Create AP_RCProtocol::FDM and AP_RCProtocol::UDP_Packed16BitValues

[peterbarker]

... and use them in SITL.

Do we really need to worry about the hand-over from port-5501 input to FDM so much?

i.e. if you manage to be sending packed values to port 5501 and then connect to the simulator - do you really expect to then get RC input from FlightAxis?

Tested "normal" SITL using sim_vehicle.py.

Tested the FDM input using FlightAxis.

[peterbarker]

Tested XPlane RC Inputs the same as master. Not quite, RC_Channels now reports correct number of channels:

Master:

RTL> 47: RC_CHANNELS {time_boot_ms : 1174135, chancount : 16, chan1_raw : 650, chan2_raw : 650, chan3_raw : 2333, chan4_raw : 1423, chan5_raw : 1420, chan6_raw : 1000, chan7_raw : 1000, chan8_raw : 1000, chan9_raw : 1000, chan10_raw : 0, chan11_raw : 0, chan12_raw : 0, chan13_raw : 0, chan14_raw : 0, chan15_raw : 0, chan16_raw : 0, chan17_raw : 0, chan18_raw : 0, rssi : 255}

This:

RTL> 46: RC_CHANNELS {time_boot_ms : 1418251, chancount : 9, chan1_raw : 650, chan2_raw : 650, chan3_raw : 2333, chan4_raw : 1423, chan5_raw : 1420, chan6_raw : 1000, chan7_raw : 1000, chan8_raw : 1000, chan9_raw : 1000, chan10_raw : 0, chan11_raw : 0, chan12_raw : 0, chan13_raw : 0, chan14_raw : 0, chan15_raw : 0, chan16_raw : 0, chan17_raw : 0, chan18_raw : 0, rssi : 255}

[peterbarker]

Board                    AP_Periph  blimp  bootloader  copter  heli  iofirmware  plane  rover  sub
CubeOrange-periph-heavy  *                                                                     
Durandal                            *      *           *       *                 *      *      *
Hitec-Airspeed           *                                                                     
KakuteH7-bdshot                     *      *           *       *                 *      *      *
MatekF405                           *      *           *       *                 *      *      *
Pixhawk1-1M-bdshot                  *                  *       *                 *      *      *
f103-QiotekPeriph        *                                                                     
f303-Universal           *                                                                     
iomcu                                                                *                         
revo-mini                           *      *           *       *                 *      *      *
skyviper-v2450                                         *                                       

[tridge]

i'd prefer UDP not whatever the heck this is