nRF9160: Failed to send CoAP messages (PUT method)

RE: nRF9160: Failed to send CoAP messages (PUT method)

Achim Kraus — Mon, 01 Nov 2021 10:03:36 GMT

Just to mention:

Californium runs also on cloud VMs (droplets) or cloud-k8s deployments. It requires mainly java to be installed ahead (see https://github.com/eclipse/californium/wiki/Californium-as-old-style-unix-systemd-service ). Sometimes the missing UDP support for some network components (e.g. load-balancers) requires some work-around, but UDP is getting better and better supported.

Californium support blockwise (RFC7959) also for long time. A simple file-server using that is also available in the demo-apps, https://github.com/eclipse/californium/tree/master/demo-apps/cf-simplefile-server.

RE: nRF9160: Failed to send CoAP messages (PUT method)

tkeilbach — Sat, 30 Oct 2021 06:46:40 GMT

Hi Cedric,

for californium server I just use Nordics coap sample without changing anything to test if my custom board is working. For my more complex test (blockwise transfer) I did not used the californium server. I had built a custom made coap server (libcoap) which ran on Digital Ocean Droplet at the time.

This gave me the possibility to snif and validate every single byte which the coap server receives form the coap client (by using "tcp dump" to record the data stream at the coap server port and analyze it afterwards with wireshark).

RE: nRF9160: Failed to send CoAP messages (PUT method)

ced27 — Fri, 29 Oct 2021 14:00:32 GMT

Hallo tkeilbach,

Can you please tell me how you manage to send CoAP messages to californium server?

BR,

Cedric

RE: nRF9160: Failed to send CoAP messages (PUT method)

tkeilbach — Tue, 20 Jul 2021 13:53:31 GMT

Topic solved:

Problem or missunderstand is the coap_packet_append_option() function. This function can not handle a complete string block like "mqtt/batterytest".
If the string is splitted into two function calls where you first put "mqtt" and then "batterytest" to the function, it works.
Same for the uri_query.

RE: nRF9160: Failed to send CoAP messages (PUT method)

tkeilbach — Tue, 20 Jul 2021 10:33:11 GMT

Just an update: The original coap-client example works as expacted (server "californium.eclipseprojects.io" with resource "obs").
So any problems regarding the sim card, mobile connection, signal strange, traffic limits etc can be excluded!