if the transmitter sends within 2sec, then the Micropython programme as receiver is terminated with the error unicode-error at line 636 in lora_e220.py.
What could be the reason for this? The message is only a few bytes long:
“Hello World! 1”. The next message is then “Hello World! 2” and so on.
Hi Renzo,
I have now found a little time to reproduce the error.
When I send a message every second I get the following message in the Thonny editor:
Traceback (most recent call last):
File "<stdin>", line 127, in <module>
File "/lib/LoraWanE220/lora_e220.py", line 636, in receive_message
UnicodeError:
I’ve been experimenting some with data corruption on my setup sending between arduino and pi pico(micropython).
Factors to consider:
1. Timing
2. Forward Error Correction
3. “ReceiveMessageUntil()”, i have experimented with this setting as i was receiving two messages packed into one… eg. “Msg0Msg1”, using this setting seems to help??
If both devices are powered up at same time, and one LoRa begins receiving half way through the senders transmission, it will only receive half the message, hence corrupted data. I have only noticed this happening with FEC off, but more testing needed.
Once I’m able to log into forum here on my computer I will post my code for the working setup I’m putting together.
I am using bare ATMEGA328P chip on arduino side, and pi pico on the other side.
When I enter the following in the Thonny IDE, I get an error message:
>>> b'\xf0'.decode()
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
UnicodeError:
>>>
I think the problem is the character \xf0.
This does not seem to be a Unicode character. Unfortunately, µPython does not allow you to specify a second parameter in the decode() function, e.g. data.decode('UTF-8','ignore').
This does not work.
But how can this be solved?
This reply was modified 8 months, 1 week ago by woto.
Hi renzo,
I think I have a solution for myself, maybe for others too.
I have created a new static method in the class LoraE220:
@staticmethod
def _cleanData(_data):
data = bytes(_data)
ret_values = []
ret_arr = bytearray(ret_values)
for i in range(len(_data)):
if _data[i] <= 127 :
ret_arr.append(_data[i])
return ret_arr
This methode is called before the decode function:
str_ret = LoRaE220._cleanData(data)
data = str_ret.decode('utf-8')
msg = data
Now the decoding function works and if I define a separator for the sender, I can separate the messages from each other.
This reply was modified 8 months, 1 week ago by woto.
Hi Woto,
thanks. It’s very interesting and helpful.
I’m going to examine the situation, but with your help, I think It will become simpler.
Thanks again, Renzo.
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