'''
https://circuitpython.readthedocs.io/en/2.x/shared-bindings/busio/UART.html
connect D3 and D4 to test
'''
import board
from busio import UART
uart = UART(board.D4, board.D3)
uart.write('test')
uart.read(4)
uart.write('test2\n')
uart.readline() # reads until a \n character
import board
from busio import UART
import utime
FONA_BAUD = 4800
uart = UART(board.D0, board.D2,
baudrate=FONA_BAUD) # for UART2 on esp32 dev board, RX:16, TX:17
uart.init(FONA_BAUD)
# clear the buffer
for i in range(3):
uart.readline()
# check replies
for i in range(10):
message = "AT"
uart.write(message + '\r\n') # \r and \n seem necessary
print(">>\n" + message)
utime.sleep(.1)
response = uart.read().decode('ascii')
print("<<")
print(response.split())
utime.sleep(.1)