esp-prog
	https://docs.espressif.com/projects/esp-iot-solution/en/latest/hw-reference/ESP-Prog_guide.html#communication-interface
port n+1 (~ttyUSB2)
esp-prog - devkit
VDD - VDD
GND - GND
ESP_IO0 - BOOT
ESP_EN - EN
ESP_TXD - TXD
ESP_RXD - RXD

1. power up devkit
2. hold boot on esp-prog
3. hit reset on esp-prog
4. release boot on esp-prog

ESP-Hosted
    slave is the device used for its wireless (esp)
    host is the master device (linux or esp)
ESP-Hosted-MCU
    esp to esp
    uses esp-wifi-remote under the hood
ESP-Hosted-NG
    esp to linux as native device
ESP-Hosted-FG
    esp to linux with some shit
ESP-Wifi-Remote (old? different)
    host p4/h2 to slave esp (goes on p4/h2/master/host)
    https://github.com/espressif/esp-hosted-mcu/tree/main/host

ESP-Hosted-MCU
    host esp (p4/h2) using slave esp (c6/c61/c5) for wireless
    https://github.com/espressif/esp-hosted-mcu/
    ESP-Hosted-MCU/host
        goes on host p4/h2
        https://github.com/espressif/esp-hosted-mcu/tree/main/host
    ESP-Hosted-MCU/slave
        goes on slave esp
        https://github.com/espressif/esp-hosted-mcu/tree/main/slave
    ESP-Hosted-MCU/examples
        test code
        https://github.com/espressif/esp-hosted-mcu/tree/main/examples

    When flashing slave device, esp-prog is preferred
        note io0 on devkit is boot on esp-prog

devkis
    c5 over sdio