I really like the Fado MUD client for Android. I would like to have something similar on Anbernic. Especially cool that movement commands are tied to analog sticks, it’s very convenient.
I was able to get Tintin++ working fine on muOS. That + gptokeyb could likely get something similar, the only thing is many MUDs have different commands/controls so it would need to likely be tailored to the specific one you are connecting to.
It would be really cool to have such a thing formalized as an app 
I dream of it.
I can easily package it as a muxzip to install but, the main issues are
- There are many MUDs you can play on and they are all different
- Because of 1 there’s not really a good way to have a default config, it will essentially always be up to the user to do some config, like setting up the MUD details, if they want autologin, etc.
I can make you an archive that you can install that will launch Tintin+ in the included SimpleTerminal, which has an on-screen keyboard, but I don’t think you can use gptokeyb with SimpleTerminal because it is using most buttons already.
You could use sdlterm with gptokeyb, but no on-screen keyboard with that one.
I can even make one each way.
Tintin++ itself is just a command line program.
The main pain point is showing the command line in a nice way on-device. Both options ( SimpleTerminal and sdlterm ) have their limitations.
I had a similar situation with MUGEN/Ikemen-GO, where I can get it running, but there are many different “games” and such for it that are all different. Some work, some don’t, and people expect it to “just work” but that’s hard when there are so many different configurations.
It seems to me that at this point using SimpleTerminal without gptokeyb is the way to go