I'm trying to send image(3MB) captured by one pi to another pi, external WIFI or setting up one pi as AP is not possible due to strict regulations, all I can use are the two wires.
Currently I'm doing this by connecting RX and TX, forming a ppp connection, and transferring the file via python sockets, however, this is really slow, even at the maximum stable baud rate it still takes more than 30 seconds.
Is there an alternative way for me to achieve the same goal? Would bluetooth work?
Thank you in advance!!