I use an OrangePi Zero Plus (about $20 with case, another couple of cents or so for a 12v > 5v step-down) running serial port json server with chilipeppr as my wireless interface. On the same Pi I have Laserweb/CNCWeb host and octoprint, but it took a little fettling.
I use TinyG/G2 with laser and CNC router and it is solid.
If I was going to use external drivers, I would use a Due with G2Core and appropriate shield, rather than a TinyG
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This reply was modified 6 years, 2 months ago by Zootalaws.