Herelink Air Unit USB Tethering

Hi,

I am building a system where I would like to use USB tethering on an Airunit.
The unit needs to connect like this:
PiZero2w(usb) → Herelink air unit (usb)(wireless) → herelink groundstation(wireless)(usb) → Laptop

I have one somewhat older Airunit laying around that directly creates an ethernet connection when I plugin the USB.
multiple newer Air units only show a “usb drive” on my laptop when I plug them in. I cannot find a solution how to enable the tethering on these air units…

The older airunit has Firmware AU01230714
The newer airunits have Firmware AU01220706

Kind regards,
Andreas

Meanwhile I found out that one can hack into the airunit via adb shell, and view/edit parameters.
(btw, on the older one WITH usb-thethering, the adb-shell does not work)

I think I have to change something in the parameter “sys.usb.state”, but not sure if it is safe/correct, and how I should change it.

via adb, it shows these parameters:

adb shell getprop
[dalvik.vm.boot-dex2oat-threads]: [4]
[dalvik.vm.dex2oat-threads]: [4]
[dalvik.vm.image-dex2oat-threads]: [4]
[dalvik.vm.isa.arm.features]: [default]
[dalvik.vm.isa.arm.variant]: [cortex-a15]
[dalvik.vm.isa.arm64.features]: [default]
[dalvik.vm.isa.arm64.variant]: [generic]
[dalvik.vm.lockprof.threshold]: [500]
[dalvik.vm.stack-trace-file]: [/data/anr/traces.txt]
[ffmpeg.force.decodersource]: [audio]
[gsm.serial]: [2S329Y002716]
[gsm.version.baseband]: [BUMBLEBEE.R03.T55-7181b844c-742b10f]
[init.svc.adbd]: [running]
[init.svc.connect_manager]: [running]
[init.svc.d2d_config]: [running]
[init.svc.debuggerd]: [running]
[init.svc.debuggerd64]: [running]
[init.svc.drone_id_read]: [running]
[init.svc.emsd]: [running]
[init.svc.ffmpeg_play]: [running]
[init.svc.flash_recovery]: [stopped]
[init.svc.gps-daemon]: [running]
[init.svc.gps_manager]: [running]
[init.svc.healthd]: [running]
[init.svc.init_logcontrol]: [stopped]
[init.svc.key_service]: [running]
[init.svc.keystore]: [running]
[init.svc.lampsignal]: [running]
[init.svc.leds-sh]: [stopped]
[init.svc.logd]: [running]
[init.svc.logd-reinit]: [stopped]
[init.svc.mavlink-router]: [running]
[init.svc.media]: [running]
[init.svc.mediacodec]: [running]
[init.svc.p2p_supplicant]: [stopped]
[init.svc.perfprofd]: [running]
[init.svc.rc_service]: [running]
[init.svc.rtsp_server]: [running]
[init.svc.servicemanager]: [running]
[init.svc.set-gsm-serial]: [stopped]
[init.svc.set-mass-storage]: [stopped]
[init.svc.set_cpu_sched]: [stopped]
[init.svc.song-elog-boot]: [stopped]
[init.svc.song-mla-manager]: [stopped]
[init.svc.song-oms-mla0]: [stopped]
[init.svc.song-oms-mla1]: [stopped]
[init.svc.song-oms-mla2]: [stopped]
[init.svc.song-oms-mla3]: [stopped]
[init.svc.song-oms-sa]: [running]
[init.svc.surfaceflinger]: [running]
[init.svc.system-control]: [running]
[init.svc.uavcamera_main]: [running]
[init.svc.ueventd]: [running]
[init.svc.usbethx]: [running]
[init.svc.vendorservice]: [stopped]
[init.svc.vold]: [running]
[init.svc.webservd]: [running]
[init.svc.webtools]: [running]
[log.tag.InCall]: [V]
[logd.logpersistd.enable]: [true]
[mali.hwc.flattener.enable]: [1]
[mali.hwc.flattener.interval]: [900]
[mali.hwc.rotation.size]: [69120]
[net.bt.name]: [Android]
[net.change]: [net.tcp.default_init_rwnd]
[net.tcp.default_init_rwnd]: [60]
[oem.buildnumber]: [AU01230714]
[persist.camera.keep.hdmi.on]: [true]
[persist.camera.module.info]: [back_camera=tele.lt6911c0,front_camera=tele.lt6911c1]
[persist.dbg.allow_ims_off]: [1]
[persist.fishlog.offline.enable]: [0]
[persist.fpv.device.id]: [10]
[persist.fpv.device.type]: [0]
[persist.hdmi.src.change]: [1]
[persist.ims.ut.enable]: [1]
[persist.logd.size.main]: [2M]
[persist.logd.size.radio]: [2M]
[persist.logd.size.system]: [2M]
[persist.radio.elog.path]: [1]
[persist.song.camera.mode]: [1]
[persist.song.connect.mode]: [1]
[persist.sys.button_jack_profile]: [volume]
[persist.sys.button_jack_switch]: [0]
[persist.sys.calls.on.ims]: [true]
[persist.sys.camera.hd]: [1]
[persist.sys.camera1.hd]: [1]
[persist.sys.d2d.auth.cfg]: [1]
[persist.sys.d2d.calibrated]: [60901]
[persist.sys.d2d.dl.bandwidth]: [5]
[persist.sys.d2d.dl.frequency]: [47685]
[persist.sys.d2d.key.pair]: [1]
[persist.sys.d2d.tx.pwr.cfg]: [23,20,20,20]
[persist.sys.d2d.ul.bandwidth]: [3]
[persist.sys.dalvik.vm.lib.2]: [libart.so]
[persist.sys.elog.auto.run]: [0]
[persist.sys.initial.pdp.type]: [3]
[persist.sys.power.optimize]: [1]
[persist.sys.proj.nvram.mode]: [5]
[persist.sys.song.check.imei]: [1]
[persist.sys.song.dual2single]: [1]
[persist.sys.song.dynamic.rat]: [1]
[persist.sys.song.log]: [/data/local/log,I1,0,0,I2,0,0,I3,0,0,I4,0,0,I5,0,0,I6,0,0]
[persist.sys.song.master.card]: [10]
[persist.sys.song.msms]: [111]
[persist.sys.song.standby.rat]: [7,3]
[persist.sys.strictmode.disable]: [true]
[persist.sys.usb.config]: [mass_storage,adb]
[persist.sys.web.status]: [0]
[persist.uart.1.baud]: [57600]
[persist.uart.1.mavlink]: [1]
[persist.uart.count]: [1]
[ro.allow.mock.location]: [0]
[ro.arch]: [song]
[ro.baseband]: [unknown]
[ro.board.platform]: [abies]
[ro.boot.board-id]: [33]
[ro.boot.configfs]: [1]
[ro.boot.corner-info]: [1]
[ro.boot.cpub-freq]: [3]
[ro.boot.cpuid]: [0x2108886c96afb4]
[ro.boot.cpul-volt]: [1]
[ro.boot.distance]: [0]
[ro.boot.gpu-volt]: [1]
[ro.boot.hardware]: [telepathy-air]
[ro.boot.link-lock]: [0]
[ro.boot.one-to-n]: [0]
[ro.boot.secureboot]: [0]
[ro.boot.selinux]: [permissive]
[ro.boot.serialno]: [e19135d0]
[ro.boot.soc-class]: [1]
[ro.boot.soc-id]: [1]
[ro.boot.soc-rev]: [1]
[ro.boot.soc-type]: [0]
[ro.boot.usbcontroller]: [fa300000.usb]
[ro.boot.verifiedbootstate]: [orange]
[ro.boot.veritymode]: [logging]
[ro.bootimage.build.date]: [Sat Jul 15 12:03:59 AEST 2023]
[ro.bootimage.build.date.utc]: [1689386639]
[ro.bootimage.build.fingerprint]: [CubePilot/song/song:7.1.2/N2G47J/AU01230714:userdebug/test-keys]
[ro.bootloader]: [unknown]
[ro.bootmode]: [unknown]
[ro.build.characteristics]: [nosdcard]
[ro.build.date]: [Sat Jul 15 12:03:59 AEST 2023]
[ro.build.date.utc]: [1689386639]
[ro.build.description]: [song-userdebug 7.1.2 N2G47J AU01230714 test-keys]
[ro.build.display.id]: [song-userdebug 7.1.2 N2G47J AU01230714 test-keys]
[ro.build.fingerprint]: [CubePilot/song/song:7.1.2/N2G47J/AU01230714:userdebug/test-keys]
[ro.build.flavor]: [song-userdebug]
[ro.build.host]: [cubepilot-MS-7B98]
[ro.build.id]: [N2G47J]
[ro.build.product]: [song]
[ro.build.tags]: [test-keys]
[ro.build.target]: [uav]
[ro.build.type]: [userdebug]
[ro.build.user]: [cubepilot]
[ro.build.version.all_codenames]: [REL]
[ro.build.version.base_os]:
[ro.build.version.codename]: [REL]
[ro.build.version.incremental]: [AU01230714]
[ro.build.version.preview_sdk]: [0]
[ro.build.version.release]: [7.1.2]
[ro.build.version.sdk]: [25]
[ro.build.version.security_patch]: [2017-04-05]
[ro.com.google.locationfeatures]: [1]
[ro.config.vc_call_vol_steps]: [11]
[ro.crypto.state]: [unencrypted]
[ro.debuggable]: [1]
[ro.dirac.acs.controller]: [afm]
[ro.dirac.acs.storeSettings]: [1]
[ro.dirac.afm.mode]: [global]
[ro.dirac.config]: [64]
[ro.dirac.poolsize]: [2]
[ro.expect.recovery_id]: [0xa7cb12ad9da7bcd800f0c7c5e8cbf9536e44882acf2a2ea0569434942e158f8f]
[ro.hardware]: [telepathy-air]
[ro.hwui.drop_shadow_cache_size]: [6]
[ro.hwui.gradient_cache_size]: [1]
[ro.hwui.layer_cache_size]: [48]
[ro.hwui.path_cache_size]: [32]
[ro.hwui.r_buffer_cache_size]: [8]
[ro.hwui.text_large_cache_height]: [1024]
[ro.hwui.text_large_cache_width]: [2048]
[ro.hwui.text_small_cache_height]: [1024]
[ro.hwui.text_small_cache_width]: [1024]
[ro.hwui.texture_cache_flushrate]: [0.4]
[ro.hwui.texture_cache_size]: [72]
[ro.opengles.version]: [196610]
[ro.product.board]: [telepathy]
[ro.product.brand]: [CubePilot]
[ro.product.brand.id]: [0]
[ro.product.cpu.abi]: [arm64-v8a]
[ro.product.cpu.abilist]: [arm64-v8a,armeabi-v7a,armeabi]
[ro.product.cpu.abilist32]: [armeabi-v7a,armeabi]
[ro.product.cpu.abilist64]: [arm64-v8a]
[ro.product.device]: [telepathy-air]
[ro.product.locale]: [zh-CN]
[ro.product.manufacturer]: [CubePilot]
[ro.product.model]: [Telepathy Air]
[ro.product.name]: [telepathy-air]
[ro.radio.use-ppp]: [no]
[ro.recovery_id]: [0xa7cb12ad9da7bcd800f0c7c5e8cbf9536e44882acf2a2ea0569434942e158f8f]
[ro.revision]: [0]
[ro.ril.modem.pb]: [0]
[ro.ril.oem.sno]: [2S329Y002716]
[ro.secure]: [1]
[ro.serialno]: [e19135d0]
[ro.sf.lcd_density]: [480]
[ro.sys.display.support]: [59]
[ro.sys.sdcardfs]: [1]
[ro.telephony.default_network]: [9]
[ro.wifi.channels]:
[security.perf_harden]: [1]
[selinux.reload_policy]: [1]
[service.adb.tcp.port]: [5555]
[service.bootanim.exit]: [0]
[status.battery.level]: [5]
[status.battery.level_raw]: [50]
[status.battery.level_scale]: [9]
[status.battery.state]: [Slow]
[sys.d2d.freq.hopping]: [0,0]
[sys.device.ip.address]: [192.168.0.10]
[sys.pinecone.usb.state]: [1]
[sys.restart.cm]: [0]
[sys.uav.cell_info]: [lte,0,47685,5,5,60901,0,0,-75,-102,-17,-17,7,34]
[sys.usb.config]: [mass_storage,adb]
[sys.usb.configfs]: [1]
[sys.usb.controller]: [fa300000.usb]
[sys.usb.ffs.ready]: [1]
[sys.usb.state]: [mass_storage,adb] <---------------------------------------------
[vold.has_adoptable]: [1]
[vold.post_fs_data_done]: [1]
[wifi.interface]: [wlan0]

make sure you set the usb ID pin correctly.