Serial port data transmission and reception
set tx rx baud use uart
Set serial port pins and baud rate
read all
Read all data from the serial port at once
read characters
Read a specified number of characters
read line
Read data up to a newline character
remain cache
Read remaining data in the buffer
write number in
Write a number to the serial port
write a line in
Write a line of text to the serial port
write in
Write a string to the serial port
write raw date in
Write raw data to the serial port (e.g., b"/xff/xab")
Read data from the serial port and send data to the serial port