nRF52 SDK14.2 ble_app_uart (peripheral) example not working

[timmey9]

I downloaded SDK14.2 and loaded S132 v5.0 and then compiled and loaded the ble_app_uart example code (I also tried the precompiled hex provided with the SDK).  It all compiles and loads just fine, but when I try to communicate with the bluetooth module using the nRF Toolbox app (on iOS),   it doesn't work.  In the nRF Toolbox app, the log says:

"Enabling notifications failed"

"Error Writing is not permitted."

I looked at the logs and I see that the BLE_GATTC_EVT_EXCHANGE_MTU_RSP event occurs for some reason.  This seems very similar to this question, so I tried all the recommendations from that thread without success.  I messed with the optimization and updated everything to S132 v5.1, which did not work.

Any ideas?

[Martin Lesund]

Hello Timmey9,

That is strange. It should work "out of the box".

Could you make sure you are following the right steps?

Could you try with the nRF Connect app?

Are you running on the nRF52 DK or a custom board?

[timmey9]

After reading through the instructions in the link, I think I followed the "right steps" but I'll go through it again.

I am using the BMD-350 eval board.  I originally loaded the uart example from SDK 11.0 using S132 v2.0 and it worked great.  So I know the hardware is functioning.  I didn't have any trouble until I switched to SDK 14.2.  I didn't try any of the SDKs in between.

I just downloaded the nRF Connect app and tried it.  It connected and the same BLE_GATTC_EVT_EXCHANGE_MTU_RSP event occurred.

[Martin Lesund]

Could you check if you have set re-pairing to true?

[timmey9]

Where do I set "re-pairing"?  I couldn't readily find it.