If you decide to use FlySky-i6s to send control signals via RC, please note the following:

• configure RC output to be PPM & i-Bus in the system config menu & make sure it is already bounded to the receiver.
• All you need is to wire 3 pins: ground (don't forget ground), 5V, and PPM. Remember, to POWER the receiver from external source; i.e. TTL cable.
• Note that current configuration by default ignores every other 9 frames, which could be adjusted by changing MAX_FRAMES_TO_COLLECT. This is needed because PPM frames are coming fast; & this is needed to reach steady state quickly else flickering states will be reported (especially for buttons)
• When decoding iBus, for some reason you have may have to reset the Rx & unplug the wires and plug them back in few times.
• Also note that if you use SD-Card; you may have to power the receiver externally and not directly powered from the board's pins (unless the board is powered externally and not via USB cable).