Datasheet

No, on SPI-based boards the IRQ pin is used to indicate that an SDEP response is

available to an SDEP command. For example, when you sent the `AT+BLEUARTRX`

command as an SDEP message, the Bluefruit firmware running on the nRF51822 will parse

the message, prepare an SDEP response, and trigger the IRQ pin to tell the MCU that the

response is ready. This is completely independant from the BLE UART service, which

doesn't have interrupt capability at present.