emqx_coap_api { content_type.desc: """Payload type""" message_id.desc: """Message ID""" method.desc: """Request method type""" payload.desc: """The content of the payload""" response_code.desc: """Response code""" send_coap_request.desc: """Send a CoAP request message to the client""" timeout.desc: """Timespan for response""" token.desc: """Message token, can be empty""" }