Do any of the custom-built apps work reasonably well? I know that the last time I touched Bluetooth on phones (long ago) the stacks were so buggy that getting d

Do any of the custom-built apps work reasonably well? I know that the last time I touched Bluetooth on phones (long ago) the stacks were so buggy that getting different devices to communicate reliably was next to impossible. It would work for some devices, but cause issues with others etc. I would expect that any custom solution would be implemented by one of the few contractors experienced in dealing with the local bureaucracy, and would thus suffer from a lack of experience in dealing with Bluetooth and all the undocumented quirks. I wonder if that played into the decision.