How to prepare for using this software and how to interface with the abstraction provided by this driver

• Create tmpfs filesystem in RAM and mount it under path /custom : $ mount -t tmpfs -o size=16m tmpfs /custom

• Set appropriate permissions for /custom

• The driver control files will be present inside the /custom/ucdX driver provided device directory which is created upon running the driver executable for a given serial port and device index (see below)

• A serial port file has to be provided as an argument to the driver executable, together with a device index, for example $ ucd /dev/ttyUSB0 0 will attach the driver to the serial port /dev/ttyUSB0 and create a driver-provided device directory /custom/ucd0.

• Writing f to /custom/ucdX/request will request a frame from an ESP32-CAM running the uart-cam firmware. To check if the frame is ready, you can read from /custom/ucdX/state. 1 means ready and 0 means not ready.

• To perform an OTA update over UART, the driver user writes the new firmware to /custom/ucdX/firmware (for example $ cat /path/to/firmware | tee /custom/ucdX/firmware), then triggers the update by writing u to /custom/ucdX/request.

UPDATE

In the newest version of the program there is an additional paramter - 0 or 1 indicating whether to drain the serial input before handling communications