What is the max concurrent Ble connections android M+ can have

Question

My app required to connect 9 Ble devices concurrently. In this article and any other resource it write that android 4.4+ can connect only to 7 devices. Is there anything new

Answer 1

It seems that those constants are global limits, and not per app. I am linking to the source of the BT stack in Android. I wonder why those constants are as they are... seem random.

#define GATT_MAX_PHY_CHANNEL 7

https://android.googlesource.com/platform/external/bluetooth/bluedroid/+/master/include/bt_target.h#1428

#define BTA_GATTC_CONN_MAX GATT_MAX_PHY_CHANNEL

https://android.googlesource.com/platform/external/bluetooth/bluedroid/+/master/bta/gatt/bta_gattc_int.h#89

tBTA_GATTC_CONN conn_track[BTA_GATTC_CONN_MAX];

https://android.googlesource.com/platform/external/bluetooth/bluedroid/+/master/bta/gatt/bta_gattc_int.h#424

NOTE

This is the official Android code. Up until Android 7.2 the vendors used to change that implementation a lot. The theory in Android 8 and above is that vendors should not modify it (not enough Android 8 devices on the field to see how this works in practice... at least at time of writing this reply).