Datasheet

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# To send multiple bytes

[D6:4E:06:4F:72:86][LE]> char-write-cmd 0x000B 707172737475

# If you are running the callbackEcho sketch and notifications

# are enabled you should get this response after the above cmd:

Notification handle = 0x000d value: 70 71 72 73 74 75

--------------

# If you just want to enable constant listening, enter the following command from the CLI:

$ sudo gatttool -b D6:4E:06:4F:72:86 -t random --char-write-req -a 0x000e -n 0100 --listen

# This should give us the following output as data is written on the Uno,

# though we can't send anything back:

Characteristic value was written successfully

Notification handle = 0x000d value: 74 65 73 74

Notification handle = 0x000d value: 6d 6f 72 65 20 74 65 73 74

Can I use the IRQ pin to wake my MCU up from sleep when BLE UART data is available?

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.