Introduction - If you have any usage issues, please Google them yourself
CPU is STM32F103RBT6, external 8M crystal. The program implements the Serial Port 1 interrupt reception string (line breaks must end, that check on the serial debug " line breaks" on the retransmission assistant). After the completion of the way, the string through the button (GPIO) and then receives a way to send out. Will each receive updates sent. String buffer is set to 20 (can adjust their own)