GATT CONN TIMEOUT

[mijiale]

Hi all

nrf52840 Development board,sdk is nRF5_SDK_15.2.0_9412b96,PC is windows 10

When I run the demo of ble_app_hrs on my development board,I use nrf connect app to connect my devcie,the connecting will disconnect.

From the nrf conenct we can see that the error is "GATT CONN TIMEOUT" and I print the log of the error code is 34 that express BLE_HCI_STATUS_CODE_LMP_RESPONSE_TIMEOUT

There is another point to pazzle me is that this situation only happens when I use the phone of HuaWei,other phones just like XiaoMi and HTC will not happen this situation.

[Simonr]

Hi

Error 133 is a known compatability error for a lot of Android phones, although we have mostly patched this problem, there still are some phones who gets this error. What Huawei model is it that you're using? I suggest you just use a phone that doesn't have this issue as there is no guaranteed fix. You could try adding some delays (buffers) after connection, to try and prevent this timeout, but this is not guaranteed to work.

Best regards,

Simon

[mijiale]

Hi,Simonr

Thank you very much for your reply.when I set the NRF_SDH_BLE_GATT_MAX_MTU_SIZE to 23,the connection will remain.If the value of NRF_SDH_BLE_GATT_MAX_MTU_SIZE is set larger than 23,the connection will break off.

[mijiale]

Other type of cell phone has “Data written to descr",but there don't have this message from Huawei.

[Simonr]

Hi

This is probably the same compatability error that caused the previous error. As I said we are working on patching this issue on all Android phones. Could you please specify which Huawei model you are using? Also do you know if the data write still happens even though you don't get the confirmation? 

Best regards,

Simon

[mijiale]

Huawei mate9,honor 9,Huawei P20 pro and so on. All Huawei phones used to test for me have this issue.