Add VOXL2 IO board UART passthru feature

[katzfey]

This PR adds the UART passthru feature that is currently already in the voxl_esc driver into the voxl2_io board driver. This PR also adds limits to the feature for both voxl_esc and voxl2_io so that it cannot be done faster than 20Hz.

This PR replaces closed PR 24448

[github-actions]

🔎 FLASH Analysis

px4_fmu-v5x [Total VM Diff: 80 byte (0 %)]

    FILE SIZE        VM SIZE    
--------------  -------------- 
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  +0.0%     +20  +0.0%     +20    [section .text]
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   +14%     +16   +14%     +16    MavlinkReceiver::handle_message_tunnel()
  [NEW]     +16  [NEW]     +16    __orb_io_serial_passthru
  +2.2%     +12  +2.2%     +12    MavlinkReceiver::CheckHeartbeats()
  +1.1%      +8  +1.1%      +8    MavlinkReceiver::~MavlinkReceiver()
  +2.0%      +4  +2.0%      +4    MavlinkReceiver::print_detailed_rx_stats()
  +1.5%      +4  +1.5%      +4    MavlinkStreamAutopilotStateForGimbalDevice::send()
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  -0.8%      -8  -0.8%      -8    MavlinkReceiver::handle_message_hil_state_quaternion()
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 -50.0%     -16  [ = ]       0    MavlinkStreamAutopilotStateForGimbalDevice::send()
   +33%     +16  [ = ]       0    MavlinkStreamBatteryInfo::send()
  [NEW]     +32  [ = ]       0    __orb_io_serial_passthru
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-0.9%     -80  [ = ]       0    [Unmapped]
+0.0% +3.93Ki  +0.0%     +80    TOTAL

px4_fmu-v6x [Total VM Diff: 88 byte (0 %)]

    FILE SIZE        VM SIZE    
--------------  -------------- 
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  +0.0%     +20  +0.0%     +20    [section .text]
  +1.2%     +16  +1.2%     +16    MavlinkReceiver::MavlinkReceiver()
   +14%     +16   +14%     +16    MavlinkReceiver::handle_message_tunnel()
  [NEW]     +16  [NEW]     +16    __orb_io_serial_passthru
  +2.2%     +12  +2.2%     +12    MavlinkReceiver::CheckHeartbeats()
  +1.1%      +8  +1.1%      +8    MavlinkReceiver::~MavlinkReceiver()
  +2.0%      +4  +2.0%      +4    MavlinkReceiver::print_detailed_rx_stats()
  +1.5%      +4  +1.5%      +4    MavlinkStreamAutopilotStateForGimbalDevice::send()
   +50%      +4   +50%      +4    Zero
  +5.6%      +4  +5.6%      +4    fmodf
   +44%      +4   +44%      +4    g_nullstring
  +0.3%      +4  +0.3%      +4    uorb_topics_list
  -1.3%      -4  -1.3%      -4    Mavlink::send_finish()
 -16.7%      -4 -16.7%      -4    get_orb_meta()
  -3.0%      -4  -3.0%      -4    uORB::Manager::orb_device_node_exists()
  -2.9%      -4  -2.9%      -4    uORB::Manager::orb_exists()
  -0.8%      -8  -0.8%      -8    MavlinkReceiver::handle_message_hil_state_quaternion()
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  +200%      +4  [ = ]       0    [Unmapped]
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  [DEL]      -2  [ = ]       0    [Unmapped]
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  [NEW]     +25  [ = ]       0    __orb_io_serial_passthru
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   +50%     +16  [ = ]       0    MavlinkReceiver::handle_message_obstacle_distance()
 -50.0%     -16  [ = ]       0    MavlinkReceiver::handle_message_tunnel()
 -50.0%     -16  [ = ]       0    MavlinkStreamAutopilotStateForGimbalDevice::send()
   +33%     +16  [ = ]       0    MavlinkStreamBatteryInfo::send()
  +0.3%     +32  [ = ]       0    [section .symtab]
  [NEW]     +32  [ = ]       0    __orb_io_serial_passthru
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-1.4%     -88  [ = ]       0    [Unmapped]
+0.0% +3.83Ki  +0.0%     +88    TOTAL

Updated: 2026-02-07T19:16:48

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud