aiocoap – The Python CoAP library

The aiocoap package is a Python implementation of CoAP, the Constrained Application Protocol (RFC 7252, more info at

It uses the asyncio module introduced in Python 3.4 to facilitate concurrent operations while maintaining a simple to use interface and not depending on anything outside the standard library.

aiocoap is originally based on txThings. If you want to use CoAP in your existing twisted application, or can not migrate to Python 3 yet, that is probably more useful to you than aiocoap.


For details on how to use the aiocoap library, have a look at the aiocoap module documentation, or at the Usage Examples and CoAP tools provided.

All examples can be run directly from a source code copy. If you prefer to install it, the usual Python mechanisms apply.


The core aiocoap functionality works out of the box with Python 3.4; with the additional asyncio module, it works with version 3.3 as well.

When application/link-format typed resources (RFC 6690) are supposed to be used, the link_header module is required as well. When the respective code paths are used without the module, an ImportError will be raised, or a 5.00 status code will be returned.


aiocoap tries to stay close to PEP8 recommendations and general best practice, and should thus be easy to contribute to. Unit tests are implemented in the ./tests/ directory; complete test coverage is aimed for, but not yet complete (and might never be, as the error handling for pathological network partners is hard to trigger with a library designed not to misbehave).

Documentation is built using sphinx; hacks used there are described in ./doc/README.doc.

Bugs from design goal and wishlist to typos are currently tracked in github (see below).

Relevant URLs