external_access: Add PWM warnings to the server

Also fixed a bug that only counted the first digit

Signed-off-by: Alistair Francis <alistair23@gmail.com>
stm324f05_timer: Update how PWM is displaed and sent

PWM is now only displayed when debug printing is enabled
Also only sends the information to the server upon a change

Signed-off-by: Alistair Francis <alistair23@gmail.com>