Loopback, again

We can now test the Bluetooth module with minicom/PuTTY. Because this module doesn’t have LEDindicators for the transmission and reception events like the serial module did, we’ll test themodule using a loopback connection:

Just connect the module’s TXD pin to its RXD pin using a F/F wire.

Upon connecting, the blinking pattern of the Bluetooth module should change to: long pause thenblink twice quickly.