App inventor BLE error:Connection status was set to OS code 133

[freeway]

Hi, everyone
The phone can scan Bluetooth devices normally, but the connection fails. Return as 133 error：Connection status was set to OS code 133

BLE Extended Version：20230728

[ABG]

There is a newer version at

FAQ Section: BlueTooth/BLE

BLE Releases BluetoothLE extension 20240822 Java 11 UUID bugfix - @ewpatton BluetoothLE extension 20240322-beta bugfix - ewpatton BluetoothLE extension 20230728 released - ewpatton BluetoothLE extension 20201223 released - ewpatton BluetoothLE extension 20200828 released - ewpatton BluetoothLE extension 20190701 released - EWPatton BLE Problems How to clean out residual BLE extension parts - ewpatton How to send text longer than 20 bytes - ChrisWard WriteStrings is fixed to 23 Bytes a…

[freeway]

The version has been updated, but the phenomenon is still the same

[ABG]

See

BLE connection failure esp32 Arduino 10

Thank you for your fast answer, it really help me solving the problem. First I implemented all your recommendations in app inventor application. That did not change anything to the problem but I will keep them in my final app as "best practices". Next, I thought about your comment on the MTU size. On the ESP32 code, I changed the "advertizing" long name (19 ascii bytes) to fairly short name (3 char). Connection is now successfull both on the small Arduino IDE demo app as well as my quite large…

If that doesn't help, export and upload your .aia and your sketch.

[freeway]

I use other. aia in other posts ... still the same