MicroPython EByte E220: Data size not match!

[xwingmll]

Hello,
Something similar happens to me:

>>> %Run -c $EDITOR_CONTENT
Initialization: {} Success
Retrieve configuration: {} Data size not match!
—————————————-
Traceback (most recent call last):
File “<stdin>”, line 17, in <module>
File “/lib/lora_e220.py”, line 245, in print_configuration
AttributeError: ‘NoneType’ object has no attribute ‘_COMMAND’

I wire everithing as you say and import the modules and use the get configuration program

How can i fix this?

[Renzo Mischianti]

Hi xwingmll,
when the device return data size does not match It’s a high probability that you wrong set M0 and M1 pins, or power supply issues.
Bye Renzo

[xwingmll]

Hi Renzo,

I have an E220-900T220 with ESP32-WROOM-32.

I had to modify line 330 module lora_E220 because I was getting an error from Invalid model

class LoRaE220:
# now the constructor that receive directly the UART object
def __init__(self, model, uart, aux_pin=None, m0_pin=None, m1_pin=None,
uart_baudrate=SerialUARTBaudRate.BPS_RATE_9600):
self.uart = uart
self.model = model

pattern = ‘^(400|433|868|900|915|170)(T|R|S|M)(22|27|30)(S|D|C)?..?(\\d)?$’

Now I get the data size error, see image

[Renzo Mischianti]

Sorry,
I fixed the regular expression, and I re-tested the library with an esp32 devkit v1 and It’s works correctly, I can reproduce your error by putting an AUX pin or M0 M1 pin wrong
Check the wiring or power supply.
Bye Renzo

[xwingmll]

In the end, keeping the same wiring, I formatted the ESP32 and reinstalled the firmware and it worked fine.

Thank you for responding so quickly and for your work. It’s a very good job, congratulations

[Renzo Mischianti]

Hi xwingmll,
hehehehe.. sometimes the solution is to power off and power on.
Thanks, sorry for the issue I insert, but It’s a work in progress.
Please keep in touch if you find some other problem.
Bye Renzo

[Author]

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