WARNING:dronekit:Link timeout, no heartbeat in last 5 seconds - connect() Dronekit does not work

[ce8]

Hi, I started to using the Dronekit, Dronekit-STIL and Mavlink to simulate my python scripts. Afters some days using it without problem I started to receive the error: WARNING:dronekit:Link timeout, no heartbeat in last 5 seconds.

I had tried to reinstall all the things but nothings works.

I had install the PIP pachages on Linux Ubutun 18. I had try the same packages on Ubutun 20 but I receive the same error.

I had install this packages: pymavlink>=2.3.3 MAVProxy-1.8.39 dronekit-2.9.2 dronekit-sitl-3.3.0 Python 2.7.17

Follow my steps to receive the error:

1 - dronekit-sitl copter --home=-25.56731,-42.61554,0,180

os: linux, apm: copter, release: stable SITL already Downloaded and Extracted. Ready to boot. Execute: /home/cesar/.dronekit/sitl/copter-3.3/apm --home=-23.56731,-46.61554,0,180 --model=quad -I 0 Started model quad at -23.56731,-46.61554,0,180 at speed 1.0 bind port 5760 for 0 Starting sketch 'ArduCopter' Serial port 0 on TCP port 5760 Starting SITL input Waiting for connection .... bind port 5762 for 2 Serial port 2 on TCP port 5762 bind port 5763 for 3 Serial port 3 on TCP port 5763

2 - mavproxy.py --master tcp:127.0.0.1:5760 --out udp:127.0.0.1:14551 --out udp:10.0.2.15:14550

Connect tcp:127.0.0.1:5760 source_system=255 Log Directory: Telemetry log: mav.tlog MAV> Waiting for heartbeat from tcp:127.0.0.1:5760 online system 1 STABILIZE> Mode STABILIZE AP: Calibrating barometer AP: Initialising APM... AP: barometer calibration complete AP: GROUND START Init Gyro** INS

G_off: 0.00, 0.00, 0.00 A_off: 0.00, 0.00, 0.00 A_scale: 1.00, 1.00, 1.00

3 - python hello.py

Start simulator (SITL) Starting copter simulator (SITL) SITL already Downloaded and Extracted. Ready to boot. Connecting to vehicle on: tcp:127.0.0.1:5760 WARNING:dronekit:Link timeout, no heartbeat in last 5 seconds

after 30s

ERROR:dronekit.mavlink:Exception in MAVLink input loop Traceback (most recent call last):   File "/usr/local/lib/python2.7/dist-packages/dronekit/mavlink.py", line 211, in mavlink_thread_in     fn(self)   File "/usr/local/lib/python2.7/dist-packages/dronekit/init.py", line 1371, in listener     self._heartbeat_error) APIException: No heartbeat in 30 seconds, aborting. Traceback (most recent call last):   File "hello.py", line 11, in     vehicle = connect(connection_string, wait_ready=True)   File "/usr/local/lib/python2.7/dist-packages/dronekit/init.py", line 3166, in connect     vehicle.initialize(rate=rate, heartbeat_timeout=heartbeat_timeout)   File "/usr/local/lib/python2.7/dist-packages/dronekit/init.py", line 2275, in initialize     raise APIException('Timeout in initializing connection.') dronekit.APIException: Timeout in initializing connection.

[aysegul-sarikaya]

I am getting the same error. WARNING:dronekit:Link timeout, no heartbeat in last 5 seconds.

Did you find a solution to the problem?

[arBalasquide]

@ce8 Hello!

Try changing the connect string from tcp:127.0.0.1:5760 to udp:127.0.0.1:14551 and let me know if that works.

[harmor123]

I'm also having the same issue, have you solved it？Thank you!

python3:

from dronekit import connect

# Connect to the Vehicle (in this case a UDP endpoint)
vehicle = connect('/dev/ttyUSB0', wait_ready=True, baud=921600)

# vehicle is an instance of the Vehicle class
print("Autopilot Firmware version: %s" % vehicle.version)   #飞控版本
print("Autopilot capabilities (supports ftp): %s" % vehicle.capabilities.ftp) 
print("Global Location: %s" % vehicle.location.global_frame )    #全球定位信息（经纬度和高度）
print("Global Location (relative altitude): %s" % vehicle.location.global_relative_frame )  #相对坐标
print("Local Location: %s" % vehicle.location.local_frame)     #NED相对位置信息，东南西北
print("Attitude: %s" % vehicle.attitude)     #无人机朝向：roll,pitch,yaw单位弧度（-π~π）
print("Velocity: %s" % vehicle.velocity)     #三维速度（m/s）
print("GPS: %s" % vehicle.gps_0)             #GPS信息
print("Groundspeed: %s" % vehicle.groundspeed)          #地速（m/s）
print("Airspeed: %s" % vehicle.airspeed )               #空速（m/s）
print("Gimbal status: %s" % vehicle.gimbal )            #云台信息（单位度）
print("Battery: %s" % vehicle.battery      )            #电池信息
print("EKF OK?: %s" % vehicle.ekf_ok  )                 #扩展卡尔曼滤波器信息
print("Last Heartbeat: %s" % vehicle.last_heartbeat) 
print("Rangefinder: %s" % vehicle.rangefinder  )        #超声波或激光雷达模块状态
print("Rangefinder distance: %s" % vehicle.rangefinder.distance  )    #超声波或激光雷达模块的传感距离
print("Rangefinder voltage: %s" % vehicle.rangefinder.voltage)        #超声波或激光雷达模块电压
print("Heading: %s" % vehicle.heading )                               #无人机朝向（单位度）
print("Is Armable?: %s" % vehicle.is_armable      )                   #是否可以解锁
print("System status: %s" % vehicle.system_status.state)              #系统状态
print("Mode: %s" % vehicle.mode.name    )                             # settable飞行模式
print("Armed: %s" % vehicle.armed     )                               # settable解锁状态