SSH to Termux via ADB

termux_ssh.sh

#!/bin/bash
declare -a START_COMMANDS=('sshd' 'termux-wake-lock')
declare -a STOP_COMMANDS=('pkill\ sshd' 'termux-wake-unlock')

# https://stackoverflow.com/a/8483797
KEYEVENT_HOME=3
KEYEVENT_ENTER=66

# Set up the port forwarding
PORT=$(adb forward tcp:0 tcp:8022)

# Run Termux and start the SSH server
adb shell am start -n com.termux/.app.TermuxActivity
sleep 1
for c in "${START_COMMANDS[@]}"; do
    adb shell input text "$c"
    adb shell input keyevent $KEYEVENT_ENTER
done
adb shell input keyevent $KEYEVENT_HOME

# Connect to Termux's SSH server
ssh -p"$PORT" localhost

# Remove the port forward
adb forward --remove-all

# Run Termux and stop the SSH server
adb shell am start -n com.termux/.app.TermuxActivity
sleep 1
for c in "${STOP_COMMANDS[@]}"; do
    adb shell input text "$c"
    adb shell input keyevent $KEYEVENT_ENTER
done
adb shell input keyevent $KEYEVENT_HOME