aiocoap-client is a simple command-line tool for interacting with CoAP servers

usage: aiocoap-client [-h] [-m METHOD] [--observe] [--observe-exec CMD]
                      [--accept MIME] [--proxy HOST[:PORT]] [--payload X]
                      [--content-format MIME] [-v] [-q] [--dump FILE]
Required Arguments
url CoAP address to fetch
Optional Arguments
-m="GET", --method="GET"
 Name or number of request method to use (default: “GET”)
 Register an observation on the resource
--observe-exec Run the specified program whenever the observed resource changes, feeding the response data to its stdin
--accept Content format to request
--proxy Relay the CoAP request to a proxy for execution
--payload Send X as payload in POST or PUT requests. If X starts with an ‘@’, its remainder is treated as a file name and read from.
 Content format sent via POST or PUT
-v, --verbose Increase the debug output
-q, --quiet Decrease the debug output
--dump Log network traffic to FILE
 Enter interactive mode