Proxy and NUS in one application

Question

Hi, 
 We are encountering a problem when we try to avail Nordic UART service (NUS) and Mesh service in one application. The problem statement is that after Provisioning, when we disconnect through the nRF Mesh application and go to nRF Connect application to use NUS, we can send only 20 Bytes of data. 
 But when we dump just the NUS code we availed the service of sending 244 Bytes of data. According to my knowledge there are two main functions in the main.c file of NUS, where the ATT packet size is set after the changes in sdk_config.h. 
 The first function is the 
 nrf_ble_gatt_init(&m_gatt, gatt_evt_handler); 
 2 nd function 
 nrf_ble_gatt_att_mtu_periph_set(&m_gatt, NRF_SDH_BLE_GATT_MAX_MTU_SIZE); 
 
 When I added these functions to the main.c file, I could send 244 Bytes of data, but the nRF Mesh application does not even initialize the connection with the DK and throws an app_error_weak.c . 
 
 Hence we are not in a position to provision the node and after disconnecting we cannot push 240 Bytes of data via the nRF Connect application. 
 
 We are using nRF52840 DK, on SES platform. 
 Mesh 2.2V along with 15.0.0. 
 Kind Regards, 
 Shrinidhi Bhat

Hung Bui · Accepted Answer

If you don't fully understand how BLE and the NUS service works, it's very hard for us to help you. I strongly suggest you to get to know how NUS works on both the nRF52 side and the Android/iOS side. Try to answer these questions: 
 - How does NUS send data from the nRF52 to the phone, using notification or write command ? 
 - How a notification can be enabled for sending (check CCCD) 
 - How does the phone send data down to the NRF52, using notification or write command ? 
 - Try to make your own app to connect to your nRF52, you can refer to the nRF Blinky app.

Proxy and NUS in one application

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