termux

Termux is an Android terminal emulator and Linux environment application that works directly with no rooting or setup required. If you have a unused android phone, it’s easy to make it as a mini server.
Here is my experience about termux.

install

1. install F-droid, link
2. wait F-droid to update packages. after completely updated. search and install termux, termux::boot, termux::api

packages

pkg install sshd termux-services
sv-enable sshd
sv start sshd
pkg install termux-auth
set user passwd

Then you can ssh login your phone. the directory of termux is /data/data/com.termux/files/

Here are some packages I installed:
pkg install vim nginx termux-battery-status termux-api

it’s also a build environment. I also installed these:
pkg install dnsutils python cmake nlohmann-json ldd

I can send sms like this:

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termux-sms-send -n 95516 -s 0 aaa #use the first sim to send

boot

you can add your own programs to start at boot. Here are steps how to do it:

1. mkdir ~/.termux/boot/

2. add a file under ~/.termux/boot/ containing this:

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   #!/data/data/com.termux/files/usr/bin/sh termux-wake-lock . $PREFIX/etc/profile

3. Make your own pkg start as services

   1 2	mkdir -p $PREFIX/var/service/<PKG>/log ln -sf $PREFIX/share/termux-services/svlogger $PREFIX/var/service/<PKG>/log/run

   write a run script under $PREFIX/var/service/, you can refer to some examples existed in $PREFIX/var/service/.

   here is an example:

   1 2	#!/data/data/com.termux/files/usr/bin/sh exec python3 /data/data/com.termux/files/home/sms-fwd/sms-fwd.py 2>&1 > /dev/null

4. Some sv commands:

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   sv up <PKG> sv-enable <PKG> sv-disable <PKG>

battery

as a mini server, I want this phone would run without my operations. I need to disable battery optimization of termux, here are some steps:

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1. Navigate to Settings > Apps > Select your app.
2. Go to its Battery Saver section and choose No Restrictions.
3. Open the Security app and navigate to Battery.
4. Tap on the Settings icon located at the top right.
5. Select “Clear Cache when device is locked.”
6. Set it to Never.
7. Go to Settings > Apps > Select your app.
8. Navigate to the App Permissions section.
9. Disable the option “Pause app activity if unused.”
10. Launch the app and minimize it to keep it in the Recents Apps.
11. Access Recent Apps and long-press the preview window of the desired app.
12. Press the lock icon, effectively locking the app in the Recents Menu.
13. Navigate to Settings > About Phone.
14. Tap on Build Number seven times to enable Developer Options.
15. In Additional Settings, find and access Developer Options.
16. Tap on “Reset to Default Values” approximately 5-6 times.
17. This action will reveal the “Turn on MIUI Optimization” option. Disable it.

let phone charge automatically

There are some methods to do this, you can remove the battery and connect a DC 3.85v power source to the board directly. or you can use a Relay to control charging 2 hours every day. There are many modules selling online.

here is a module I am using

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