GPS signal found/lost and OFFBOARD reject about jmavsim HOT 22 OPEN

(MAV 001:50) [inav] GPS signal found 
(MAV 001:50) [inav] GPS signal lost 

This may indicate that you have hardware GPS connected and disabling it in HIL mode doesn't work. It's known PX4 issue, report them please. As workaround just disconnect GPS module while simulating.

For rejecting OFFBOARD need to digg, PX4 may not receive offboard control topic correctly, or something else. Start from here https://github.com/PX4/Firmware/blob/master/src/modules/commander/commander.cpp#L715 or search for "offboard" in commander.

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I have the same issue with GPS lost/found without connected GPS.

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@DrTon the publication disabling is not a known issue, but was quite recently introduced during a rework of the GPS driver (a week ago or so) on the release branch. Checking master right now.

@Vavooon: Use the stable branch which works fine now. Also make sure to read the offboard control development guide. https://pixhawk.org/dev/offboard_control. In general make sure to raise issues through Github if you want to have current issues resolved timely.

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@DrTon I propose to close this, as its not a jMAVSim issue.

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I filed this issue instead - note that stable / release_v1.0.0, the branches we run for Pixhawk, are not affected.
PX4/PX4-Autopilot#2249

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@LorenzMeier Sorry, but it seems you confused me with @weiweikong .
I don't use Offboard mode and use stable firmware.

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I tried previous version b98862c and it works fine.

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@LorenzMeier I'm sorry, but my autopilot wasn't really updated to RC10 for some reason.
It works fine.

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Great Job in this HIL simulator. I need some help with offboard in jMAVSim. I don't know if somebody can thanks in advance.
I would like to connect jMAVSim with ros in offboard mode by using a launch file. The topics are listed but empty and the offboad mode is rejected. I am using 14.04 and indigo.
After roslaunch running, I can't see the Heartbeat message.

I am able to connect jMAVSim with qgcontrol (last update from yesterday) and pixhawk and RC, by following the usage directions except the 7 step Check “Show Advanced Protocol Options” and enable “Emit Heartbeat” because I did not find that option. I had to disconnect the GPS and callibrate sensors again.

I don't know if my problem is the udp configuration in launch file, I am trying to use my local host like this:

my /etc/hosts is
127.0.0.1 localhost
127.0.1.1 alexPC
192.168.1.1 friend

::1 ip6-localhost ip6-loopback
fe00::0 ip6-localnet
ff00::0 ip6-mcastprefix
ff02::1 ip6-allnodes
ff02::2 ip6-allrouters

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Hi, sorry for the late reply, recently, I have already tested with the

• PX4 Firmware (upgraded by firmware update in QGC with Standard Version (stable))
• jMAVsim (72d353c).

The GPS problem has been fixed. Still, I could not switch to OFFBOARD control.

☑ 1. Pixhawk + jMAVSim + QGC+ ROS => HIL Waypoints

1.1 Baisc Setup

Pixhawk <- [microUSB( /dev/ttyACM0)] -> jMAVSim <- [udp(14555)] -> ROS Nodes<- [udp(14556)] -> QGC

1.1.1. Configuration of jUAVSim Simulator.java

serialMAVLinkPort.open("/dev/ttyACM0", 57600, 8, 1, 0);
udpMavLinkPort.open(new InetSocketAddress("127.0.0.1", 14555), new InetSocketAddress("127.0.0.1", 14550));

1.1.2. Configuration of ROS Launch

• px4_pluginlists.yaml

     plugin_blacklist:
     - 'image_pub'
     - '3dr_radio'
     #- 'setpoint_position'
     - 'setpoint_attitude' 
     - 'setpoint_accel'
     - 'setpoint_velocity'
     - 'actuator_control'

• px4.launch

    <arg name="fcu_url" default="udp://:14550@localhost:14555" />
    <arg name="gcs_url" default="udp://:14557@localhost:14556" />

Question 1: here is a little different with the Pixhawk-HIL Wiki (https://pixhawk.org/dev/ros/hil). With my private setting, I could check the data, for example, mavros/imu/data by using rostopic echo /mavros/imu/data and there is CON: Got HEARTBEAT, connected. However, if I set the udp ports as the Wiki, there was a ROS Node, but no data flow. Maybe I confused with the udp setting, such as bind_host and remote_host. Some help?

1.1.3. Configuration of QGC

- `File` -> `Manage Communication Links` -> `Comm Links` 
- `Add` -> `UDP`  -> `Listenging Port` = 14556
- `Add` -> `Target Hosts` -> `locoalhost:14557`
- `Connect`

1.1.4. Configuration of Pixhawk

- `SYS_COMPANION` = 57600
- `SYS_AUTOSTART` = 1001

Question 2: In my opinion, the SYS_COMPANION should be 57600 due to the configuration, serialMAVLinkPort.open("/dev/ttyACM0", 57600, 8, 1, 0); , in Simulator.java file. Is that right ?

1.2 Waypoints Setting Steps

• Step 1: Run jUAVSim

java -cp lib/*:out/production/jmavsim.jar me.drton.jmavsim.Simulator

• Step 2: ROS Launch

roslaunch mavros px4.launch

• Step 3: Setting QGC as 1.1.3 mentioned.
• Step 4: ARM the Quadrotor
• Step 5: Set RC to AUTO|MISSION
• Step 6: Set the Waypoints using QGC
  

1.3 Comments

Above configurations work fine and stable. So I tried to test OFFBOARD mode.

□ 2. Pixhawk + jMAVSim + QGC+ ROS => HIL OFFBOARD

2.1. The basic setup is the same as Section 1.

2.2. Run jUAVSim and ROS launch got

CON: Got HEARTBEAT, connected.

2.3. Confirmed the SYS_COMPANION = 57600 due to the /dev/ttyACM0 device and SYS_AUTOSTART = 1001.

2.4. I armed Pixhawk with RC, got

[ INFO] [1433683902.311881904]: FCU: [inav] GPS signal found
[ INFO] [1433683905.572480505]: PR: parameters list received
[ INFO] [1433683940.627888497]: FCU: ARMED by RC
[ INFO] [1433683940.680076307]: FCU: home: 55.7533933, 37.6254292, -0.21
[ INFO] [1433683940.731902357]: FCU: [cmd] arming state: ARMED
[ INFO] [1433683940.783516048]: FCU: [sdlog2] log dir: /fs/microsd/log/2015-04-15
[ERROR] [1433683940.991716120]: FCU: TAKEOFF DETECTED
[ INFO] [1433683942.380224488]: FCU: [sdlog2] starting: 17_13_39.px4log
[ERROR] [1433683943.303710255]: FCU: LANDING DETECTED

2.5. I tried several ways

• RC switch by setting RC_MAP_OFFB_SW = 8 and switchthe chanle 8
• rosrun mavros mavsys mode -c OFFBOARD
• rosrun mavros mavcmd guided
  both got
  MSG: REJECT OFFBOARD

  Question 3: I am still not no the reason clearly why above setup failed to switch to OFFBOARD mode.

☑ 3. Pixhawk + mavlink/c_uart_interface_example

I am not sure whether my Pixhawk was borken, so I tested the c_uart_interface_example codes from
https://github.com/mavlink/c_uart_interface_example.

• Step 1: Login the System

screen /dev/ttyACM0 57600 8N1

• Step 2: Start mavlink session

nsh> mavlink start -d /dev/ttyACM0

Question 4: These dumping machine data should be HEARTBEAT ?

• Step 3: Start OFFBOARD control

./mavlink_control -d /dev/ttyACM0

and got

OPEN PORT
Connected to /dev/ttyACM0 with 57600 baud, 8 data bits, no parity, 1 stop bit (8N1)

START READ THREAD

CHECK FOR MESSAGES
\Found

GOT VEHICLE SYSTEM ID: 1
GOT AUTOPILOT COMPONENT ID: 50

INITIAL POSITION XYZ = [ 0.0000 , 0.0000 , -0.1444 ]
INITIAL POSITION YAW = -1.0061

START WRITE THREAD

ENABLE OFFBOARD MODE

SEND OFFBOARD COMMANDS
POSITION SETPOINT XYZ = [ -5.0000 , -5.0000 , -0.1444 ]
POSITION SETPOINT YAW = -1.0061
0 CURRENT POSITION XYZ = [  0.0000 ,  0.0000 , -0.1487 ]
1 CURRENT POSITION XYZ = [  0.0000 ,  0.0000 , -0.1692 ]
2 CURRENT POSITION XYZ = [  0.0000 ,  0.0000 , -0.1731 ]
3 CURRENT POSITION XYZ = [  0.0000 ,  0.0000 , -0.2105 ]
4 CURRENT POSITION XYZ = [  0.0000 ,  0.0000 , -0.1884 ]
5 CURRENT POSITION XYZ = [  0.0000 ,  0.0000 , -0.1781 ]
6 CURRENT POSITION XYZ = [  0.0000 ,  0.0000 , -0.1551 ]
7 CURRENT POSITION XYZ = [  0.0000 ,  0.0000 , -0.1496 ]

DISABLE OFFBOARD MODE

READ SOME MESSAGES
Got message LOCAL_POSITION_NED (spec: https://pixhawk.ethz.ch/mavlink/#LOCAL_POSITION_NED)
    pos  (NED):  0.000000 0.000000 -0.156523 (m)
Got message HIGHRES_IMU (spec: https://pixhawk.ethz.ch/mavlink/#HIGHRES_IMU)
    ap time:     67796216
    acc  (NED):  -1.475761  0.721853 -9.688719 (m/s^2)
    gyro (NED):  -0.004324 -0.002157  0.002136 (rad/s)
    mag  (NED):   0.250519  0.283799  0.188447 (Ga)
    baro:        998.889954 (mBar)
    altitude:    120.226318 (m)
    temperature: 49.309998 C

CLOSE THREADS

CLOSE PORT

Question 5: Whether above results means that the Pixhawk could working under OFFBOARD mode? And what is the different between this independent codes and the mavros based codes?

Any more help? @DrTon @Vavooon @LorenzMeier And I will read the codes of PX4 firmware and mavros for more detail?

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Now it is not necessary to disconnect the GPS in order to use HIL?
As I see when I change the value to 1001 from 6001 or disconnect the GPS I have to recalibrate sensors again in order to fly. I don't know if this have any solution?
I am using a firmware from last tuesday by downloading a new version of QGC and as I see it is better than previous that I had in position control. I would ask if the most recent firmware came with the QGroundcontrol and I have to download QGC again or that firmware is downloaded automatically from internet by QGC using the option update firmawe?
Thanks

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@alexanderceron In my setup, I did not connect GPS device with Pixhawk. Usually, I upgrade the firmware through QGC and choose the stable one.

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QGroundcontrol and I have to download QGC again or that firmware is downloaded automatically from internet by QGC using the option update firmawe?

qgc downloads firmware from internet each time, so even old qgc will flash fresh firmware.

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As I see when I change the value to 1001 from 6001 or disconnect the GPS I have to recalibrate sensors again in order to fly. I don't know if this have any solution?

Actually you don't need to switch to 1001 (HIL quad), HIL should work fine even with normal setups, e.g. 4001 for generic quad. Just make sure that LiPo is not connected, or no props mounted, just for safety :) HIL itself doesn't require any sensors calibration, because simulated sensors used anyway, but it may be a bug in PX4 so it does preflight check with real sensors even in HIL, not sure about this. @LorenzMeier, could you comment current state?

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It doesn't do preflight checks. And please make sure to use stable, not master. Master works in most cases, but in contrast to stable I'm not guaranteeing a smooth experience. All the QA efforts go into stable.

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@weiweikong
have you solve your issue?

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HI @weiweikong,
Seems that QGC---->Mavros communication is not stable now, as the Connection will be lost as soon as you connect to Mavros.

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Hi @weiweikong & @killerlayup ,
It seems that I could switch to OFFBOARD MODE, by using the commands:
rosrun mavros mavsafety arm followed by rosrun mavros mavsys mode -c OFFBOARD.
Once I run the demo app, I could see the quadrotor moving as the log shows:

iceicehyhy@iceicehyhy:~/catkin_ws$ ./setpoint_position_demo
[INFO] [WallTime: 1447259162.811083] Climb
[INFO] [WallTime: 1447259196.818033] Sink
[INFO] [WallTime: 1447259203.223879] Fly to the right
[INFO] [WallTime: 1447259211.428319] Fly to the left
[INFO] [WallTime: 1447259219.632792] Fly in a circle
[INFO] [WallTime: 1447259276.546952] Fly home
[INFO] [WallTime: 1447259311.765495] Bye!

[ INFO] [1447259163.113779739]: FCU: Flight mode: OFFBOARD
[ERROR] [1447259312.281050825]: FCU: failsafe mode on
[ INFO] [1447259312.332545828]: FCU: Flight mode: LAND
[ INFO] [1447259312.380169976]: FCU: [mpc] reset pos sp: 0, 0
[ INFO] [1447259312.432549006]: FCU: [mpc] reset alt sp: 0

I only face one problem now:
The communication between QGC and Mavros is not stable.

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@iceicehyhy nope
I have the same issue with yours

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@weiweikong
hi, i saw you listen to some rostopic during the simulation.
May i know which topic you're listening to? I've attached a pic for you reference.

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Sorry @iceicehyhy , I did not catch your point.
Usually, I listen mavros/local_postion/local to get the location of the drones; also some other topics are needed which depend on your application.

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@weiweikong ,
thx, i got it.

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