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We have tested till 5 simultaneous connection at a time. As per the controller is concern it can support more than that but we have not tested. User can try to connect more and check for the ability of simultaneous connections.
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I really wonder that you don't have exact number.
Because it is also a matter of internal memory availability to keep connections information. If you don't have enough memory - you are limited on connections (at least)
There should be some theoretical limit at least (even if it is not tested)
As I understood the chip is designed to support <8 connections 5 Connections garanteed (it might work for 6-7 for example)
But it is not possible to have 20+ BLE devices active (sensors/tags etc) Never