As a backer of digispark in the past, I got a notice of their new kickstarter project (OAK) which some 32-bit MCO, has wifi (presumably similar to the ESP8266), and is programmable via wifi, and it uses rootcloud as the glue with a $13 unit price. Now, I have some issues with Oak (for an IOT type server, it is restricted due to number of pins, particularly one analog; in some places you might not have general wifi access, and in the past digistumps record for software support hasn't impressed me, and what happens if rootcloud goes belly up).
As I was thinking about it, in a Teensy context, I could imagine the Mini54 being replaced with something that does wifi, ala the ESP8266, and then connect the Teensy 4.0/3.2/3.1++ (or whatever) to that. Obviously you would need to do FCC compliance, etc. But it would answer the people that have a need/desire to remotely upgrade their Teensy's software.
Perhaps it might be as simple as having 2 pins/solder pads dedicated to a UART connection that we could add our own ESP8266's, and the MINI54++ would talk to the ESP8266, and provide it as another serial channel to the Teensy 4.0/3.2/3.1++, and have some EEPROM in the Mini54++ to remember connection information.
Great Idea..
this would make it possible to build a complete webradio in Teensy-size ;-)
But, the WLAN needs much current, so an on-board power supply for Wlan is needed. In addition, an antenna (perhaps on the backside? Could that work ? ), and the ESP needs an "external" flash-chip too.
I wonder if all this is possible with this small form factor..
But hey, it would be a dual-cpu board.. (where both are programmable) Fantastic !