Change UDP communications address to localhost from '192.168.46.2'.

[straycat11]

Hello,
I have a Simulink model of a quadcopter which has the required infrastructure to send data to and receive from PX4 sitl. I connect the s-function block, the model compiles successfully; however, UDP communication is not established.

I changed the following line in PX4Main.c from:

_server.sin_addr.S_un.S_addr = inet_addr("192.168.46.2");
to
_server.sin_addr.S_un.S_addr = inet_addr("127.0.0.1");

I create the mex file using 'BuildPX4Interface.m'.

I am not using a Ubuntu machine to run the px4 software by the way. It simply runs as a separate window after I type 'make px4_sitl none'. The only message after I am getting 'Simulator connected on TCP port 4560.' is

ERROR [simulator] poll timeout 0, 111

Thanks in advance.

[straycat11]

I was in fact able to change the ip to 'localhost' and managed to get a connection. The problem had stemmed from the interface being designed for a previous version of PX4 Firmware. I installed 'PX4.Windows.Cygwin.Toolchain.0.5' and checked out release v1.8.2. The problem I am having now is not the sensor data not being synchronous. I am getting the following errors:
...

WARN [sensors] Remaining sensors after failover event 0: Accel #0 priority: 1
WARN [sensors] Remaining sensors after failover event 0: Accel #1 priority: 1
ERROR [sensors] Gyro #0 fail: TIMEOUT!
ERROR [sensors] Sensor Gyro #0 failed. Reconfiguring sensor priorities.
WARN [sensors] Remaining sensors after failover event 0: Gyro #0 priority: 1
ERROR [sensors] Accel #0 fail: TIMEOUT!
ERROR [sensors] Sensor Accel #0 failed. Reconfiguring sensor priorities.
WARN [sensors] Remaining sensors after failover event 0: Accel #0 priority: 1
WARN [sensors] Remaining sensors after failover event 0: Accel #1 priority: 1

...

I tried running my Simulation running at 250 Hz (It used to run at 480 Hz); however, it did not solve the problem.

[aogrcs]

Could you give me a tutorial about how to write s-funtion for IMU block, thanks!
@straycat11