Bluetooth connection and serial port sending

[xiaobai]

Now I come across such a problem, when the device is sending serial port data, at the same time to the mobile phone and bluetooth connection for related business processing, the bluetooth will be disconnected for a timeout.Now suspect is due to the serial port send interrupt events caused, what can be resolved?

[Sigurd]

1) What SDK version are you using ?
2) What IDE / Toolchain are you using ?
3) Have you tried debugging in your IDE? Are you entering the APP_ERROR_HANDLER() with a error-code ?
4) Are you using a custom board or a nRF52-DK ?
5) Do you get the disconnect timeout on the nRF52, BLE_GAP_EVT_DISCONNECTED with reason BLE_HCI_CONNECTION_TIMEOUT ? Or do you get the timeout on the peer(e.g. mobile phone) ?

[xiaobai]

（1）The SDK version used is SDK15.3.0；

（2）The IDE used is Keil, version 5.15；

（3）Keil has been used for debugging, APP_ERROR_HANDLER() has only been used for initializing some services, and not elsewhere；

（4）Use a custom version, not a development board；

（5）Is the reason obtained in this disconnect event: BLE_HCI_CONNECTION_TIMEOUT.I think I lost the package or a few packets that are still connected are not sent out, resulting in the connection timeout.

There is a certain relationship with serial port, because as long as I am connected with bluetooth, the serial port will send big data will appear the problem I described above.So, now you want to know how to solve this problem?