getData OBD

## OBD

def init_connection(baud_rate,com_port,fast):
    connection = obd.Async(com_port,baudrate=baud_rate, fast=fast)
    connection.watch(obd.commands.RPM, callback=new_rpm)
    connection.watch(obd.commands.SPEED, callback=new_speed)
    connection.watch(obd.commands.COOLANT_TEMP, callback=new_coolant_temperature)
    connection.watch(obd.commands.THROTTLE_POS, callback=new_throttle_position)
    connection.start()
    print("hello")

#RPM
def new_rpm(r):
    rpmValue=r.value.magnitude
    rpm_flag=1
    obdjson["rpm"]=rpmValue
#SPEED
def new_speed(r):
    #client.publish(mqtt_topic, qos=0)    
    speed_flag=1
    obdjson["speed"]=r.value.magnitude
    jstemp["telemetry_data"]=obdjson
    json_temp = json.dumps(jstemp)
    print(obdjson)
    client.publish(mqtt_topic, str(obdjson), qos=0)
        
#COOLANT TEMPERATURE
def new_coolant_temperature(r):
    coolant_flag=1
    obdjson["coolant_temp"]=r.value.magnitude
#Throttle position
def new_throttle_position(r):
    throttle_flag=1
    obdjson["throttle_position"]=r.value.magnitude