LoRa Star Network

[Anonymouse-X]

I am using Ra-02 Ai-Thinker with Arduino Uno and Arduino Mega. Can someone help me with this? Why I am not receiving the sent byte from Sensor_Data_Receiver to Sensor_Data_Sender? And also can you verify wheter what I did in coding is correct and what are the improvements I can make here.

What I am trying to do here is to send request first from Sensor_Data_Receiver to Sensor_Data_Sender before sending the sensor data.

I will connect 2 other nodes later. It will be like 1 receiver with 3 sensor data transmitters.

Here are the codes

`//Sensor Data Receiver

#include <SPI.h> // include libraries
#include <LoRa.h>

struct Data {
byte a;
float b;
float c;
float d;
float e;
float f;
float g;
float h;
float i;
} data;

unsigned long previousMillis=0;
unsigned long int previoussecs = 0;
unsigned long int currentsecs = 0;
unsigned long currentMillis = 0;
int interval= 1 ; // updated every 1 second
int Secs = 0;

void setup() {
// put your setup code here, to run once:
Serial.begin(115200);
while (!Serial);
Serial.println("LoRa Receiver");
LoRa.setPins(10, 9, 2); // 10 for UNO, 53 for Mega
if (!LoRa.begin(433E6)) {
Serial.println("Starting LoRa failed!");
while (1);
}

LoRa.setGain(6);
LoRa.setSyncWord(0x22);

LoRa.onReceive(onReceive);
LoRa.onTxDone(onTxDone);
LoRa_rxMode();

}

void loop() {
// put your main code here, to run repeatedly:
currentMillis = millis();
currentsecs = currentMillis / 1000;
if ((unsigned long)(currentsecs - previoussecs) >= interval) {
Secs = Secs + 1;
if ( Secs >= 7){
Secs = 1;
}

if (Secs == 1) {
  LoRa_txMode();
  sendMessage(0xBB);
}

// if (Secs == 2){ 
//   onReceive(LoRa.parsePacket());
// }

if (Secs == 3) {
  LoRa_txMode();
  sendMessage(0xCC);
}

// if (Secs == 4) {
//   onReceive(LoRa.parsePacket());
// }

if (Secs == 5) {
  LoRa_txMode();
  sendMessage(0xDD);
}

// if (Secs == 6) {
//   onReceive(LoRa.parsePacket());
// }
previoussecs = currentsecs;

}

onReceive(LoRa.parsePacket());

}

void LoRa_rxMode(){
LoRa.disableInvertIQ(); // normal mode
LoRa.receive(); // set receive mode
Serial.println("Rx Mode!");
}

void LoRa_txMode(){
LoRa.idle(); // set standby mode
LoRa.enableInvertIQ(); // active invert I and Q signals
Serial.println("Tx Mode!");
}

void sendMessage(byte otherNode){

LoRa.beginPacket(); // start packet
LoRa.write(otherNode); // add destination address
LoRa.endPacket(true); // finish packet and send it
Serial.println(otherNode);
}

void onReceive(int packetSize){

// try to parse packet
if (packetSize) {
// received a packet
// Serial.print("\nReceived packet size ");
// Serial.print(packetSize);
// read packet
while (LoRa.available())
for (int i = 0; i < packetSize; i++) {
((byte *) &data)[i] = LoRa.read();
// Serial.print(' ');
// Serial.print(((byte *) &data)[i]);
}
// print RSSI of packet
// Serial.print(" with RSSI ");
// Serial.println(LoRa.packetRssi());
Serial.print(data.a); Serial.print(" ");
Serial.print(data.b); Serial.print(" ");
Serial.print(data.c); Serial.print(" ");
Serial.print(data.d); Serial.print(" ");
Serial.print(data.e); Serial.print(" ");
Serial.print(data.f); Serial.print(" ");
Serial.print(data.g); Serial.print(" ");
Serial.print(data.h); Serial.print(" ");
Serial.print(data.i); Serial.print(" ");
Serial.println(" ");
}
}

void onTxDone() {
Serial.println("TxDone");
Serial.println(" ");
LoRa_rxMode();
}`

`//Sensor Data Sender Node 1

#include <SPI.h> // include libraries
#include <LoRa.h>

struct Data {
byte a;
float b;
float c;
float d;
float e;
float f;
float g;
float h;
float i;
};

Data data = {0xBB, 0, 0, 0, 0, 0, 0, 0, 0};

void setup() {
// put your setup code here, to run once:
Serial.begin(115200);
while (!Serial);
Serial.println("LoRa Sender");
LoRa.setPins(53, 9, 2); // 10 for UNO, 53 for Mega
if (!LoRa.begin(433E6)) {
Serial.println("Starting LoRa failed!");
while (1);
}

LoRa.setGain(6);
LoRa.setSyncWord(0x22);

LoRa.onReceive(onReceive);
LoRa.onTxDone(onTxDone);
LoRa_rxMode();

}

void loop() {
// put your main code here, to run repeatedly:
onReceive(LoRa.parsePacket());

}

void LoRa_rxMode(){
LoRa.disableInvertIQ(); // normal mode
LoRa.receive(); // set receive mode
Serial.println("Rx Mode!");
}

void LoRa_txMode(){
LoRa.idle(); // set standby mode
LoRa.enableInvertIQ(); // active invert I and Q signals
Serial.println("Tx Mode!");
}

void sendMessage(struct Data) {
LoRa_txMode(); // set tx mode
LoRa.beginPacket(); // start packet
for (unsigned int i = 0; i < sizeof(Data);i++) {
// Serial.print(' ');
LoRa.write(((byte *) &data)[i]);
}
LoRa.endPacket(true); // finish packet and send it
}

void onReceive(int packetSize) {

LoRa.receive();
if (packetSize == 0) return;
byte recipient = LoRa.read();
Serial.print(recipient);

while (recipient != 0xBB){
byte recipient = LoRa.read();
}

data.b += 1;
data.c += 1;
data.d += 1;
data.e += 1;
data.f += 1;
data.g += 1;
data.h += 1;
data.i += 1;
sendMessage(data);
}

void onTxDone() {
Serial.println("TxDone");
Serial.println(" ");
LoRa_rxMode();
}`

[Kongduino]

1. To make your code readable, surround it with THREE backticks each, not one.
2. You set up the onReceive callback, no need (and a bad idea) to call onReceive(LoRa.parsePacket()); in the loop() event...