NRF_ERROR_INVALID_STATE

[GPST]

We are using SoftDevice: sd132 v 5.0.

With event "BLE_GATTS_EVT_EXCHANGE_MTU_REQUEST", the function "sd_ble_gatts_exchange_mtu_reply" always return with "NRF_ERROR_INVALID_STATE": anyone having any idea of why is this happening?

Thanks in advance!

[Kenneth]

That is odd, the common issue is that the link is disconnected. Can it be that the connection handle is wrong (first parameter in 
sd_ble_gatts_exchange_mtu_reply()) or that other code in your project have already called sd_ble_gatts_exchange_mtu_reply()?

[GPST]

First parameter is 'p_ble_evt->evt.gatts_evt.conn_handle' and there is no other places to call this function.

We changed the 'ble-connection-tag' (from 1 to 0) and now it replies NRF_ERROR_INVALID_PARAM.

The only way to get NRF_SUCCESS is when we used the default value (23) for the second parameter is 23 (even changing the NRF_SDH_BLE_GATT_MAX_MTU_SIZE to 247)