import socket
import bluetooth

devices = bluetooth.discover_devices(lookup_names=True)
serverAddress = '20:18:12:03:09:85'  # The MAC address of vibrating toolkit

port = 1
blue_s = bluetooth.BluetoothSocket(bluetooth.RFCOMM)
blue_s.connect((serverAddress, port))

s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
s.bind(('127.0.0.1', 2222))  # The UDP target address. 127.0.0.1 by default

print(111)  
vibr = b'11'  # '11' Means lead vehicle braking
before = b'0'  # '0' Means lead vehicle is driving normally
while True:
    data,addr = s.recvfrom(1024)
    leadCarStatus = data.split(b'leadCarStatus:')[-1]
    if (b'11' in leadCarStatus) and (b'11' not in before):
        blue_s.send('5')
        print("send 5 to bluetooth") # '1-5' Means different frequency
    before = leadCarStatus
    print('Braking')