Thingsquare MQTT Multiple Node

Bontor Humala

Other Parts Discussed in Thread: CC2538

Hello guys. I am trying to connect multiple 6lowPAN nodes to an MQTT server (m2m.eclipse.org). I use router-webserver-node and mqtt-example example code, on OpenMote board (CC2538). I followed tutorials from:

1. http://processors.wiki.ti.com/index.php/China_IOT_Contest_Thingsquare_6LoWPAN

2. http://processors.wiki.ti.com/index.php/Thingsquare_6LoWPAN_MSP430

and managed to send data, using 1 node. When add more node, the older node would lose connection. Practically, I can only use 1 node in my network, while the examples suggest that it would work with multiple nodes.

I trace the log, and found out the error came from tcp_event callback in mqtt.c, I got TCP_SOCKET_CLOSED. I trace again to tcp-socket.c and it came from an appcallback, which my app got uip_closed() returning true.

Anybody have same experience? I tried to match the contiki-conf and platform-conf to configurations used in both example link, still no improvement. Thank you guys.

over 11 years ago

0 Firefighter over 11 years ago

TI__Genius 12480 points

Hi,

Please also look at this wiki, there is a simple MQTT example that has been tested with multiple devices connected. http://processors.wiki.ti.com/index.php/Contiki-6LOWPAN#MQTT_Demo_Application

Two things to consider regarding your issue;

Once your device registers with the MQTT broker it need to use a unique device ID. It is set using this function mqtt_register(&conn, &mqtt_example_process, "tiot_client", mqtt_event);
Your device need to have a unique MAC (EUI-64) address programmed. Make sure that is the case. You can use SmartRF Programmer to read the MAC address of your CC2538 device.

Thanks,

Jonas

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Thingsquare MQTT Multiple Node