E220 LoRa Receive-Intervall and MycroPython and Arduino Env communication (UnicodeError:)

Hello, I use the following to receive data:

while True:
    if lora.available() > 0:
       code, value = lora.receive_message()
       print(ResponseStatusCode.get_description(code))

       print(value)
       time.sleep(2)

My question is, what is the time.sleep(2) for? I have noticed that if I send data within 2sec, then I get an error message in the Thonny IDE or the data is lost. And what happens if several transmitters send data at the same time? Kind regards, woto