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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)

# Add the HRM service and characteristic definitions

try:

atcommand("AT+FACTORYRESET", 1000) # Wait 1s for this to complete

atcommand("AT+GATTCLEAR")

atcommand("AT+GATTADDSERVICE=UUID=0x180D")

atcommand("AT+GATTADDCHAR=UUID=0x2A37, PROPERTIES=0x10, MIN_LEN=2, MAX_LEN=3, VALUE=00-40"

atcommand("AT+GATTADDCHAR=UUID=0x2A38, PROPERTIES=0x02, MIN_LEN=1, VALUE=3"

atcommand("AT+GAPSETADVDATA=02-01-06-05-02-0d-18-0a-18")

# Perform a system reset and wait 1s to come back online

atcommand("ATZ", 1000)

# Update the value every second

while True:

atcommand("AT+GATTCHAR=1,00-%02X" % random.randint(50, 100), 1000)

except ValueError as err:

# One of the commands above returned "ERROR\n"

errorhandler(err)

except KeyboardInterrupt:

# Close gracefully on CTRL+C

ser.close()

sys.exit()