Read gps device with nodejs under openwrt and cp2102 ttl to usb converter

main.js

var nmea = require('nmea');
var trycatch = require('trycatch');

function watchGps() {
    var spawn = require('child_process').spawn;
    var child = spawn("python", [tempDir + "readGpsDevice.py"]);

    child.stdout.on('data', function (buffer) {
        trycatch(function() {
            var gpsOut = nmea.parse(buffer.toString());

            if (typeof gpsOut.lat != "undefined" && parseFloat(gpsOut.lat) > 0) {
                console.log(gpsOut);
            } else {
                console.log("No gps signal.")
            }
        }, function(error) {
            console.log("Error thrown: " + error);
        });
    });
}

watchGps();

readGpsDevice.py

import sys, serial

connected = False
port = '/dev/ttyUSB0'
baud = 9600

serial = serial.Serial(port, baud, timeout=1)

while not connected:
    connected = True

    while True:
       print serial.readline().rstrip()
       sys.stdout.flush()