#!/usr/bin/env python

# (C) 2009 Kevin Mehall
# http://blog.kevinmehall.net/2009/cell-signal-monitoring
# BSD License

#  sudo rfcomm bind 0 <MAC> 1
#  sudo rfcomm release 0

import pexpect, fdpexpect
import sys,os,time

device=sys.argv[1]
outfile=sys.argv[2]

out=open(outfile, 'a')

print "opening device...",
sys.stdout.flush()
fd = os.open(device, os.O_RDWR|os.O_NOCTTY)
m = fdpexpect.fdspawn(fd, timeout=5, logfile=open('/tmp/cellcom', 'a')) 
m.setecho(False)
print "done"

print "initializing...",
sys.stdout.flush()
m.send("AT S7=45 S0=0 V1 X4 &c1 E0\r")
m.expect("OK")
print "done"

print "checking connection...",
sys.stdout.flush()
m.send("AT\r")
m.expect("OK")
print "ok"

print "starting (at next t%30==0)"

def bars(cind):
	parts=cind.split(',')
	if parts[1]!='1': return -1
	else: return int(parts[4])
	
def sleep_till_30():
	t=time.time()
	s=30-t%30
	print s
	time.sleep(s)
	
while True:
	sleep_till_30()
	print "*",
	m.send("AT+CIND?\r")
	m.expect(r"\+CIND: [^\r\n]*")
	cind=m.match.group(0) #m.before.strip().split('\n')[1]
	print "*",
	m.send("AT+CSQ\r")
	m.expect(r"\+CSQ: [^\r\n]*")
	csq=m.match.group(0) #m.before.strip().split('\n')[1]
	
	line='\t'.join([time.asctime(), cind, csq, '|', str(bars(cind))])
	
	print line 
	out.write(line+'\n')
	out.flush()