Hi,
I want to set up a simple setup of two posix projects -- one running a simple coap server and other running a simple coap client.

What I did so far:

1) I build both  /zephyrproject/zephyr/samples/net/sockets/coap_client and zephyrproject/zephyr/samples/net/sockets/coap_server without any changes.



2) I executed ./net-setup.sh. With sudo ifconfig I can see the new zeth interface:
zeth: flags=4099<UP,BROADCAST,MULTICAST>  mtu 1500
        inet 192.0.2.2  netmask 255.255.255.0  broadcast 0.0.0.0
        inet6 2001:db8::2  prefixlen 128  scopeid 0x0<global>
        ether 00:00:5e:00:53:ff  txqueuelen 1000  (Ethernet)
        RX packets 0  bytes 0 (0.0 B)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 0  bytes 0 (0.0 B)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0



3) I started the coap server posix program and tested it by sending a get request to the core1 resource (I used the coap-cli tool https://www.npmjs.com/package/coap-cli):

coap get coap://[2001:db8::1]/core1

to which the server replied with:

(2.05)    Just a test

So the server works as expected. In addition I used wireshark sniffing on the zeth interface --> The CoAP get request and the response was there.



4)I started the client -- on the consol I see:

 ***** Booting Zephyr OS build v2.0.0-rc2 *****

CoAP client GET

but I cannot see any packets send in wireshark. I think something is not properly configured probably the zeth interface?

How to test the coap_client sample when running it as a posix application?

Best regards,
Stefan