Ssh server. File transfers with protocol SCP and SFTP are available. Command line is also available (beta version). Command line needs "/system/bin/sh" preinstalled.

Intents:
com.theolivetree.sshserver.StartSshServerPro
com.theolivetree.sshserver.StopSshServerPro

To start the server automatically use application "Autostart and StaY!"
https://play.google.com/store/apps/details?id=com.atasoglou.autostartandstay
or also Tasker with the intents provided.

I have tested the server using:

*Secure file transfer:
WinSCP : http://winscp.net/
FileZilla : https://filezilla-project.org/

*Command line:
Putty : http://www.chiark.greenend.org.uk/~sgtatham/putty/download.html

Step 1. Download Ssh Server Pro Mod (Paid for free Free purchase) APK file on HappyMod.com.
Step 2. Once it's downloaded, open Downloads, tap on the APK file, and tap Yes when prompted.
Step 3.Ssh Server Pro Mod (Paid for free Free purchase) APK will begin installing on your device. Simple.

Step 1. Download HappyMod APK file on HappyMod.com.
Step 2. Once it's downloaded, open Downloads, tap on the APK file, and tap Yes when prompted.
Step 3.Search Ssh Server Pro Mod, click Download.
Step 4: You can download 100% working mods on HappyMod with one click.