How to make 51822 not discoverable to phone

[sword]

Hi, I have 52832(ble_app_multilink_central 12.2) which is connected to 5 51822 (experimental_ble_app_blinky) modules. How to make 51822 not discoverable or not connectable to phone/tablet(android/ios )?

[Wojtek]

What you can do is:

• directed advertising on those 5x 51822 (so only 52832 receives adverts)
• whitelisting 52832 for connection to those 51822
• blacklisting phones/tablets (stupid solution)

[sword]

There is no problem between 52832 and 51822 ,works fine.When 51822 is not connected ( not in a range ) to master it can be connected by phone.I don't want this.

I don't want any connection from the outside to the current working system.It must be closed system

[Wojtek]

Yes, that is why i proposed those 3 possible solutions. They are not perfect, but will work for most cases. Not all though ofc.

[Petter Myhre]

The common way to this is to whitelist the central in the five peripherals.

Then the peripheral will only accept connection requests from that specific central, and filter out any other.