I am trying to control the drone via MAVSDK using Offboard mode in a GPS denied environment, but I encountered a problem. For position estimation I am using ArUco markers. I am sending the position information via MAVSDK using VISION_POSITION_ESTIMATE. I also set EKF2_AID_MASK and EKF2_HGT_MODE to Vision. I can see the position estimation that I am sending from MAVSDK in a QGroundControl, but I can not activate the Offboard mode nor any other mode that requires global position as I get information “No GPS Lock”. I tried to set global origin (mentioned here as necessary step to use auto modes Using Vision or Motion Capture Systems for Position Estimation | PX4 User Guide) and use “commander set_ekf_origin” in MAVLink shell from QGC, but it did not help. So at the moment I can see correct position sent to the drone via VISION_POSITION_ESTIMATE, but I can not switch to Offboard mode and get green color on the status LEDs.
Could you suggest any possible steps to try in order to enable Offboard mode without GPS in current situation? Maybe there is a necessary step that I am missing here or some other parameters need to be adjusted in PX4 via QGC.