Hi there,
I bought several lora modules with raspberry pi shields, and I want to know about the data rate of LoRa .

In your own implemented code, ardupiLoRa, there is several tx code like this.



/*
* LoRa 868 / 915MHz SX1272 LoRa module
*
* Copyright (C) Libelium Comunicaciones Distribuidas S.L.
* http://www.libelium.com
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see http://www.gnu.org/licenses/.
*
* Version: 1.2
* Design: David Gasc처n
* Implementation: Covadonga Albi챰ana, Victor Boria, Ruben Martin
*/

// Include the SX1272 and SPI library:
#include "arduPiLoRa.h"

int e;

char message1 [] = "Packet 1, wanting to see if received packet is the same as sent packet";
char message2 [] = "Packet 2, broadcast test";

void setup()
{
// Print a start message
printf("SX1272 module and Raspberry Pi: send packets with ACK\n");

// Power ON the module
e = sx1272.ON();
printf("Setting power ON: state %d\n", e);

// Set transmission mode
e |= sx1272.setMode(4);
printf("Setting Mode: state %d\n", e);

// Set header
e |= sx1272.setHeaderON();
printf("Setting Header ON: state %d\n", e);

// Select frequency channel
e |= sx1272.setChannel(CH_10_868);
printf("Setting Channel: state %d\n", e);

// Set CRC
e |= sx1272.setCRC_ON();
printf("Setting CRC ON: state %d\n", e);

// Select output power (Max, High or Low)
e |= sx1272.setPower('H');
printf("Setting Power: state %d\n", e);

// Set the node address
e |= sx1272.setNodeAddress(3);
printf("Setting Node address: state %d\n", e);

// Print a success message
if (e == 0)
printf("SX1272 successfully configured\n");
else
printf("SX1272 initialization failed\n");

delay(1000);
}

void loop(void)
{
// Send message1 and print the result
e = sx1272.sendPacketTimeoutACK(8, message1);
printf("Packet sent, state %d\n",e);

delay(4000);

// Send message2 broadcast and print the result
e = sx1272.sendPacketTimeoutACK(0, message2);
printf("Packet sent, state %d\n",e);

delay(4000);
}

int main (){
setup();
while(1){
loop();
}
return (0);
}





in loop() code, there is delay(4000); line.

it means device will transmit LoRa packet with 4sec interval right?

what i want to know is that this delay is really necessary or not.

if delay is necessary, how much we can decrease that delay?

Hi oyj0594,

This delay was configured by our developers to ensure the communication. You can remove it but maybe the module fail some times.

Regards