RNDIS Connection

[tom]

Using USB to Ethernet with VOXL

ModalAI technical documentation for VOXL and VOXL 2 Companion Computers for PX4 and ArduPilot Obstacle Avoidance and GPS-denied navigation, assembled in the USA

ModalAI Technical Docs (docs.modalai.com)

Not all usb to ethernet adapters are supported. A lot of people around the office use the apple ones but they have since been discontinued and are hard to find online so the other one I linked works as well.

[wilkinsaf]

@tom AAAHHHH

hence

Because not all are the same. Yes, that is what we mean. USB to Ethernet tethered. However, it appears that these are not all of the same. Some work and some don't.

We have a couple different here I can try. I wonder what makes the apple ones work in particular. Our goal is to try and get different modems working over USB. One provides RNDIS. Apparently another does usb to ethernet interface.

My knowledge on these network connections over usb is (obviously) novice.

Would you recommend looking through voxl-modem to see how a connection is made, or is there another informational page you recommend?

[wilkinsaf]

@wilkinsaf We are just attempting to understand how VOXL can make these network connections (bring up eth0 and such)

[tom]

@wilkinsaf Any sort of process used to support usb to ethernet is located at the kernel level (I believe). voxl-modem for example isn't used at all for bringing up a usb to ethernet dongle connection.

So if the usb to ethernet dongle is supported (we've only tried out a couple and stuck with ones that have worked for us), the network interface should "just come up" wihtout any intervention from voxl-modem

[tom]

I find using dmesg -wH super helpful when debugging usb devices as you can monitor which driver is picking up the hardware that is being plugged in and then you can inspect the driver itself if needed. Although, if the hardware is unrecognized by the kernel you may not see anything in dmesg

[wilkinsaf]

This is super helpful.

Thank you @tom. I will continue posting here for updates

[wilkinsaf]

@tom said in RNDIS Connection:

dmesg -wH

Apologies for the delay Tom.

I got some extra hardware and I am trying again to form RNDIS connection. I see the usb device and captured log from dmesg -wH command

[  +0.234046] usb 1-1: new high-speed USB device number 3 using xhci-hcd
[  +0.153446] usb 1-1: New USB device found, idVendor=1d6b, idProduct=0104
[  +0.000049] usb 1-1: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[  +0.000027] usb 1-1: Product: RNDIS Gadget
[  +0.000022] usb 1-1: Manufacturer: DTC
[  +0.000023] usb 1-1: SerialNumber: 0123678945
[  +0.059949] rndis_host 1-1:1.0 usb0: register 'rndis_host' at usb-xhci-hcd.0.auto-1, RNDIS device, ffffffc0ec10b610
[  +0.001060] mdss_register_panel: mdss mdp resource not initialized yet
[  +0.000047] mdss_wb soc:qcom,mdss_wb_panel: unable to register writeback panel
[  +0.012804] cdc_acm 1-1:1.2: This device cannot do calls on its own. It is not a modem.
[  +0.013688] wcd9335-slim tasha-slim-pgd: Platform data from device tree
[  +0.000347] wcd9335-slim tasha-slim-pgd: cdc-vdd-buck: vol=[1800000 1800000]uV, curr=[650000]uA, ond 0
[  +0.000082] wcd9335-slim tasha-slim-pgd: cdc-buck-sido: vol=[1800000 1800000]uV, curr=[250000]uA, ond 0
[  +0.000062] wcd9335-slim tasha-slim-pgd: cdc-vdd-tx-h: vol=[1800000 1800000]uV, curr=[25000]uA, ond 0
[  +0.000059] wcd9335-slim tasha-slim-pgd: cdc-vdd-rx-h: vol=[1800000 1800000]uV, curr=[25000]uA, ond 0
[  +0.000068] wcd9335-slim tasha-slim-pgd: cdc-vddpx-1: vol=[1800000 1800000]uV, curr=[10000]uA, ond 0
[  +0.000025] wcd9335-slim tasha-slim-pgd: Looking up qcom,cdc-micbias-ldoh-v property in node /soc/slim@91c0000/tasha_codec failed
[  +0.000025] wcd9335-slim tasha-slim-pgd: Looking up qcom,cdc-micbias-cfilt1-mv property in node /soc/slim@91c0000/tasha_codec failed
[  +0.002282] cdc_acm 1-1:1.2: ttyACM0: USB ACM device
[  +0.005805] wcd9335-slim tasha-slim-pgd: Looking up qcom,cdc-micbias-cfilt2-mv property in node /soc/slim@91c0000/tasha_codec failed
[  +0.000036] wcd9335-slim tasha-slim-pgd: Looking up qcom,cdc-micbias-cfilt3-mv property in node /soc/slim@91c0000/tasha_codec failed
[  +0.000030] wcd9335-slim tasha-slim-pgd: Looking up qcom,cdc-micbias1-cfilt-sel property in node /soc/slim@91c0000/tasha_codec failed
[  +0.000034] wcd9335-slim tasha-slim-pgd: Looking up qcom,cdc-micbias2-cfilt-sel property in node /soc/slim@91c0000/tasha_codec failed
[  +0.000020] wcd9335-slim tasha-slim-pgd: Looking up qcom,cdc-micbias3-cfilt-sel property in node /soc/slim@91c0000/tasha_codec failed
[  +0.000021] wcd9335-slim tasha-slim-pgd: Looking up qcom,cdc-micbias4-cfilt-sel property in node /soc/slim@91c0000/tasha_codec failed
[  +0.000180] wcd9335-slim tasha-slim-pgd: Looking up qcom,cdc-mic-unmute-delay property in node /soc/slim@91c0000/tasha_codec failed
[  +0.000040] wcd9335-slim tasha-slim-pgd: wcd9xxx_slim_probe: codec type is 2
[  +0.170558] wcd9xxx_slim_probe: failed to get slimbus tasha-slim-pgd logical address: -6
[  +0.003819] mdss_register_panel: mdss mdp resource not initialized yet
[  +0.000058] mdss_wb soc:qcom,mdss_wb_panel: unable to register writeback panel
[  +0.018967] wcd9335-slim tasha-slim-pgd: Platform data from device tree
[  +0.000134] wcd9335-slim tasha-slim-pgd: cdc-vdd-buck: vol=[1800000 1800000]uV, curr=[650000]uA, ond 0
[  +0.000034] wcd9335-slim tasha-slim-pgd: cdc-buck-sido: vol=[1800000 1800000]uV, curr=[250000]uA, ond 0
[  +0.000032] wcd9335-slim tasha-slim-pgd: cdc-vdd-tx-h: vol=[1800000 1800000]uV, curr=[25000]uA, ond 0
[  +0.000032] wcd9335-slim tasha-slim-pgd: cdc-vdd-rx-h: vol=[1800000 1800000]uV, curr=[25000]uA, ond 0
[  +0.000033] wcd9335-slim tasha-slim-pgd: cdc-vddpx-1: vol=[1800000 1800000]uV, curr=[10000]uA, ond 0
[  +0.000016] wcd9335-slim tasha-slim-pgd: Looking up qcom,cdc-micbias-ldoh-v property in node /soc/slim@91c0000/tasha_codec failed
[  +0.000011] wcd9335-slim tasha-slim-pgd: Looking up qcom,cdc-micbias-cfilt1-mv property in node /soc/slim@91c0000/tasha_codec failed
[  +0.000012] wcd9335-slim tasha-slim-pgd: Looking up qcom,cdc-micbias-cfilt2-mv property in node /soc/slim@91c0000/tasha_codec failed
[  +0.000013] wcd9335-slim tasha-slim-pgd: Looking up qcom,cdc-micbias-cfilt3-mv property in node /soc/slim@91c0000/tasha_codec failed
[  +0.000014] wcd9335-slim tasha-slim-pgd: Looking up qcom,cdc-micbias1-cfilt-sel property in node /soc/slim@91c0000/tasha_codec failed
[  +0.000011] wcd9335-slim tasha-slim-pgd: Looking up qcom,cdc-micbias2-cfilt-sel property in node /soc/slim@91c0000/tasha_codec failed
[  +0.000010] wcd9335-slim tasha-slim-pgd: Looking up qcom,cdc-micbias3-cfilt-sel property in node /soc/slim@91c0000/tasha_codec failed
[  +0.000011] wcd9335-slim tasha-slim-pgd: Looking up qcom,cdc-micbias4-cfilt-sel property in node /soc/slim@91c0000/tasha_codec failed
[  +0.000059] wcd9335-slim tasha-slim-pgd: Looking up qcom,cdc-mic-unmute-delay property in node /soc/slim@91c0000/tasha_codec failed
[  +0.000027] wcd9335-slim tasha-slim-pgd: wcd9xxx_slim_probe: codec type is 2
[  +0.156933] wcd9xxx_slim_probe: failed to get slimbus tasha-slim-pgd logical address: -6

not seeing the RNDIS interface, but I am going to look closer into this

[wilkinsaf]

Cool, lets see if I can actually talk over it

[tom]

@wilkinsaf Awesome! Looks like you've made some good progress

[wilkinsaf]

@tom Yes! we were able to make a connection! Thank you @tom