< "A" fatal error occurs while processing MTU extension. "A" sdk12.3(s132_nrf52_3.1.0_softdevice.hex) 52832 Peripheral function "B" sdk15.2 52832 Central function > 0> SDH:DEBUG:sd_ble_enable: RAM start at 0x200056a8 0> APP:INFO:charge Example 0> APP:INFO:Start scanning for device name Cretam_Safety. 0> APP:INFO:Fast Advertising 0> APP:INFO:Multilink Example 0> APP:INFO:Peripheral connected 0> BLE_GATT:INFO:on_connected_evt(nrf_ble_gatt_t * p_gatt, ble_evt_t * p_ble_evt) 0> BLE_GATT:INFO:request ATT MTU 64 for conn_handle 0 0> APP_ERROR:ERROR:Fatal ===================================================== < "A" sdk12.3(s132_nrf52_3.1.0_softdevice.hex) 52832 Peripheral function "B" nRFTool -> UART on smartphone > 0> APP:INFO:Peripheral connected 0> BLE_GATT:INFO:on_connected_evt(nrf_ble_gatt_t * p_gatt, ble_evt_t * p_ble_evt) 0> BLE_GATT:INFO:request ATT MTU 64 for conn_handle 0 0> BLE_GATT:INFO:EXCHANGE_MTU_RSP effective ATT MTU is 64 for conn_handle 0 0> APP:DEBUG:ATT MTU exchange completed. central 0xf7 peripheral 0x40 ===================================================== < "B" sdk15.2(s132_nrf52_6.1.0_softdevice.hex) 52832 Central log > ble_scan: Connecting 0> ble_scan: Connection status: 0 0> nrf_ble_gatt: Requesting to update ATT MTU to 100 bytes on connection 0x0. 0> app: Connection 0x0 established, starting DB discovery. 0> ble_db_disc: Starting discovery of service with UUID 0x1 on connection handle 0x0. 0> app: Start scanning for device name SafetyElectronic. 0> ble_scan: Scanning 0> nrf_ble_gatt: Peer on connection 0x0 requested an ATT MTU of 64 bytes. 0> nrf_ble_gatt: Updating ATT MTU to 64 bytes (desired: 100) on connection 0x0. 0> app: LBS central link 0x0 disconnected (reason: 0x8) 0> app: Start scanning for device name SafetyElectronic. 0> ble_scan: Scanning