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Error occurred while executing External Mode MEX-file 'ext_comm': Timed-out waiting for second connect response packet.

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I use the ttyACM0 ( COM3 port in my PC) to enable MAVLink and ttyS2( TELEM2 in PX4 and COM4 in my PC) for the external mode. The Following image is my model configuration setup :
1.png2.png
I was able to build the firmware successfully. However, when I run the external mode, it got a error and said the following ( compied from diagnostic windows) :
Program: [================== ] 90.6%
Program: [=================== ] 97.0%
Program: [====================] 100.0%
Verify : [ ] 1.0%
Verify : [====================] 100.0%
Rebooting.
### Successful completion of build procedure for model: px4_control_system_ver4
Build process completed successfully
host endian mode: Little
Component:Simulink | Category:Model
byte swapping required: false
Component:Simulink | Category:Model
action: EXT_CONNECT
Component:Simulink | Category:Model
Error occurred while executing External Mode MEX-file 'ext_comm': Timed-out waiting for second connect response packet.
Component:Simulink | Category:Block diagram error
Unable to connect to the 'PX4 Pixhawk 1' target for 'px4_control_system_ver4'.
Component:Simulink | Category:Model error
Can somebody help me to fix the problem.....plz

Answers (2)

Subhadra Mahanti
Subhadra Mahanti on 4 Sep 2019
Have you checked the baud rate? Make sure that it is in line with the external mode baud rate (921600).
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경민 박
경민 박 on 22 Jul 2022
I had same problem, and this is how I solved it.
In my case, I created new empty folder, and then in MATLAB I moved my Current Folder to that new empty folder.
Then it worked.

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