lora.nvram_restore() OSError: [Errno 122] EMSGSIZE

[Etienne DAL PRA]

@jcaron I've found ! This problem comes from the fact that I flashed the card in "development" mode instead of "pybytes" and I put the version 1.20.2 r0 and it works well.

[John Baxter]

@Etienne-DAL-PRA Please can you advise the steps you have taken? I am having a very similar problem and I'm really stuck. Thank you :)

[Etienne DAL PRA]

@John-Baxter hi ! Yes of course. I'm sorry for the delay.
I used the Pycom Firmware Updater (you can download it there https://docs.pycom.io/updatefirmware/device/).
You need to close Atom or VS Code (the Pymakr console) before doing the upgrade. After you can do the upgrade with the Pycom Firmware Updater, you just need to select the Port and the type of your board.
Then, I chose as type : Pybytes and as version the lastest : 1.20.2.r4. And selected the options :

• Erase during update
• CONFIG partition
• NVS partition

And clicked on Continue.

I hope this helps you if you are still stuck :)

[John Baxter]

@Etienne-DAL-PRA Thank you very much. This fixed it :)

[Jaco Pretorius]

Good day

I have a similar problem. If try to send the string I get the following error. Any help would be appreciated.

Traceback (most recent call last):
File "<stdin>", line 1, in <module>
OSError: [Errno 122] EMSGSIZE

My code:

import socket
import pycom
import time
from network import Sigfox
from machine import Timer
time.sleep(1)

sigfox = Sigfox(mode=Sigfox.SIGFOX, rcz=Sigfox.RCZ1)
time.sleep(1)
s = socket.socket(socket.AF_SIGFOX, socket.SOCK_RAW)
time.sleep(1)
s.setblocking(True)
time.sleep(1)
s.setsockopt(socket.SOL_SIGFOX, socket.SO_RX, True)
time.sleep(1)

sSend = ""
aSigFox_Bits = [0,0,0,0, 0,0,0,1, 0,0,0,0, 0,0,1,0, 0,0,0,0, 0,0,1,1, 0,0,0,0, 0,1,0,0, 0,0,0,0, 0,1,0,1, 0,0,0,0, 0,1,1,0, 0,0,0,0, 0,1,1,1, 0,0,0,0, 1,0,0,0, 0,0,0,0, 1,0,0,1, 0,0,0,0, 1,0,1,0, 0,0,0,0, 1,0,1,1, 0,0,0,0, 1,1,0,0]
for i in range(0, 24):
  iHexChar = 8 * aSigFox_Bits[i*4] + 4 * aSigFox_Bits[i*4+1] + 2 * aSigFox_Bits[i*4+2] + aSigFox_Bits[i*4+3]
  sSend = sSend + str(hex(iHexChar)[2:])
print(sSend)

s.send(sSend.encode())

[jcaron]

@Jaco-Pretorius I believe this is completely unrelated to the original issue in this thread and is just because your encoding loop is incorrect and results in in a frame which is too long. Print the string and it’s length before sending it, it should be quite obvious.

[robert-hh]

@jcaron The sample string has a length of 24 bytes. Besides that, the loop looks overly complicated. If the input has to be a list of 0/1 values, it could be simplified a little bit to

sSend = bytearray(24)
aSigFox_Bits = [0,0,0,0, 0,0,0,1, 0,0,0,0, 0,0,1,0, 0,0,0,0, 0,0,1,1, 0,0,0,0, 0,1,0,0, 0,0,0,0, 0,1,0,1, 0,0,0,0, 0,1,1,0, 0,0,0,0, 0,1,1,1, 0,0,0,0, 1,0,0,0, 0,0,0,0, 1,0,0,1, 0,0,0,0, 1,0,1,0, 0,0,0,0, 1,0,1,1, 0,0,0,0, 1,1,0,0]
for i in range(0, 24):
  sSend[i] = 8 * aSigFox_Bits[i*4] + 4 * aSigFox_Bits[i*4+1] + 2 * aSigFox_Bits[i*4+2] + aSigFox_Bits[i*4+3]
print(len(sSend), sSend)

If is is a constant string, it can be written as:

sSend = bytes([0b0000, 0b0001, 0b0000, 0b0010, 0b0000, 0b0011, 0b0000, 0b0100, 0b0000, 0b0101, 0b0000, 0b0110, 0b0000, 0b0111, 0b0000, 0b1000, 0b0000, 0b1001, 0b0000, 0b1010, 0b0000, 0b1011, 0b0000, 0b1100])
print(len(sSend), sSend)

[jcaron]

@robert-hh I think the goal is to form a 12-byte message (max length of a Sigfox message). Each group of four bits is a nibble, but the conversion from bits to hex to bytes is incorrect.

Pretty sure there’s a much much simpler way of doing it but I’m not in a mood for Python today…

[robert-hh]

@jcaron OK. Then two nibbles must go into one byte. Like;

sSend = bytearray(12)
aSigFox_Bits = [0,0,0,0, 0,0,0,1, 0,0,0,0, 0,0,1,0, 0,0,0,0, 0,0,1,1, 0,0,0,0, 0,1,0,0, 0,0,0,0, 0,1,0,1, 0,0,0,0, 0,1,1,0, 0,0,0,0, 0,1,1,1, 0,0,0,0, 1,0,0,0, 0,0,0,0, 1,0,0,1, 0,0,0,0, 1,0,1,0, 0,0,0,0, 1,0,1,1, 0,0,0,0, 1,1,0,0]
for i in range(0, 12):
  i8 = i * 8
  byte = 0
  for j in range(8):
        byte = (byte << 1) | aSigFox_Bits[i8 + j] 
  sSend[i] = byte
print(len(sSend), sSend)

sSend = bytes([0b00000001, 0b00000010, 0b00000011, 0b00000100, 0b00000101, 0b00000110, 0b00000111, 0b00001000, 0b00001001, 0b00001010, 0b00001011, 0b00001100])
print(len(sSend), sSend)

[Jaco Pretorius]

@robert-hh Thank you