python, BLE GATT client test ( central device/nanoPI)

getCharacteristic.py

# -*- coding: utf-8 -*-
from bluepy import btle
from bluepy.btle import BTLEException
import time
import datetime
import sys
import traceback

LIGHT_MAC_ADDR="00:00:00:00:00:00"
mCHAR_UUID = 0xFF01

#
def get2byteUUID(sUUID):
	sRet=""
	if(len(sUUID) >= 8):
		sRet= "0x"+ sUUID[4:8]
	return sRet
#
def getGATT_char(cRead ):
	ret=""
	for temp in cRead:
		#print(temp  )
		ret +=temp
	return ret

def mainLoop():
    # connect
    tPeripheral = btle.Peripheral(deviceAddr=LIGHT_MAC_ADDR)
    # find-characteristic
    tCharList = tPeripheral.getCharacteristics()
    iLen = len(tCharList)
#    print(iLen )
    for tChar in tCharList:
#    	print tChar
    	if (tChar.properties==26):
    		#print tChar.properties
    		sUUID=get2byteUUID( str(tChar.uuid) )
    		iUUID =int(sUUID ,16 )
    		if(iUUID== mCHAR_UUID ):
    			print "#uuid="+ str(tChar.uuid )
    			cRead = tChar.read()
    			print("rdLen=" + str(len(cRead )))
    			sRead = getGATT_char(cRead )
    			print("sRead="+ sRead)	
	
if __name__ == '__main__':
	from datetime import datetime
	while True:
		sTime = datetime.now().strftime("%Y-%m-%d %H:%M:%S")
		print("time=" +sTime)
		mainLoop()
		time.sleep(3.0)