Hello,
I have been having a problem with trying to send data to the LoRa network using the MKR WAN 1300. The code is:
#include <MKRWAN.h>
#include "arduino_secrets.h"
LoRaModem modem;
bool pump_running = false;
int water_level = 0;
const int empty_level = 0;
const int full_level = 5;
void setup() {
Serial.begin(115200);
while (!Serial);
if (!modem.begin(EU868)){
Serial.println("Failed to start module");
while (1){}
};
Serial.print("Your device EUI is: ");
Serial.println(modem.deviceEUI());
int connected = modem.joinOTAA(appEui, appKey);
if (!connected){
Serial.println("Something went wrong! Retry");
while (1){}
}
modem.minPollInterval(60);
Serial.println("Successfully joined the network!");
pinMode(13,OUTPUT); //Set pin 13 as OUTPUT pin, to send signal to relay
}
void loop() {
// put your main code here, to run repeatedly:
adjust_water_level();
send_level();
for (int i =0;i<10;i++){ /*10 * 1 second delay*/
check_downlink_messages();
delay(1000);
}
}
void adjust_water_level(){
if (pump_running){
if (water_level < full_level){ /*Can't be overfilled*/
water_level += 1; /*Water level rises*/
}
}
else {
if (water_level > empty_level){ /*Can't be less than empty*/
water_level -= 1; /*Water level drops*/
}
}
return;
}
void send_level(){
int err;
//modem.setPort(4);
Serial.print("Sending water level: ");
Serial.println(water_level);
modem.beginPacket();
modem.write(water_level);
err = modem.endPacket(true);
if (err > 0) {
Serial.println("Message sent correctly!");
}
else {
Serial.println("Error sending message :(");
}
return;
}
void check_downlink_messages(){
if (!modem.available()) { /*If there was no message, get out of function*/
Serial.println("No downlink message received at this time.");
return;
}
else { /*If there is a message*/
Serial.print("Message Received: ");
if (modem.read()!= 0){ /*The first byte is non-zero*/
Serial.println("Starting the pump");
pump_running = true;
digitalWrite(13,HIGH); //if pump is not running, send HIGH value to relay
}
else{
Serial.println("Stopping the pump");
pump_running = false;
digitalWrite(13,LOW); //if pump is not running, send LOW value to relay
}
}
return;
}
The message gets uploaded to the TTN, however I get Payload: {ledState: null} 02 00 00 00 when I send an integer with a value of 2 to the network using the modem.write() function. I did this just for testing purposes. Later I used a uplink simulation to see if perhaps I used the wrong payload formatting, however that is not the case. I should be getting a Payload similar to the simulation, that being Payload: {port: 4, water_level=2).
Note that I am completely new to both arduino and lora, and this is a simple school project with a deadline, so I would appreciate if someone could help me out ASAP. After TTN v3 came out I am not sure if any older online resources are helpful anymore and I desperately need help.
