Bluetooth Concurrent connection
2- Can we not have concurrent connections in case of Bluetooth?


Yes concurrent connections are possible, but not every BT/BLE chip supports this. You will need to check the reference manual of the BT/BLE chip of the central device to see whether your particular chip supports this. You did not state whether your laptop is the central or peripheral device in your scenario; the central is the device which initiates the connection.


  1- Right now I do this connection/disconnection manually. How do I automate it?


Which part of the procedure do you mean? On the microcontroller: write firmware to do it. On your laptop: write software to do it. For more specific advice you will need to provide more details. Like whether you are using BT Classic or Low Energy, whether your laptop is the central device in this scenario, what bluetooth-chips your devices are using, which operating system is running on your laptop,....