CoAP client

Overview

This sample is a simple CoAP client showing how to retrieve information from a resource.

This demo assumes that the platform of choice has networking support, some adjustments to the configuration may be needed.

This sample will make a GET request with path ‘test’ to the IPv6 multicast address reserved for CoAP nodes, so the URI can be represented as:

coap://[ff02::fd]:5683/test

Building and Running

This project will print all the octets of the response received, more context can be obtained by using a tool such as tcpdump or wireshark.

See the net-tools project for more details.

This sample can be built and executed on QEMU as described in Networking with QEMU.

Sample output

reply: 60 00 00 00 00 24 11 40 fe 80 00 00 00 00 00 00 5c 25 e2 ff fe
15 01 01 fe 80 00 00 00 00 00 00 5c 25 e2 ff fe 15 01 01 16 33 16 33
00 24 3d 86 60 40 00 01 ff 54 79 70 65 3a 20 30 0a 43 6f 64 65 3a 20
31 0a 4d 49 44 3a 20 31 0a (76 bytes)