Crash when using python aiocoap

[sheosi]

I'm experimenting and when this as a server and Python's aiocoap as a client I get a crash:

thread 'main' panicked at 'index out of bounds: the len is 0 but the index is 0', /home/sergio/.cargo/registry/src/github.com-1ecc6299db9ec823/coap-0.11.3/src/observer.rs:85:59

import asyncio
from aiocoap import *

async def main():
    protocol = await Context.create_client_context()

    request = Message(code=GET, uri='coap://127.0.0.1:5683/hello/put', observe=0)

    pr = protocol.request(request)

    r = await pr.response
    print("First response: %s\n%r"%(r, r.payload))

if __name__ == "__main__":
    asyncio.run(main())

Changing the "observe" flag to something other than 0 doesn't crash, however, the resource is not observed.

EDIT: On second thought this looks more like an issue in coap-lite isn't it?

[sheosi]

Using version from git and updating to coap-litefixed the crash.

[wuyingfengsui]

I will use the latest coap-lite in the next release.