WiFi Connection - RTT too high

1

Hey!
I’ve a Problem with my WiFi Connection.
When starting the MAVROS, I always get a “RTT is too high” error.
How can i solve that problem?
I’ve even tried the Holybro 433Mhz Module but it didn’t solve the problem either.

roslaunch mavros px4.launch fcu_url:=“tcp://192.168.0.99:6789”
… logging to /home/michi/.ros/log/eb9a0932-842a-11e8-86f8-e091f519dfb7/roslaunch-ssd05-16397.log
Checking log directory for disk usage. This may take awhile.
Press Ctrl-C to interrupt
Done checking log file disk usage. Usage is <1GB.

started roslaunch server http://ssd05:36355/

SUMMARY

CLEAR PARAMETERS

  • /mavros/

PARAMETERS

  • /mavros/cmd/use_comp_id_system_control: False
  • /mavros/conn/heartbeat_rate: 1.0
  • /mavros/conn/system_time_rate: 1.0
  • /mavros/conn/timeout: 10.0
  • /mavros/conn/timesync_rate: 10.0
  • /mavros/distance_sensor/hrlv_ez4_pub/field_of_view: 0.0
  • /mavros/distance_sensor/hrlv_ez4_pub/frame_id: hrlv_ez4_sonar
  • /mavros/distance_sensor/hrlv_ez4_pub/id: 0
  • /mavros/distance_sensor/hrlv_ez4_pub/orientation: PITCH_270
  • /mavros/distance_sensor/hrlv_ez4_pub/send_tf: True
  • /mavros/distance_sensor/hrlv_ez4_pub/sensor_position/x: 0.0
  • /mavros/distance_sensor/hrlv_ez4_pub/sensor_position/y: 0.0
  • /mavros/distance_sensor/hrlv_ez4_pub/sensor_position/z: -0.1
  • /mavros/distance_sensor/laser_1_sub/id: 3
  • /mavros/distance_sensor/laser_1_sub/orientation: PITCH_270
  • /mavros/distance_sensor/laser_1_sub/subscriber: True
  • /mavros/distance_sensor/lidarlite_pub/field_of_view: 0.0
  • /mavros/distance_sensor/lidarlite_pub/frame_id: lidarlite_laser
  • /mavros/distance_sensor/lidarlite_pub/id: 1
  • /mavros/distance_sensor/lidarlite_pub/orientation: PITCH_270
  • /mavros/distance_sensor/lidarlite_pub/send_tf: True
  • /mavros/distance_sensor/lidarlite_pub/sensor_position/x: 0.0
  • /mavros/distance_sensor/lidarlite_pub/sensor_position/y: 0.0
  • /mavros/distance_sensor/lidarlite_pub/sensor_position/z: -0.1
  • /mavros/distance_sensor/sonar_1_sub/id: 2
  • /mavros/distance_sensor/sonar_1_sub/orientation: PITCH_270
  • /mavros/distance_sensor/sonar_1_sub/subscriber: True
  • /mavros/fake_gps/eph: 2.0
  • /mavros/fake_gps/epv: 2.0
  • /mavros/fake_gps/fix_type: 3
  • /mavros/fake_gps/geo_origin/alt: 408.0
  • /mavros/fake_gps/geo_origin/lat: 47.3667
  • /mavros/fake_gps/geo_origin/lon: 8.55
  • /mavros/fake_gps/gps_rate: 5.0
  • /mavros/fake_gps/mocap_transform: True
  • /mavros/fake_gps/satellites_visible: 5
  • /mavros/fake_gps/tf/child_frame_id: fix
  • /mavros/fake_gps/tf/frame_id: map
  • /mavros/fake_gps/tf/listen: False
  • /mavros/fake_gps/tf/rate_limit: 10.0
  • /mavros/fake_gps/tf/send: False
  • /mavros/fake_gps/use_mocap: True
  • /mavros/fake_gps/use_vision: False
  • /mavros/fcu_protocol: v2.0
  • /mavros/fcu_url: tcp://192.168.0.9…
  • /mavros/gcs_url:
  • /mavros/global_position/child_frame_id: base_link
  • /mavros/global_position/frame_id: map
  • /mavros/global_position/gps_uere: 1.0
  • /mavros/global_position/rot_covariance: 99999.0
  • /mavros/global_position/tf/child_frame_id: base_link
  • /mavros/global_position/tf/frame_id: map
  • /mavros/global_position/tf/global_frame_id: earth
  • /mavros/global_position/tf/send: False
  • /mavros/global_position/use_relative_alt: True
  • /mavros/image/frame_id: px4flow
  • /mavros/imu/angular_velocity_stdev: 0.000349065850399
  • /mavros/imu/frame_id: base_link
  • /mavros/imu/linear_acceleration_stdev: 0.0003
  • /mavros/imu/magnetic_stdev: 0.0
  • /mavros/imu/orientation_stdev: 1.0
  • /mavros/local_position/frame_id: map
  • /mavros/local_position/tf/child_frame_id: base_link
  • /mavros/local_position/tf/frame_id: map
  • /mavros/local_position/tf/send: False
  • /mavros/local_position/tf/send_fcu: False
  • /mavros/mission/pull_after_gcs: True
  • /mavros/mocap/use_pose: True
  • /mavros/mocap/use_tf: False
  • /mavros/odometry/frame_tf/body_frame_orientation: frd
  • /mavros/odometry/frame_tf/local_frame: vision_ned
  • /mavros/plugin_blacklist: [‘safety_area’, '…
  • /mavros/plugin_whitelist:
  • /mavros/px4flow/frame_id: px4flow
  • /mavros/px4flow/ranger_fov: 0.118682389136
  • /mavros/px4flow/ranger_max_range: 5.0
  • /mavros/px4flow/ranger_min_range: 0.3
  • /mavros/safety_area/p1/x: 1.0
  • /mavros/safety_area/p1/y: 1.0
  • /mavros/safety_area/p1/z: 1.0
  • /mavros/safety_area/p2/x: -1.0
  • /mavros/safety_area/p2/y: -1.0
  • /mavros/safety_area/p2/z: -1.0
  • /mavros/setpoint_accel/send_force: False
  • /mavros/setpoint_attitude/reverse_thrust: False
  • /mavros/setpoint_attitude/tf/child_frame_id: target_attitude
  • /mavros/setpoint_attitude/tf/frame_id: map
  • /mavros/setpoint_attitude/tf/listen: False
  • /mavros/setpoint_attitude/tf/rate_limit: 50.0
  • /mavros/setpoint_attitude/use_quaternion: False
  • /mavros/setpoint_position/mav_frame: LOCAL_NED
  • /mavros/setpoint_position/tf/child_frame_id: target_position
  • /mavros/setpoint_position/tf/frame_id: map
  • /mavros/setpoint_position/tf/listen: False
  • /mavros/setpoint_position/tf/rate_limit: 50.0
  • /mavros/setpoint_velocity/mav_frame: LOCAL_NED
  • /mavros/startup_px4_usb_quirk: True
  • /mavros/sys/disable_diag: False
  • /mavros/sys/min_voltage: 10.0
  • /mavros/target_component_id: 1
  • /mavros/target_system_id: 1
  • /mavros/tdr_radio/low_rssi: 40
  • /mavros/time/time_ref_source: fcu
  • /mavros/time/timesync_avg_alpha: 0.6
  • /mavros/time/timesync_mode: MAVLINK
  • /mavros/vibration/frame_id: base_link
  • /mavros/vision_pose/tf/child_frame_id: vision_estimate
  • /mavros/vision_pose/tf/frame_id: map
  • /mavros/vision_pose/tf/listen: False
  • /mavros/vision_pose/tf/rate_limit: 10.0
  • /mavros/vision_speed/listen_twist: True
  • /mavros/vision_speed/twist_cov: True
  • /rosdistro: kinetic
  • /rosversion: 1.12.12

NODES
/
mavros (mavros/mavros_node)

auto-starting new master
process[master]: started with pid [16408]
ROS_MASTER_URI=http://localhost:11311

setting /run_id to eb9a0932-842a-11e8-86f8-e091f519dfb7
process[rosout-1]: started with pid [16421]
started core service [/rosout]
process[mavros-2]: started with pid [16439]
[ INFO] [1531218051.601935345]: FCU URL: tcp://192.168.0.99:6789
[ INFO] [1531218051.603537429]: tcp0: Server address: 192.168.0.99:6789
[ INFO] [1531218051.846622817]: GCS bridge disabled
[ INFO] [1531218051.878440979]: Plugin 3dr_radio loaded
[ INFO] [1531218051.880607254]: Plugin 3dr_radio initialized
[ INFO] [1531218051.880768288]: Plugin actuator_control loaded
[ INFO] [1531218051.885063425]: Plugin actuator_control initialized
[ INFO] [1531218051.887140591]: Plugin adsb loaded
[ INFO] [1531218051.889886974]: Plugin adsb initialized
[ INFO] [1531218051.889985479]: Plugin altitude loaded
[ INFO] [1531218051.890809968]: Plugin altitude initialized
[ INFO] [1531218051.890879455]: Plugin cam_imu_sync loaded
[ INFO] [1531218051.891384417]: Plugin cam_imu_sync initialized
[ INFO] [1531218051.891490155]: Plugin command loaded
[ INFO] [1531218051.895585212]: Plugin command initialized
[ INFO] [1531218051.895667875]: Plugin debug_value loaded
[ INFO] [1531218051.899482906]: Plugin debug_value initialized
[ INFO] [1531218051.899501911]: Plugin distance_sensor blacklisted
[ INFO] [1531218051.899598665]: Plugin fake_gps loaded
[ INFO] [1531218051.912311906]: Plugin fake_gps initialized
[ INFO] [1531218051.912616373]: Plugin ftp loaded
[ INFO] [1531218051.919168345]: Plugin ftp initialized
[ INFO] [1531218051.919301841]: Plugin global_position loaded
[ INFO] [1531218051.932757749]: Plugin global_position initialized
[ INFO] [1531218051.932867605]: Plugin hil loaded
[ INFO] [1531218051.946009703]: Plugin hil initialized
[ INFO] [1531218051.946162118]: Plugin home_position loaded
[ INFO] [1531218051.949241909]: Plugin home_position initialized
[ INFO] [1531218051.949338406]: Plugin imu loaded
[ INFO] [1531218051.956062028]: Plugin imu initialized
[ INFO] [1531218051.956163998]: Plugin local_position loaded
[ INFO] [1531218051.960918562]: Plugin local_position initialized
[ INFO] [1531218051.961026467]: Plugin manual_control loaded
[ INFO] [1531218051.963787533]: Plugin manual_control initialized
[ INFO] [1531218051.963875022]: Plugin mocap_pose_estimate loaded
[ INFO] [1531218051.967708119]: Plugin mocap_pose_estimate initialized
[ INFO] [1531218051.967795339]: Plugin obstacle_distance loaded
[ INFO] [1531218051.970038290]: Plugin obstacle_distance initialized
[ INFO] [1531218051.970128314]: Plugin odom loaded
[ INFO] [1531218051.974802538]: Plugin odom initialized
[ INFO] [1531218051.975012858]: Plugin param loaded
[ INFO] [1531218051.978397134]: Plugin param initialized
[ INFO] [1531218051.978544703]: Plugin px4flow loaded
[ INFO] [1531218051.984903923]: Plugin px4flow initialized
[ INFO] [1531218051.984929467]: Plugin rangefinder blacklisted
[ INFO] [1531218051.985078197]: Plugin rc_io loaded
[ INFO] [1531218051.988352218]: Plugin rc_io initialized
[ INFO] [1531218051.988373486]: Plugin safety_area blacklisted
[ INFO] [1531218051.988488503]: Plugin setpoint_accel loaded
[ INFO] [1531218051.991510287]: Plugin setpoint_accel initialized
[ INFO] [1531218051.991690049]: Plugin setpoint_attitude loaded
[ INFO] [1531218052.001071003]: Plugin setpoint_attitude initialized
[ INFO] [1531218052.001194805]: Plugin setpoint_position loaded
[ INFO] [1531218052.015233110]: Plugin setpoint_position initialized
[ INFO] [1531218052.015377212]: Plugin setpoint_raw loaded
[ INFO] [1531218052.023519527]: Plugin setpoint_raw initialized
[ INFO] [1531218052.023631813]: Plugin setpoint_velocity loaded
[ INFO] [1531218052.028931564]: Plugin setpoint_velocity initialized
[ INFO] [1531218052.029122001]: Plugin sys_status loaded
[ INFO] [1531218052.037756370]: Plugin sys_status initialized
[ INFO] [1531218052.037908966]: Plugin sys_time loaded
[ INFO] [1531218052.044285038]: TM: Timesync mode: MAVLINK
[ INFO] [1531218052.045295383]: Plugin sys_time initialized
[ INFO] [1531218052.045405263]: Plugin trajectory loaded
[ INFO] [1531218052.050138692]: Plugin trajectory initialized
[ INFO] [1531218052.050254799]: Plugin vfr_hud loaded
[ INFO] [1531218052.050883680]: Plugin vfr_hud initialized
[ INFO] [1531218052.050905689]: Plugin vibration blacklisted
[ INFO] [1531218052.050998374]: Plugin vision_pose_estimate loaded
[ INFO] [1531218052.058066291]: Plugin vision_pose_estimate initialized
[ INFO] [1531218052.058159128]: Plugin vision_speed_estimate loaded
[ INFO] [1531218052.061959518]: Plugin vision_speed_estimate initialized
[ INFO] [1531218052.062074759]: Plugin waypoint loaded
[ INFO] [1531218052.066462039]: Plugin waypoint initialized
[ INFO] [1531218052.066589210]: Plugin wind_estimation loaded
[ INFO] [1531218052.067394728]: Plugin wind_estimation initialized
[ INFO] [1531218052.067438455]: Autostarting mavlink via USB on PX4
[ INFO] [1531218052.067538943]: Built-in SIMD instructions: SSE, SSE2
[ INFO] [1531218052.067555680]: Built-in MAVLink package version: 2018.6.6
[ INFO] [1531218052.067573594]: Known MAVLink dialects: common ardupilotmega ASLUAV autoquad icarous matrixpilot paparazzi slugs standard uAvionix ualberta
[ INFO] [1531218052.067590149]: MAVROS started. MY ID 1.240, TARGET ID 1.1
[ WARN] [1531218053.474112519]: TM : RTT too high for timesync: 828.38 ms.
[ WARN] [1531218053.592180347]: TM : RTT too high for timesync: 346.48 ms.
[ INFO] [1531218054.004098041]: CON: Got HEARTBEAT, connected. FCU: PX4 Autopilot
[ WARN] [1531218054.125162990]: TM : RTT too high for timesync: 279.65 ms.
[ INFO] [1531218054.491457160]: IMU: High resolution IMU detected!
[ WARN] [1531218054.626190088]: TM : RTT too high for timesync: 180.24 ms.
[ INFO] [1531218055.147518178]: VER: 1.1: Capabilities 0x000000000000e4ef
[ INFO] [1531218055.147638029]: VER: 1.1: Flight software: 010800ff (00000000F3E3ADAE)
[ INFO] [1531218055.147708730]: VER: 1.1: Middleware software: 010800ff (00000000F3E3ADAE)
[ INFO] [1531218055.147770755]: VER: 1.1: OS software: 071600ff (0000000000000000)
[ INFO] [1531218055.147821656]: VER: 1.1: Board hardware: 00000011
[ INFO] [1531218055.147911459]: VER: 1.1: VID/PID: 26ac:0011
[ INFO] [1531218055.147993007]: VER: 1.1: UID: 3335510f35303335
[ WARN] [1531218055.148320997]: TM : RTT too high for timesync: 102.18 ms.
[ WARN] [1531218055.526575698]: CMD: Unexpected command 520, result 0
[ WARN] [1531218056.162556478]: TM : RTT too high for timesync: 417.12 ms.
[ WARN] [1531218056.766696690]: TM : RTT too high for timesync: 420.96 ms.
[ WARN] [1531218057.578366457]: TM : RTT too high for timesync: 632.38 ms.
[ WARN] [1531218057.646065815]: TM : RTT too high for timesync: 99.89 ms.
[ WARN] [1531218058.170546951]: TM : RTT too high for timesync: 24.69 ms.
[ WARN] [1531218058.805349389]: TM : RTT too high for timesync: 59.83 ms.
[ WARN] [1531218059.458647460]: TM : RTT too high for timesync: 112.35 ms.
[ WARN] [1531218060.016798100]: TM : RTT too high for timesync: 70.44 ms.
[ WARN] [1531218060.628305920]: TM : RTT too high for timesync: 82.33 ms.
[ WARN] [1531218061.259390777]: TM : RTT too high for timesync: 112.88 ms.
[ WARN] [1531218061.794250222]: TM : RTT too high for timesync: 48.44 ms.
[ WARN] [1531218062.425796467]: TM : RTT too high for timesync: 79.56 ms.
[ WARN] [1531218063.013039406]: TM : RTT too high for timesync: 66.56 ms.
[ WARN] [1531218063.614891439]: TM : RTT too high for timesync: 69.45 ms.
[ INFO] [1531218064.005348284]: HP: requesting home position
[ WARN] [1531218064.322185101]: TM : RTT too high for timesync: 176.21 ms.
[ WARN] [1531218065.369358959]: TM : RTT too high for timesync: 223.51 ms.
[ WARN] [1531218066.168802795]: TM : RTT too high for timesync: 222.30 ms.
[ WARN] [1531218066.979839989]: TM : RTT too high for timesync: 233.69 ms.
[ WARN] [1531218067.878687508]: TM : RTT too high for timesync: 233.23 ms.
[ WARN] [1531218068.497866234]: TM : RTT too high for timesync: 51.78 ms.
[ INFO] [1531218069.077872919]: WP: mission received
[ WARN] [1531218069.078438875]: TM : RTT too high for timesync: 32.65 ms.
[ WARN] [1531218069.416856050]: PR: request param #65 timeout, retries left 2, and 47 params still missing
[ WARN] [1531218069.762507929]: TM : RTT too high for timesync: 116.39 ms.
[ WARN] [1531218070.359780260]: TM : RTT too high for timesync: 113.85 ms.
[ WARN] [1531218070.460323524]: PR: request param #72 timeout, retries left 2, and 46 params still missing
[ WARN] [1531218070.902036347]: TM : RTT too high for timesync: 56.06 ms.
[ WARN] [1531218071.535571909]: PR: request param #84 timeout, retries left 2, and 45 params still missing
[ WARN] [1531218071.667923018]: TM : RTT too high for timesync: 221.81 ms.
[ WARN] [1531218072.172602168]: TM : RTT too high for timesync: 127.17 ms.
[ WARN] [1531218072.742384351]: TM : RTT too high for timesync: 96.64 ms.
[ WARN] [1531218072.771245378]: PR: request param #108 timeout, retries left 2, and 44 params still missing
^C[mavros-2] killing on exit
[rosout-1] killing on exit
[master] killing on exit
shutting down processing monitor…
… shutting down processing monitor complete

header:
seq: 18
stamp:
secs: 1531218068
nsecs: 568927571
frame_id: ‘’
status:

level: 0
name: “mavros: FCU connection”
message: “connected”
hardware_id: “tcp://192.168.0.99:6789”
values:

key: "Received packets:"
value: "919"
  • key: “Dropped packets:”
    value: “0”
  • key: “Buffer overruns:”
    value: “0”
  • key: “Parse errors:”
    value: “0”
  • key: “Rx sequence number:”
    value: “123”
  • key: “Tx sequence number:”
    value: “200”
  • key: “Rx total bytes:”
    value: “34530”
  • key: “Tx total bytes:”
    value: “5389”
  • key: “Rx speed:”
    value: “8047.000000”
  • key: “Tx speed:”
    value: “460.000000”

level: 2
name: “mavros: GPS”
message: “No satellites”
hardware_id: “tcp://192.168.0.99:6789”
values:

key: "Satellites visible"
value: "0"
  • key: “Fix type”
    value: “0”
  • key: “EPH (m)”
    value: “Unknown”
  • key: “EPV (m)”
    value: “Unknown”

level: 0
name: “mavros: Heartbeat”
message: “Normal”
hardware_id: “tcp://192.168.0.99:6789”
values:

key: "Heartbeats since startup"
value: "15"
  • key: “Frequency (Hz)”
    value: “0.999969”
  • key: “Vehicle type”
    value: “Quadrotor”
  • key: “Autopilot type”
    value: “PX4 Autopilot”
  • key: “Mode”
    value: “MANUAL”
  • key: “System status”
    value: “Standby”

level: 0
name: “mavros: System”
message: “Normal”
hardware_id: “tcp://192.168.0.99:6789”
values:

key: "Sensor present"
value: "0x00000000"
  • key: “Sensor enabled”
    value: “0x00000000”
  • key: “Sensor helth”
    value: “0x00000000”
  • key: “CPU Load (%)”
    value: “41.2”
  • key: “Drop rate (%)”
    value: “0.0”
  • key: “Errors comm”
    value: “0”
  • key: “Errors count #1”
    value: “0”
  • key: “Errors count #2”
    value: “0”
  • key: “Errors count #3”
    value: “0”
  • key: “Errors count #4”
    value: “0”

level: 0
name: “mavros: Battery”
message: “Normal”
hardware_id: “tcp://192.168.0.99:6789”
values:

key: "Voltage"
value: "12.32"
  • key: “Current”
    value: “0.0”
  • key: “Remaining”
    value: “100.0”

level: 0
name: “mavros: Time Sync”
message: “Normal”
hardware_id: “tcp://192.168.0.99:6789”
values:

key: "Timesyncs since startup"
value: "150"
  • key: “Frequency (Hz)”
    value: “9.153596”
  • key: “Last RTT (ms)”
    value: “51.781069”
  • key: “Mean RTT (ms)”
    value: “224.284105”
  • key: “Last remote time (s)”
    value: “102.098593000”
  • key: “Estimated time offset (s)”
    value: “0.000000000”

header:
seq: 19
stamp:
secs: 1531218070
nsecs: 69060304
frame_id: ‘’
status:

level: 0
name: “mavros: FCU connection”
message: “connected”
hardware_id: “tcp://192.168.0.99:6789”
values:

key: "Received packets:"
value: "955"
  • key: “Dropped packets:”
    value: “0”
  • key: “Buffer overruns:”
    value: “0”
  • key: “Parse errors:”
    value: “0”
  • key: “Rx sequence number:”
    value: “159”
  • key: “Tx sequence number:”
    value: “222”
  • key: “Rx total bytes:”
    value: “35680”
  • key: “Tx total bytes:”
    value: “5933”
  • key: “Rx speed:”
    value: “1150.000000”
  • key: “Tx speed:”
    value: “544.000000”

level: 2
name: “mavros: GPS”
message: “No satellites”
hardware_id: “tcp://192.168.0.99:6789”
values:

key: "Satellites visible"
value: "0"
  • key: “Fix type”
    value: “0”
  • key: “EPH (m)”
    value: “Unknown”
  • key: “EPV (m)”
    value: “Unknown”

level: 0
name: “mavros: Heartbeat”
message: “Normal”
hardware_id: “tcp://192.168.0.99:6789”
values:

key: "Heartbeats since startup"
value: "17"
  • key: “Frequency (Hz)”
    value: “0.999925”
  • key: “Vehicle type”
    value: “Quadrotor”
  • key: “Autopilot type”
    value: “PX4 Autopilot”
  • key: “Mode”
    value: “MANUAL”
  • key: “System status”
    value: “Standby”

level: 0
name: “mavros: System”
message: “Normal”
hardware_id: “tcp://192.168.0.99:6789”
values:

key: "Sensor present"
value: "0x00000000"
  • key: “Sensor enabled”
    value: “0x00000000”
  • key: “Sensor helth”
    value: “0x00000000”
  • key: “CPU Load (%)”
    value: “41.2”
  • key: “Drop rate (%)”
    value: “0.0”
  • key: “Errors comm”
    value: “0”
  • key: “Errors count #1”
    value: “0”
  • key: “Errors count #2”
    value: “0”
  • key: “Errors count #3”
    value: “0”
  • key: “Errors count #4”
    value: “0”

level: 0
name: “mavros: Battery”
message: “Normal”
hardware_id: “tcp://192.168.0.99:6789”
values:

key: "Voltage"
value: "12.32"
  • key: “Current”
    value: “0.0”
  • key: “Remaining”
    value: “100.0”

level: 0
name: “mavros: Time Sync”
message: “Normal”
hardware_id: “tcp://192.168.0.99:6789”
values:

key: "Timesyncs since startup"
value: "165"
  • key: “Frequency (Hz)”
    value: “9.230091”
  • key: “Last RTT (ms)”
    value: “66.680074”
  • key: “Mean RTT (ms)”
    value: “211.941901”
  • key: “Last remote time (s)”
    value: “103.600513000”
  • key: “Estimated time offset (s)”
    value: “0.000000000”
2

I’m now receiving this problem too, @Michi14clp did you ever resolve the issue? How?

3

Hey, I faced the same problem.

Issue is that in offboard control, communication to px4 should be fast. A connection over WiFi will not give sufficient baudrate.

I used a companion computer (raspberry pi), and connected to telem 2 of pixhawk through serial connection at baudrate 921600.

This will ensure that RTT is less for mavros. Thus, run mavros on pi, but communicate to mavros through wifi of pi.

4

I’m pretty sure that’s what I’m doing. I have a Jetson TX2 connected to Telem 2 of PixHawk, and I’m SSHed to the Jetson over WiFi.

5

The initial question on this thread, was connecting to the flight controller via a TCP connection. I guess if you are going over serial, this is a different problem

In case of the Jetson, what carrier board are you using? Some carrier boards use one of the UARTs as a serial console, which makes it problematic if you are sharing it with the flight controller

6

For the case of using serial telemetry connection, after the timesync_rate parameter, in mavros/launch/px4_config.yaml file, changed to 0.0, the ‘RTT Too high’ problem disappeared.

7

[Report] Today, this problem happened when I connected an onboard computer to a pixhawk by USB cable. After I changed timesync_rate from 10.0 (default) to 0.0, the problem disappeared.