I want to be able to use my HC-05, currently on Serial3 to download code to on my 2560 from a connected android tablet. I'm currently running MegaCore, which has optiboot on it.
I've looked for examples of this and can't find one. Surely someone is doing this and the optiboot documentation says you can do it.
I am currently planning on downloading the hex file, but let me know if there's a better approach.