Add modprobe config to fix g_ether OTG ethernet on macOS/iPadOS

[ju-leon]

EEM mode is not supported by macOS or iPadOS. Setting use_eem=0 forces CDC Ethernet mode, which is compatible with both platforms.

This enables native streaming to Mac/iOS using the OTG port.

[henkwiedig]

sbc-gs does not use g_ether, a USB gadget is used.

I am suprised that this change does solve the issue for you, did you test this ?
My llm tells me we should rater user something like this:

diff --git a/board/common/overlay/usr/sbin/gadget b/board/common/overlay/usr/sbin/gadget
index 807a20d..79d55fb 100755
--- a/board/common/overlay/usr/sbin/gadget
+++ b/board/common/overlay/usr/sbin/gadget
@@ -81,17 +81,17 @@ uname -r > strings/0x409/manufacturer
 hostname -s > strings/0x409/product
 
 # 创建config1
-echo ">>>>>>>>>>>Create config1: ACM + Mass_Storage + NCM ......"
+echo ">>>>>>>>>>>Create config1: ACM + Mass_Storage + ECM (for macOS/iOS compatibility)......"
 mkdir -p configs/c.1/strings/0x409
 echo "0x80" > configs/c.1/bmAttributes
 echo 250 > configs/c.1/MaxPower
-echo "config1: ACM + Mass_Storage + NCM" > configs/c.1/strings/0x409/configuration
+echo "config1: ACM + Mass_Storage + ECM" > configs/c.1/strings/0x409/configuration
 
-# 创建NCM function
-echo ">>>>>>>>Create RNDIS ......"
-mkdir -p functions/ncm.usb0
-echo "$HOST_MAC" > functions/ncm.usb0/host_addr
-echo "$DEVICE_MAC" > functions/ncm.usb0/dev_addr
+# 创建ECM function (changed from NCM to ECM for macOS/iOS compatibility)
+echo ">>>>>>>>Create ECM for macOS/iOS compatibility......"
+mkdir -p functions/ecm.usb0
+echo "$HOST_MAC" > functions/ecm.usb0/host_addr
+echo "$DEVICE_MAC" > functions/ecm.usb0/dev_addr
 
 # 创建串口function
 echo ">>>>>>>>Create serial ......"
@@ -115,7 +115,7 @@ echo $MASS_FILE > functions/mass_storage.usb0/lun.0/file
 
 
 # 将对应function软连到c.1下面, 即启用该function，MAX 3 functions
-ln -s functions/ncm.usb0 configs/c.1/
+ln -s functions/ecm.usb0 configs/c.1/    # Changed from ncm.usb0 to ecm.usb0
 ln -s functions/acm.gs0 configs/c.1/
 ln -s functions/mass_storage.usb0 configs/c.1/
 # ln -s functions/ffs.adb configs/c.1/

This does work on linux. Can you verify on ios/Mac ? And maybe update your solution ?
Don't have hardware to test but out of curiosity: What applications do you use the stream to Apple devices ?

[ju-leon]

Tested on a RunCam WifiLink2 VRX. This fix allowed the devices to be discovered under macOS/iPad OS (both arm).

I’m certainly not an expert in this matter, I came across this solution based on this article:
https://medium.com/@donaldinos/usb-gadget-ethernet-on-radxa-zero-with-kali-linux-131352d90912

I’ll test your proposal on the weekend and come back to you!

Use-case:
Have a datalink from an iPad (running e.g. QGroundControl) to a UAV. Having a iPad as a ground station as VTX, telemetry and RC as an OpenSource alternative to what e.g. DJI offers with their drones (control, telemetry and video through the same link, connected to a tablet/phone on the ground)

[henkwiedig]

g_ether isn't even enabled in the buildroot image so how can this solve your issue.
What version of sbc-groundstation are you running ?
The buildroot snapshot or the old 2.0.0 beta or older ?

[henkwiedig]

Were you able to check this ?

[ju-leon]

Seems to work on the latest release out of the box -> closed