client.py

#!/usr/bin/python

"""
The client gets the WiFi signal strength and sends that over the network to the server part.
"""

import subprocess
import socket
import json
import argparse
import sys
from Signal import *
from time import sleep

"""
Using the wavemon package, we get the signal strength - mW and dBm.
Return type is of type Signal.
"""
def getSignalWaveMon():
	query = "wavemon -d | grep signal"
	output = subprocess.check_output(query.split())
	output = output[output.index("signal")+14:]
	output = output[:output.index("mW)")+3]
	dBm = int(output[:output.index("dBm")])
	mW = float(output[output.index("(")+1:output.index(")")-3])
	return Signal(dBm,mW)

def createSocket(server,port):
	sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
	sock.connect((server[0],port))
	return sock
	

def send(sock):
	hostname = socket.gethostname()

	try:
		#print("Sending hostname")
		sock.send(hostname+"\n")
		#print("Deleting hostname variable")
		del hostname
		#print("Awaiting time")
		time = -1
		buffr = ""

		while(time == -1):
			buff = sock.recv(32)
			buffr += buff

			if('\n' in buff):
				indx = buffr.index('\n')
		#		print("Getting time: >%s<" % buffr[:indx])
				time = float(buffr[:indx])
				buffr = buffr[indx+1:]

		print("Received time of %s"%time)
		while(True):
			sleep(time)
			payload = getSignalWaveMon().toJSON()
			sock.send(payload+"\n")

	except KeyboardInterrupt:
		sys.exit(0)
	finally:
		print("Closing socket")
		sock.shutdown(socket.SHUT_RDWR)
		sock.close()
		print("Done")

if(__name__ == "__main__"):
	#print(fromJSON(getSignalWaveMon().toJSON()))
	parser = argparse.ArgumentParser(description="Sends WiFi signal strength, mW and dBm, to a given server.")
	parser.add_argument("-s", help="Server to use.", dest="server", nargs=1, required=True, type=str)
	parser.add_argument("-p", help="Port number to send to. Default is 12000 server side.", dest="port", type=int, nargs=1, default=12000)

	args = parser.parse_args()
	sock = createSocket(args.server,args.port)
	send(sock)