Unable to receive request on CoAP server running on Border Router.

[Mohinish]

Hi Nordic,

I am working on a raspberry pi based gateway which has Thread Border Router and edge node functionality. I have setup the OTBR on the gateway and I have manage to ping and send messages the thread nodes from the gateway.

Now I am trying to run a CoAP server on my gateway so that thread nodes can send messages to gateway. I have tried running a simple CoAP server on the gateway but its not able to receive any message whenever nodes sends request on the path.

I have attached the CoAP server code below. Please let me know if I am doing anything wrong.

libcoap-minimal.zip

[Sigurd Hellesvik]

Hi Mohinish,

Are you able to send messages to the CoAP server using the CoAP client running on the Raspberry Pi?

From you server.cc file, it looks like your server is hosted on the "localhost" port. Localhost is a loopback address, and can not be reached from external devices, such as your thread nodes.

To reach the Thread server from your nodes, you need to set the server up on an IP address belonging to the Raspberry Pi.

Did this fix your issue?

Regards,
Sigurd Hellesvik

[Mohinish]

Hi Sigurd,

I had to setup the server to listen for all incoming ipv6 address which is done by specifying "::" address.

Also, I would like to know which CoAP library does open-thread stack use internally. Is libcoap library is best fit for adding CoAP client server on the Thread Border Router with Edge Node functionality. Is there any library provided in open-thread implementation.

Regards

Mohinish Naik

[Sigurd Hellesvik]

Hi

OpenThread devices uses their own CoAP implementation.

You should be able to use any CoAP library for your CoAP server on the Gateway.

Regards,
Sigurd Hellesvik