Possible to completely disable networking/wifi/bluetooth?

82u · June 4, 2023, 1:50am

I am interested using/developing for Playdate. One thing is important, though. Is it possible to completely disable networking including both WiFi and Bluetooth? If support ends for these devices and there are no longer security updates I don't want this device to be an attack vector on whatever network I bring this into. I see from screenshots that WiFi can be in a "Not connected" status but this doesn't indicate that the networking stack is completely shut off.

lockbox · June 5, 2023, 11:26am

github.com

jaames/playdate-reverse-engineering/blob/main/usb/usb.md

When connected to USB and unlocked, the Playdate provides a serial interface over USB. Commands are sent as ascii and must end in a newline character (`\n`). If the currently running game logs something to the console (e.g. via `print()` in Lua, or `playdate->system->logToConsole` in C) this will also be sent via serial output. Some commands (such as `button` or `stream enable`) will cause the Playdate to continually send data until another command is sent to cancel it, other commands (for example, `bitmap`) may require extra binary data to be sent after the newline character.

Some of these commands are used by Playdate Simulator for features like "preview bitmap" or "run pdx", or to enable streaming in Playdate mirror. If you want to play around with these, and you use a browser that supports WebSerial, you should check out my [pd-usb](https://github.com/jaames/pd-usb) library.

## USB details


|||
|:----------------|:------|
| *USB Vendor ID* | `0x1331` |
| *USB Product ID* | `0x5740` |
| *Baud rate* | `115200` |

## Connecting to the USB

You can use any terminal emulator to connect to the virtual serial port. For example, on macOS, you can connect using picocom by running:

`picocom -b 115200 -p n -d 8 --omap crcrlf /dev/cu.usbmodemPD<serial number>`

When you're done, disconnect and quit picocom with `CTRL-a` `CTRL-x`

This file has been truncated. show original

espoff sounds like what you want.

Though unless you do shenanigans the only network out ever done is tls to play.date or memfault via baked in certs for updates, scoreboards, etc. if their sites ever go down - aka if panic stops hosting the sites, the playdate consoles do check that their cert matches the baked in ones for their domain so you’re also good on that end.

lockbox · June 5, 2023, 11:32am

Also re: “attack vector”….I’m not sure your concerns are entirely on target. There’s no web browser or anything. And if someone does hit you with a esp32 radio driveby-> fw pivot to arm master you have other problems

82u · June 6, 2023, 2:01am

I just don't want another device that can be exploited by radio driveby because networking can't be turned off completely and exploit network hardware firmware vulnerabilities via its own radio while near the rest of my network.

It looks like there is no setting in settings then. Is there somewhere where I can send feature requests for the device/interface, not necessarily the sdk?