By placing the Flora BLEFriend module in 'UART Data' mode (set the mode selection switch to DATA or setting the MODE pin to gound) you can use the module as a 'tranparent UART connection' to the Bluefruit app. This makes data transfer super simple. Data is sent to the app when any 9600 baud data is received on the RX pin and any data from the app is automatically transmitted via the TX pin to your Flora

You can determine if you are in Data Mode by looking at the mode LED.  It should blink two times followed by a three second pause, as shown below:

You can then connect the the app in UART mode and send/receive data transparently

Switching Command/Data Mode via +++

On either side of the connection (via the Flora or in your mobile app), you can dynamically switch between command and data mode by sending the "+++\n" string, as detailed in the +++ command summary.

If you start in data mode, you can send text for example, with "+++\nATI\n+++\n", which will cause the Bluefruit LE module to switch to command mode, execute the ATI command, and then switch back to data mode.

The +++ command can be sent from either side, making it possible to execute commands from the mobile application as well as on the Bluefruit LE side.
# Start in Data Mode
> Hello, World! Data mode!
# Send command to switch modes
> +++
# Bluefruit LE module switches to CMD mode
# Send ATI command and wait for the response
< nRF51822 QFAAG00
< B122AAC33F3D2296
< 0.6.2
< 0.6.2
< May 01 2015
< OK
# Switch back to DATA mode
> +++
< OK
# We're back in data mode now
Welcome back!

This guide was first published on May 12, 2015. It was last updated on May 12, 2015.

This page (Data Mode) was last updated on May 11, 2015.

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