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filename = "hrm.py"

ser = None

serio = None

verbose = True # Set this to True to see all of the incoming serial data

def usage():

"""Displays information on the command-line parameters for this script"""

print "Usage: " + filename + " <serialPort>\n"

print "For example:\n"

print " Windows : " + filename + " COM14"

print " OS X : " + filename + " /dev/tty.usbserial-DN009WNO"

print " Linux : " + filename + " /dev/ttyACM0"

return

def checkargs():

"""Validates the command-line arguments for this script"""

if len(sys.argv) < 2:

print "ERROR: Missing serialPort"

usage()

sys.exit(-1)

if len(sys.argv) > 2:

print "ERROR: Too many arguments (expected 1)."

usage()

sys.exit(-2)

def errorhandler(err, exitonerror=True):

"""Display an error message and exit gracefully on "ERROR\r\n" responses"""

print "ERROR: " + err.message

if exitonerror:

ser.close()

sys.exit(-3)

def atcommand(command, delayms=0):

"""Executes the supplied AT command and waits for a valid response"""

serio.write(unicode(command + "\n"))

if delayms:

sleep(delayms/1000)

rx = None

while rx != "OK\r\n" and rx != "ERROR\r\n":

rx = serio.readline(2000)

if verbose:

print unicode(rx.rstrip("\r\n"))

# Check the return value

if rx == "ERROR\r\n":

raise ValueError("AT Parser reported an error on '" + command.rstrip() + "'")

if __name__ == '__main__':

# Make sure we received a single argument (comPort)

checkargs()

# This will automatically open the serial port (no need for ser.open)

ser = serial.Serial(port=sys.argv[1], baudrate=9600, rtscts=True)

serio = io.TextIOWrapper(io.BufferedRWPair(ser, ser, 1),

newline='\r\n',

line_buffering=True)