Connect JQ-BT to UART (e.g., /dev/ttyS0 or /dev/ttyAMA0 on Raspberry Pi).
If you are running an older OS, the device may not install automatically.
| Symptom | Possible Fix |
|---------|---------------|
| hciattach fails | Check baud rate match; ensure no other process uses UART |
| No response to AT commands | Loopback test: short TX-RX; verify 3.3V logic level |
| Connection drops | Increase UART buffer size; disable flow control mismatch |
| Can't enter data mode | Ensure +++ is not followed by CR/LF immediately |
| Device not discoverable | Send AT+ROLE=S and AT+RESET |
CSR chips are legacy. The best driver is often the CSR Harmony stack, but for basic functionality, Microsoft's driver is best. Advanced users can find csr8510-a10 driver on GitHub repositories.