Scripts for setting up the Serial and Ethernet OTG USB

Scripts/gadget.sh

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+# Adapted from
+# "Using OTG mode on Raspberry Pi SBCs"
+# https://pip-assets.raspberrypi.com/categories/685-app-notes-guides-whitepapers/documents/RP-009276-WP/Using-OTG-mode-on-Raspberry-Pi-SBCs
+sudo modprobe libcomposite
+cd /sys/kernel/config/usb_gadget
+# Create our new gadget
+sudo mkdir MyGadget
+cd MyGadget
+# Add some boilerplate data that the gadget needs
+echo 0x1d6b > idVendor # Linux Foundation’s USB VID. Replace with your own VID if required
+echo 0x0104 > idProduct # Multifunction Composite Gadget
+echo 0x0100 > bcdDevice # v1.0.0
+echo 0x0200 > bcdUSB # USB2
+mkdir strings/0x409 # 0x409 = English
+# Insert your own manufacturer and gadget name here
+echo "RaspberryPi" > strings/0x409/manufacturer
+echo "MyPiGadget" > strings/0x409/product
+# Make the serial number the same as the Raspberry Pi serial number; you can use whatever is required here
+SERIAL=`cat /proc/cpuinfo | awk '/Serial/ {print $3}' `
+echo $SERIAL > strings/0x409/serialnumber
+# Create a configuration area and populate
+mkdir configs/c.1
+echo 120 > configs/c.1/MaxPower
+mkdir configs/c.1/strings/0x409
+echo "Config 1" > configs/c.1/strings/0x409/configuration
+
+# Create our specific gadget type
+## Mass storage device
+###  Remember to create the storage block device first
+##  cd /root
+### Example: Make a 256 MB file to act as "USB stick"
+##  sudo dd if=/dev/zero of=drive.bin bs=1M count=256
+### Create a VFAT file system on the backing store
+##  sudo mkfs.vfat drive.bin
+##
+# mkdir functions/mass_storage.usb0
+## Set up our backing store
+# echo "/home/pi/drive.bin" > functions/mass_storage.usb0/lun.0/file
+## Link our function to our configuration
+#ln -s functions/mass_storage.0 configs/c.1/
+
+## Serial (CDC ACM)
+mkdir functions/acm.usb0
+ln -s functions/acm.usb0 configs/c.1/
+
+## Ethernet (RNDIS and ECM)
+mkdir functions/ecm.usb0
+ln -s functions/ecm.usb0 configs/c.1/

Scripts/serial-ether-gadget.service

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+[Unit]
+Description=Serial and Ethernet over OTG USB
+After=systemd-user-sessions.service
+[Service]
+ExecStart=/root/rover-pi/Scripts/gadget.sh
+[Install]
+WantedBy=multi-user.targe