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Error when running programme on external Android

Asked by Kiat Nern Yeo on 7 Jun 2019
Latest activity Commented on by Kiat Nern Yeo on 19 Jun 2019
Hello all
I have encountered this error repeatedly, without being able to find a solution at all.
The test app by MATLAB Connector works perfectly fine.
The applications i create are able to run when uploaded using "deploy to hardware"
However, when the play button is pressed, the following error is obtained, as a result, i cannot read my android's sensor data in my MATLAB PC.
""
Error occurred while executing External Mode MEX-file 'ext_comm': Failed to connect to the target. Possible reasons for the failure: a) The target is not switched on. b) The target is not connected to your host machine. c) The application for the model is not running on the target. You might have clicked the Stop button. If the Run button is not dimmed, click it. Otherwise, click the Build button, which downloads and runs your application on the target. Caused by: An error occurred attempting to open an rtIOStream. More detail may be reported in the MATLAB command window
""
Any help is greatly appreciated.
Thank you !

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3 Answers

Answer by Kiat Nern Yeo on 10 Jun 2019
 Accepted Answer

Hi Sir
Yes i have used both the simulink display block, and the android data display, and have also set the mode to external and run time to inf.
Both these signals are coming out from the same android sensor block.
Best regards

  5 Comments

Hi Sir
Just an update, i tried running androidCommunicationExample again and i got the same error
Error occurred while executing External Mode MEX-file 'ext_comm': Failed to connect to the target. Possible reasons for the failure: a) The target is not switched on. b) The target is not connected to your host machine. c) The application for the model is not running on the target. You might have clicked the Stop button. If the Run button is not dimmed, click it. Otherwise, click the Build button, which downloads and runs your application on the target. Caused by: An error occurred attempting to open an rtIOStream. More detail may be reported in the MATLAB command window
Component:Simulink | Category:Block diagram error
Unable to connect to the 'Android Device' target for 'androidCommunicationExample'..
Please contact MathWorks technical support, they will help you resolve this issue.
Ok got it. Will call them. Thank you very much !

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Answer by Sruthi Yenugula on 7 Jun 2019

Hi,
Use this link to run the external mode
Make sure your device and pc are connected to same wifi network when running external mode.

  1 Comment

Yup i got it. The solution is to make sure that both devices are connected to the same private and secured network !

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Answer by Kiat Nern Yeo on 9 Jun 2019

Hi Sir. Thank you for replying
I have went through the example and the app can indeed be deployed onto my phone, and the sensor values can be read within my phone's screen.
However, it still does not show up in simulink's scope or display blocks.
I have also performed androidhwsetup, and the test app can run.
The USB cable is also always attached, and both the phone and computer are connected to the same private network.
I also have the proper android driver installed, along with the required android studio SDK and NDK.
Is there something that i could have missed ?
Best regards sir.

  2 Comments

To see the results in Simulink, you should run the model in external mode, make sure the simulation time is set to inf by default it is 10s. Use display block(not android data display ) of Simulink block is see the data in Simulink.
Yup i got it. The solution is to make sure that both devices are connected to the same private and secured network !

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