error 133 - bluetooth

[Roei]

Hi,

I'm using NRF52840 device to connect to a mobile via BLE.

Sometimes, I have error 133 and disconnection.

Can I initialize my BLE in a different way (characteristics etc...), in order to solve that issue?

Thanks!

[Hung Bui]

Hi Roei, 

Error 133 is a general error for multiple issues with Android, but the most common is the connection request is not received by the peer device. 

How often do you see the issue ? What exactly you observed when the issue occurred ?

Please try to capture a sniffer trace when the issue happens. 

[Roei]

Hi Hung!

I receive the disconnection with the error 133 after a few seconds of a successful connection (bonding).. the exact error is characteristicsRead Error 133 and sometimes it just disconnects without any error. is it only related to the Android device?

[Hung Bui]

Error 133 on characteristic read could related to att table being cached. This happens when you change the firmware of the device and the new firmware may have different attribute table. To avoid that you should try turn off an on Bluetooth. A phone restart may be needed as well. 
Please try to capture a sniffer trace.