Note that esp32 (and esp8266) use proprietary, closed-source network stacks[0] It's not a important in this project as there is a separate "main" MCU, but havi

Note that esp32 (and esp8266) use proprietary, closed-source network stacks[0] It's not a important in this project as there is a separate "main" MCU, but having radio module with closed-source software, active radios, and which you pass unencrypted data through (like bluetooth audio) might concern some people. (The SIM module is likely closed-source too, but hopefully it's impact is much more limited - if you care about privacy, you would not send any data over cell phone networks unencrypted) [0] https://github.com/espressif/esp32-wifi-lib/issues/1 https://github.com/espressif/esp32-wifi-lib/issues/1