Control SPI Wirelessly

Question

I would like to control a WaveShare e-Ink display wirelessly. I have lots of experience working with this type of device over SPI using the GPIO boards and the WaveShare python libraries.

I'd like to see if I can do something similar using a wireless module.

I've read about XBee, ZigBee, looked at at least half a dozen different AdaFruit development boards, but I'm a little bit lost. Any suggestions as to modules that can provide some of this functionality would be greatly appreciated.

The WaveShare e-Ink display uses the following pinouts.

|Pin   | SPI                                                       | 
|------|-----------------------------------------------------------|
| VCC  | 3.3V                                                      |
| GND  | GND                                                       |
| DIN  | SPI MOSI                                                  |
| CLK  | SPI SCK                                                   |
| CS   | SPI Chip Select (low active)                              |
| DC   | Data/Command control pin (High for data, low for command) |
| RST  | External reset pin (low for reset)                        |
| BUSY | Busy state (low for busy)                                 |

Answer 1

Get a second RPi connected to the display: that will be your "wireless" part. You can remotely access a display using X server protocol. This is typically done from an SSH session (see ssh -Y) or a reverse SSH tunnel, which will handle obscure X authentication mechanisms for you.

If you want to have control on SPI level, write your own protocol which allows sending individual SPI transactions. Note that it will be much slower, so such a display will likely be useless as a general-purpose screen.