What kind of bluetooth communication method should I use contact with third party application?

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I am using nRF5340 and am totaly newbee at nRF environment as well as ble. There is an example shared by nRF that allows send data that received from BL over UART and vice versa. This example is working with nRF connect BL serial port emulator and other 3rd party tool but my goal is connecting to 3rd party applications that can send positioning data over Bluetooth. However, My device is not connecting to these applications with this example. Is BL serial correct way ? Do I have to add something to code ? Modifying these apps is not possible btw. I am open to any suggestion from anyone who got familiar with nRF5340 or nRF environment.

I need a GNNS app to get positioning data to send my nRF5340 custom board via Bluetooth. So, I used peripheral_uart example. My goal is to send data I received from BL to my another MCU in the board. I tested this code snippet with nRF's own BL serial terminal and it is working, also tested 3th party BL Seril Port app that can regocnize nRF devices. But could not manage to communicate with other GNSS BL applications on the market.

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