This is the response that I got:
Handle is always unique. For single connection it can be 0x40 or 0x41. hello_client just references control block based on con_handle - 0x40 which can happen to be  or .
By default 20736/20737 supports 4 connections which can be bumped to 6 by calling
As for the second comment, one of the members in our team actually made connections with 8 peripherals before, which I think is the limit with Bluetooth low energy devices. But I heard from the developers that the more connections that you have, the more flaky the connections will be. So maybe keep the connection to between 4 or 6?
I hope this helps. Thanks.
The index starting point is not important.
The maximum connections are 8.
Thank you very much.
You are quite welcome.
Let us know if you run into other issues.