transmitting sensor data python websocket

Engage in a few days, the way the code is posted here, you need the python package:

peddled, peddled-WebSocket, bottle, wiringpi-python

gevent provides support for concurrent, and concurrent operations under the socket. Note that, after the introduction of monkey, socket is encapsulated genvent off, the system is no longer the original socket.

After connecting to / ws, links for long link using gevent.Timeout () alarm cycle to provide a sensor read operation is performed, and transmits the read data to the client.

The default is to return a web client, provides a textarea, the display server to send out the data.

from bottle import route, run, request, abort, Bottle, static_file
from gevent import monkey; monkey.patch_all()
from gevent import sleep, Timeout

import wiringpi
import serial

app = Bottle()

host = '0.0.0.0'
port = 8080

SensorData = ''

fdI2c = wiringpi.wiringPiI2CSetup(0x40)
ser = serial.Serial("/dev/ttyUSB0", 9600, timeout = 0.1)

def readSensor():
    global SensorData
    
    serBuffer = ser.readline().rstrip()
    if len(serBuffer) == 0:
        serBuffer = "0";

    strength = wiringpi.wiringPiI2CReadReg16(fdI2c, 0x1c);
    position = wiringpi.wiringPiI2CReadReg16(fdI2c, 0x0c);
    angle = wiringpi.wiringPiI2CReadReg16(fdI2c, 0x0e);
    
    SensorData = serBuffer + ":" \
                 + str(strength) + ":" \
                 + str(position) + ":" \
                 + str(angle);

@app.route('/ws')
def handle_websocket():
    wsock = request.environ.get('wsgi.websocket')
    if not wsock:
        abort(400, 'Expected WebSocket request.')
    while True:
        try:
            global SensorData
            with Timeout(0.5, False) as timeout:
                message = wsock.receive()
            if not message:
                readSensor()
                message = SensorData

            wsock.send("%r" % message)

            message = u''
        except WebSocketError:
            break

@app.route('/')
def send_index():
    return """<html>
<head>
  <script type='application/javascript' src='https://ajax.googleapis.com/ajax/libs/jquery/1.8.3/jquery.min.js'></script>
  <script type="text/javascript">
    var ws = new WebSocket("ws://%(host)s/ws");
    ws.onopen = function() {
        ws.send("Hello, world");
    };
    ws.onmessage = function (evt) {
        . $ ( '# Cat') val ($ ( '# cat') val () + evt.data + '\\ n'.);
    };
  </script>
</head>
<body>
<form action='#' id='chatform' method='get'>
    <textarea id='chat' cols='100' rows='20'></textarea>
</form>

</body>
</html>"""%{'host':request.headers.get('Host')}

from gevent.pywsgi import WSGIServer
from geventwebsocket.handler import WebSocketHandler
from geventwebsocket import WebSocketError

server = WSGIServer((host, port), app, handler_class=WebSocketHandler)

print "access @ http://%s:%s" % (host, port)
server.serve_forever()

transmitting sensor data python websocket

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