THLL wrote:As for the bridge goes does the sent .hex file get stored on the esp then the arduino pulls it on reset?
No, the term "transparent bridge" simply means that once the ESP Rx/Tx are connected to Arduino Tx/Rx, the Telnet connection communicates directly with the serial lines of the Arduino.
To get the programming running, you start avrdude immediately after having reset the Arduino by invoking the +++AT GPIO command.