CoAP Python Client-Server

CoAP Python Client-Server

CoAP (Constrained Application Protocol) an IoT protocol . CoAP is designed for use in constrained networks such as those found in IoT devices. We'll cover the basics of what CoAP is, how it works, and its key features, including its lightweight nature and support for asynchronous messaging.

coap-client.py

import asyncio
import random
from aiocoap import *

async def main():
    context = await Context.create_client_context()
    alarm_state = random.choice([True, False])
    payload = b"OFF"
    if alarm_state:
        payload = b"ON"
    request = Message(code=PUT, payload=payload, uri="coap://127.0.0.1/alarm")
    response = await context.request(request).response
    print('Result: %s\n%r'%(response.code, response.payload))

if __name__ == '__main__':
    asyncio.get_event_loop().run_until_complete(main())

coap-server.py

import aiocoap
import aiocoap.resource as resource


class AlarmResource(resource.Resource):
    """This resource supports the PUT method.
    PUT: Update state of alarm."""
    def __init__(self):
        super().__init__()
        self.state = "OFF"
    async def render_put(self, request):
        self.state = request.payload
        print('Update alarm state: %s' % self.state)
        return aiocoap.Message(code=aiocoap.CHANGED, payload=self.state)
import asyncio


def main():

    # Resource tree creation

    root = resource.Site()

    root.add_resource(['alarm'], AlarmResource())
    asyncio.Task(aiocoap.Context.create_server_context(root, bind=('0.0.0.0', 5683)))
    asyncio.get_event_loop().run_forever()
if __name__ == "__main__":
    main()

Chekout the demo video - https://youtu.be/-Lab-QLUxjg