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I have a raspberry Pi 4B 4GB ram and I want to connect it to 16 Bluetooth oximeters(BLE) and take readings after every 20 secs.
Now I know that pi can connect to only 7-8 Bluetooth devices at a time so Can I use 2 USB Bluetooth adapters to connect to over 15 oximeters ?
If yes, is it a good solution?
If no, what else can I use/do?
In the Bluetooth spec there is no limit on the number of connections that can be made. However, in the real world, the Bluetooth hardware has constrained resources that have a practical limit to the number of simultaneous connections that can be maintained. By adding additional radios (USB dongles) then you should be able to raise the number of supported connections. There will be some overhead in your code to manage which dongle is connected to which oximeter but this should be relatively straight forward.
I would expect the BLE oximeters to share their readings via notifications. Maybe use a generic Bluetooth Low Energy scanning and exploration tool like nRF Connect to understand how the device is sharing its data
hci* part of the DBus path. More details can be found in the following answer: stackoverflow.com/a/63888028/7721752