Datasheet

The reason behind the need for CTS and RTS is that the UART block on the nRF51822

isn't very robust, and early versions of the chip had an extremely small FIFO meaning that

the UART peripheral was quickly overwhelmed.

Using CTS and RTS significantly improves the reliability of the UART connection since

these two pins tell the device on the other end when they need to wait while the existing

buffered data is processed.

To enable CTS and RTS support, go into the BluefruitConfig.h file in your sketch folder

and simply assign an appropriate pin to the macros dedicated to those functions (they may

be set to -1 if they aren't currently being used).

Enabling both of these pins should solve any data reliability issues you are having with

large commands, or when transmitting a number of commands in a row.

How can I update to the latest Bluefruit LE Firmware?

The easiest way to keep your Bluefruit LE modules up to date is with our Bluefruit LE

Connect app for Android or Bluefruit LE Connect for iOS. Both of these apps include a

firmware update feature that allows you to automatically download the latest firmware and

flash your Bluefruit LE device in as safe and painless a manner as possible. You can also

roll back to older versions of the Bluefruit LE firmware using these apps if you need to do

some testing on a previous version.

Which firmware version supports 'xxx'?

We regularly release Bluefruit LE firmware images with bug fixes and new features. Each

AT command in this learning guide lists the minimum firmware version required to use

that command, but for a higher level overview of the changes from one firmware version

to the next, consult the firmware history page.

Does my Bluefruit LE device support ANCS?

ANCS is on the roadmap for us (most likely in the 0.7.x release family), but we don't

currently support it since there are some unusual edge cases when implementing it as a

service.

My Bluefruit LE device is stuck in DFU mode ... what can I do?

If your device is stuck in DFU mode for some reason and the firmware was corrupted, you

have several options.