What is the maximum number of slaves in BLE star network?

[haiou]

hi all,

    I am currently working on a ble project, the led based on the NRF52832 chip is used as the slave, and the mobile phone is used as the master to form a star network of 1master 64 (or more) slaves. I want to evaluate whether this can be achieved, and also want to know what is the maximum number of slaves connected by the master? Hope to get your help，thank you

[Hung Bui]

Hi Haiou, 

Please be aware that Nordic chip in general are not inside the phone. 

The Nordic chip usually implemented on the device/slave side not on the phone. 

So it's hard to say if the phone would support 64 connections concurrently or not. 

What I would suggest is to use one NRF52 device to work as the master and connect to 20-64 slaves. And then use the phone to connect to this single master to control the other slaves. 
You can also think of another option is to use Bluetooth Mesh for your application. 

You have two options for the BLE controller. The Nordic Softdevice controller support up to 20 concurrent connections and the Zephyr controller support up to 64 connections. 

[haiou]

thank you Hung Bui , Is there any introduction about "Nordic Softdevice controller" and "Zephyr controller"？

[Hung Bui]

Hi Haiou,

I'm sorry for the late response. I was on vacation. You can have a look at the documentation here.