LoRa on 2 LOPYs plus serial

[monersss]

Dear All,

I need your help. I am working on connection serial -lopy-lopy-serial.
I need to send an alert to 1 lopy via serial and than forward it to a second lopy via LoRa.
Since I want to be sure that the whole alert has been sent it has to finish with special character \n. It works well till i am using LoRa, where what I am getting on second lopy is my alert but without \n. Could you help me to understand what i am doing wrong?
Computer code is this one:

import os
import serial
import time


ser = serial.Serial("/COM6", 115200, timeout = 10)
alert0 = 'message' + '\n'
alert = alert0.encode('utf-8')
ser.write(bytearray(alert))
        
ser.close()
        
time.sleep(3)

First lopy:

from machine import UART
from network import LoRa
import socket
import pycom
import time

uart = UART(1, baudrate=115200, pins = ('P20', 'P21'), timeout_chars=2000)
lora = LoRa(mode=LoRa.LORA, frequency=863000000)
s = socket.socket(socket.AF_LORA, socket.SOCK_RAW)
s.setblocking(False)

while True:
    data = uart.read(1000)
    print ('.')
    if (data is not None) and ('\n' in (data.decode('utf-8'))):
        print(data)
        s.send(data)
    final = s.recv(64)
    print(final)
    time.sleep_ms(1000)

and second lopy, where I receive the alert via LoRa and save it on SD is here:

from network import LoRa
import socket
import pycom
import time

lora = LoRa(mode=LoRa.LORA, frequency=863000000)
s = socket.socket(socket.AF_LORA, socket.SOCK_RAW)
s.setblocking(False)

while True:
    data1 = s.recv(64)
    if len(data1) > 0:
        s.send('data here')
        with open('/sd/lora_alert.txt','ab') as f:
            f.write(data1)
    else:
        s.send('no alerts')
    time.sleep(2)

and here i got stuck as what i get on SD is not what I have sent...

[seb]

@monersss
Can you post a sample of the file stored on the SD card? I programmed the first lopy to constantly send hello, and this was my result:

Hello
Hello
Hello
Hello
Hello
Hello
Hello
Hello
Hello
Hello
Hello
Hello
Hello
Hello
Hello
Hello
Hello
Hello
Hello
...

[monersss]

@seb Sorry, I have missed this part of the code. Second lopy has this code in main, together with importing .py file torub LoRa , so here everythins works well, The message is stored on SD but without \n at the end....

[seb]

Hi,

Looking over your code I noticed you do not mount the SD card, please add this code:

from machine import SD

sd = SD()
os.mount(sd, '/sd')

I just tried this code running on two lopys with the latest firmware and everything seems to work as expected.

[monersss]

@livius maybe You could help me. .please... :)