c=3,t=6,pt=1,l=1:0
    0;0;3;0;9;send: 0-0-20-20 s=255,c=3,t=6,pt=0,l=1,st=ok:M
    0;0;3;0;9;read: 20-20-0 s=255,c=3,t=11,pt=0,l=18:Temperature Sensor
    0;0;3;0;9;read: 20-20-0 s=255,c=3,t=12,pt=0,l=3:1.0
    0;0;3;0;9;read: 20-20-0 s=0,c=0,t=6,pt=0,l=5:1.4.1
    0;0;3;0;9;read: 20-20-0 s=0,c=1,t=0,pt=7,l=5:24.6
    MyMQTT/20/0/V_TEMP
    >>30 18 00 12 4D 79 4D 51 54 54 2F 32 30 2F 30 2F 56 5F 54 45 4D 50 32 34 2E 36
    <<C0 00
    >>D0 00


  • Hero Member

    <<C0 00 
    >>D0 00
    

    is a MQTT hartbeat

    The 0;0;3;0;9 are gateway log messages.



  • @cayco Those lines are just the data that is being received/transmitted through the Ethernet module and its showing as HEX.
    If you convert the hex to ascii you can see what it is..

    In your example you are getting: "**$MQIsdp<mosq_sub_5877_magdalen**"

    Here is a good tool: http://www.asciitohex.com/


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