i cannot connect raspberry pi with apm
07-Jun-22 17:31:53 [WARNING] Link timeout, no heartbeat in last 5 seconds
07-Jun-22 17:32:18 [ERROR] Exception in MAVLink input loop
Traceback (most recent call last):
** File “/usr/local/lib/python3.9/dist-packages/dronekit/mavlink.py”, line 211, in mavlink_thread_in**
** fn(self)**
** File “/usr/local/lib/python3.9/dist-packages/dronekit/init.py”, line 1370, in listener**
** raise APIException(‘No heartbeat in %s seconds, aborting.’ %**
dronekit.APIException: No heartbeat in 30 seconds, aborting.
07-Jun-22 17:32:19 [ERROR] Timeout in initializing connection.
Traceback (most recent call last):
** File “/home/pi/Desktop/cloudapp-raspi/app.py”, line 54, in **
** drone = Drone(config)**
** File “/home/pi/Desktop/cloudapp-raspi/drone.py”, line 19, in init**
** self.vehicle = connect(rpi_ip + “:” + sim_port, wait_ready=True, baud=115200)**
** File “/usr/local/lib/python3.9/dist-packages/dronekit/init.py”, line 3166, in connect**
** vehicle.initialize(rate=rate, heartbeat_timeout=heartbeat_timeout)**
** File “/usr/local/lib/python3.9/dist-packages/dronekit/init.py”, line 2275, in initialize**
** raise APIException(‘Timeout in initializing connection.’)**
dronekit.APIException: Timeout in initializing connection.