How to bind Radiomaster TX12Mk2 ELRS <> RP2 <> PX4

PX4 Autopilot
13 
NuttShell (NSH) NuttX-12.1.0
nsh> rc_input status
INFO  [rc_input] not running
nsh> rc_input start
INFO  [rc_input] valid device required
ERROR [rc_input] Task start failed (-1)
nsh> px4io status
protocol 5 hardware 2 bootloader 3 buffer 64B crc 0x6210128859
8 controls 8 actuators 18 R/C inputs 2 analog inputs
 px4io_status
    timestamp: 170512494 (0.435205 seconds ago)
    voltage_v: 0.0000
    rssi_v: 1.1380
    free_memory_bytes: 1464
    pwm: [900, 900, 900, 900, 0, 0, 0, 0]
    pwm_disarmed: [900, 900, 900, 900, 0, 0, 0, 0]
    pwm_failsafe: [0, 0, 0, 0, 0, 0, 0, 0]
    pwm_rate_hz: [400, 400, 400, 400, 50, 50, 50, 50]
    raw_inputs: [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0]
    status_arm_sync: True
    status_failsafe: False
    status_fmu_initialized: True
    status_fmu_ok: True
    status_init_ok: True
    status_outputs_armed: True
    status_raw_pwm: True
    status_rc_ok: False
    status_rc_dsm: False
    status_rc_ppm: False
    status_rc_sbus: False
    status_rc_st24: False
    status_rc_sumd: False
    status_safety_off: True
    alarm_pwm_error: False
    alarm_rc_lost: True
    arming_failsafe_custom: True
    arming_fmu_armed: False
    arming_fmu_prearmed: False
    arming_force_failsafe: False
    arming_io_arm_ok: True
    arming_lockdown: False
    arming_termination_failsafe: False


0 raw R/C inputs
ADC inputs 0 1616
features 0x0004 RSSI_ADC
sbus rate 72
debuglevel 0

INFO  [mixer_module] Param prefix: PWM_MAIN
control latency: 68109 events, 23192848us elapsed, 340.53us avg, min 327us max 1047us 33.516us rms
INFO  [mixer_module] Switched to rate_ctrl work queue
INFO  [mixer_module] Mixer loaded: yes
INFO  [mixer_module] Driver instance: 0
Channel Configuration:
Channel 0: value: 900, failsafe: 0, disarmed: 900, min: 1075, max: 1950
Channel 1: value: 900, failsafe: 0, disarmed: 900, min: 1075, max: 1950
Channel 2: value: 900, failsafe: 0, disarmed: 900, min: 1075, max: 1950
Channel 3: value: 900, failsafe: 0, disarmed: 900, min: 1075, max: 1950
Channel 4: value: 0, failsafe: 0, disarmed: 0, min: 1000, max: 2000
Channel 5: value: 0, failsafe: 0, disarmed: 0, min: 1000, max: 2000
Channel 6: value: 0, failsafe: 0, disarmed: 0, min: 1000, max: 2000
Channel 7: value: 0, failsafe: 0, disarmed: 0, min: 1000, max: 2000

is what I get…