How is Bluetooth app support different from basic pairing?
An app needs an interface for the operation it wants to perform. That can involve device services, commands and permissions beyond the operating system's paired-device list. Both the device and app must support the interaction.
A connection needs a shared protocol
Describe the payload as well as the transport. Sending text, receiving a button event and capturing audio are different operations. A Bluetooth connection can be working while one of those operations is absent from the available application interface.
A prototype that discovers the device but cannot update its display should next look for the documented display command and connection requirements. The solution may be the correct SDK or app session, not another attempt to pair. This distinction keeps low-level discovery from being mistaken for application readiness.
Sources
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