gcoap/forward_proxy: handle timeout case #20915
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Type: bug
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Contribution description
Handle when the CoAP forward proxy is not getting a response from the remote server, by sending a RST message to the client, so it will not wait further for a response.
Testing procedure
We used nanocoap client and the proxy without uplink connection. So the request will timeout and the client will get a RST.
Issues/PRs references
#20910