Install libcoap-1-0-doc by entering the following commands in the terminal:
sudo apt update sudo apt install libcoap-1-0-doc
Description:
C-Implementation of CoAP - HTML based documentation files
Lightweight application-protocol for devices that are constrained their resources such as computing power, RF range, memory, bandwidth, or network packet sizes. This protocol, CoAP, is developed in the IETF working group "CoRE",
Homepage: https://libcoap.net/
Version: 4.1.2-1
Section: universe/doc