TypeError: object with buffer protocol required Lora and I2C

[Asim Khan]

I am receiving some data via from STM32 on my poly4 and its fine. But when i send that data via lora a get folloeng error "TypeError: object with buffer protocol required" for the line s.send(data)

Below is my code

data = ''
data =   uartpic.uart.read()

while True:

    s.setblocking(True)
    s.send(data)
    utime.sleep_ms(500)

For lora (https://docs.pycom.io/tutorials/networks/lora/lorawan-otaa). if i send some other data via lora(e.g. data = "Hello" s.send(data) ), it is working for me but not for data = uartpic.uart.read()

[robert-hh]

@Asim-Khan uart.read() is non-blocking. If there is no data available, it returns None. And None ist not an object with a buffer protocol. Thus the error message. You have to test before sending, if you have read something from the UART.

[Gijs]

You might have to use struct.pack() (for multiple data pieces) or bytes(data) to transform the data object to the correct type.