Flysky AFHDS 2A, protocol as used i10, i6, iT4,

INTV (0) // Internal Voltage
TEM (1) // Temperature
MOT (2) // RPM
EXTV (3) // External Voltage
CELL (4) // Avg Cell voltage
BAT_CURR (5) // battery current A * 100
FUEL (6) // remaining battery percentage / mah drawn otherwise or fuel level no unit!
RPM (7) // throttle value / battery capacity
CMP_HEAD (8) //Heading 0..360 deg, 0=north
CLIMB_RATE (9) m/s *100
COG (10) //Course over ground(NOT heading, but direction of movement) in degrees * 100, 0.0..359.99 degrees. unknown max uint
GPS_STATUS (11)
ACC_X (12) // m/s *100
ACC_Y (13) //m/s *100
ACC_Z (14) //m/s *100
ROLL (15) //deg *100
PITCH (16) // deg *100
YAW (17) // deg *100
VERTICAL_SPEED (18) // m/s *100
GROUND_SPEED (19) // m/s *100 different unit than build-in sensor
GPS_DIST (20) // dist from home m
ARMED (21)
FLIGHT_MODE (22) // simple index listed below


PRES (65) // Pressure
ODO1 (124) // Odometer1
ODO2 (125) // Odometer2
SPE (126) // Speed km/h
TX_V (127) // TX Voltage


//4 byte sensors
GPS_LAT (128) // WGS84 in degrees * 1E7
GPS_LON (129) //WGS84 in degrees * 1E7
GPS_ALT (130) // GPS alt m*100
ALT (131) // Alt m*100
ALT_MAX (132) //MaxAlt m*100
S85 (133)
S86 (134)
S87 (135)
S88 (136)
S89 (137)
S8a (138)


ALT_FLYSKY (249) // Altitude in m
SNR (250) // SNR
NOISE (251) // Noise
RSSI (252) // RSSI
ERR (254) // Error rate
UNKNOWN (255)

Needs RX firmware mod update

GPS_FULL (253)
VOLT_FULL (240)
ACC_FULL (239)