Hello Husnul Fazari.

By default de connection timeout is 5 seconds, I assume that your connection is taking longer than that.

I recommend you to update the BLE Plugin version, if you didn't do it already. This new version allows you to increase the timeout dinamically.

Hope it helps.
JS.

Hello Jose, 

I was already using the latest version of the BLE plugin and tried to set the timeout up to 1min, but still, it shows a timeout error.

I am shared my oml file here, please let me know if I did anything wrong

Hello Husnul,

I changed some stuff on your demo module.

Try out the attached version.

I removed the characteristic you had on the connect (FEE04).
The scan can be called on demand istead of using the BT listener.

PS: Make sure you allow the connection of the target device if applied.

Hope it helps.

JS.