> For the complete documentation index, see [llms.txt](https://theiotlearninginitiative.gitbook.io/internetofthingscommunications/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://theiotlearninginitiative.gitbook.io/internetofthingscommunications/protocols/constrained-application-protocol.md).

# Constrained Application Protocol

## Constrained Application Protocol

> The Web of Things Protocol
>
> Constrained Application Protocol (CoAP) is a software protocol intended to be used in very simple electronics devices that allows them to communicate interactively over the Internet. It is particularly targeted for small low power sensors, switches, valves and similar components that need to be controlled or supervised remotely, through standard Internet networks ... *From Wikipedia, the free encyclopedia*
>
> CoAp has a request/response model protocol, clients can make GET, PUT, POST and DELETE requests to resources. Please notice that CoAp does not have SSL/TLS ecryption isn't available over UDP, CoAP makes use of DTLS (Datagram Transport Layer Security). The default level of encryption is equivalent to a 3,072-bit RSA key. Also, CoAp lacks of a publish-subscribe message queue.

* [Eclipse CoAP](http://iot.eclipse.org/getting-started#tutorials)
* [Npm Iopa-Coap](https://www.npmjs.com/package/iopa-coap)
* [Npm Coap](https://www.npmjs.com/package/coap)
* [Constrained Application Protocol (CoAP)](http://tools.ietf.org/html/draft-ietf-core-coap-18)
* [Firefox Copper Cu](https://addons.mozilla.org/en-US/firefox/addon/copper-270430/)
* [Working with bottlenecks: CoAP and MQTT](http://learninginternetofthings.com/bottlenecks-coap-mqtt/)
* [Youtube ARM Constrained Application Protocol (CoAP) Tutorial](https://youtu.be/4bSr5x5gKvA?list=PLgyFKd2HIZlZNsrWXyE4kgLDo_tyLpvDW)

## The Node COAP Library

> A CoAP library for node modelled after 'http'

* [A CoAP library for node](https://www.npmjs.com/package/coap)

```bash
root@edison:~# npm install coap
-\|/-\|/-\|/--\|/-\|/-\|/-\|-\|/-\|/-\|/-\|-\|/-\|/-\|/-\|/coap@0.15.0 node_modules/coap
��├��─��─ capitalize@1.0.0
��├��─��─ bl@1.0.3
��├��─��─ coap-packet@0.1.13
��├��─��─ debug@2.2.0 (ms@0.7.1)
��├��─��─ lru-cache@4.0.1 (pseudomap@1.0.2, yallist@2.0.0)
��├��─��─ fastseries@1.7.2 (xtend@4.0.1, reusify@1.0.1)
��└��─��─ readable-stream@2.0.6 (process-nextick-args@1.0.6, inherits@2.0.1, util-deprecate@1.0.2, str)
root@edison:~#
```

## The Python CoAP library

> The aiocoap package is a Python implementation of CoAP, the Constrained Application Protocol (RFC 7252, more info at <http://coap.technology/>).

* [The Python CoAP library](https://github.com/chrysn/aiocoap)
* [aiocoap – The Python CoAP library](http://aiocoap.readthedocs.io/en/latest/)

```bash
root@edison:~# pip install aiocoap
Downloading/unpacking aiocoap
Installing collected packages: aiocoap
Successfully installed aiocoap
Cleaning up...
root@edison:~#
```

## Copper CU

[Firefox Copper Cu](https://addons.mozilla.org/en-US/firefox/addon/copper-270430/)