111 lines
4.1 KiB
C++
111 lines
4.1 KiB
C++
/*
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LoRa Duplex communication wth callback
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Sends a message every half second, and uses callback
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for new incoming messages. Implements a one-byte addressing scheme,
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with 0xFF as the broadcast address.
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Note: while sending, LoRa radio is not listening for incoming messages.
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Note2: when using the callback method, you can't use any of the Stream
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functions that rely on the timeout, such as readString, parseInt(), etc.
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created 28 April 2017
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by Tom Igoe
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*/
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#include <SPI.h> // include libraries
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#include <LoRa.h>
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#ifdef ARDUINO_SAMD_MKRWAN1300
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#error "This example is not compatible with the Arduino MKR WAN 1300 board!"
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#endif
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const int csPin = 7; // LoRa radio chip select
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const int resetPin = 6; // LoRa radio reset
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const int irqPin = 1; // change for your board; must be a hardware interrupt pin
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String outgoing; // outgoing message
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byte msgCount = 0; // count of outgoing messages
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byte localAddress = 0xBB; // address of this device
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byte destination = 0xFF; // destination to send to
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long lastSendTime = 0; // last send time
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int interval = 2000; // interval between sends
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void setup() {
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Serial.begin(9600); // initialize serial
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while (!Serial);
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Serial.println("LoRa Duplex with callback");
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// override the default CS, reset, and IRQ pins (optional)
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LoRa.setPins(csPin, resetPin, irqPin);// set CS, reset, IRQ pin
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if (!LoRa.begin(915E6)) { // initialize ratio at 915 MHz
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Serial.println("LoRa init failed. Check your connections.");
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while (true); // if failed, do nothing
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}
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LoRa.onReceive(onReceive);
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LoRa.receive();
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Serial.println("LoRa init succeeded.");
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}
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void loop() {
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if (millis() - lastSendTime > interval) {
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String message = "HeLoRa World!"; // send a message
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sendMessage(message);
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Serial.println("Sending " + message);
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lastSendTime = millis(); // timestamp the message
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interval = random(2000) + 1000; // 2-3 seconds
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LoRa.receive(); // go back into receive mode
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}
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}
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void sendMessage(String outgoing) {
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LoRa.beginPacket(); // start packet
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LoRa.write(destination); // add destination address
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LoRa.write(localAddress); // add sender address
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LoRa.write(msgCount); // add message ID
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LoRa.write(outgoing.length()); // add payload length
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LoRa.print(outgoing); // add payload
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LoRa.endPacket(); // finish packet and send it
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msgCount++; // increment message ID
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}
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void onReceive(int packetSize) {
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if (packetSize == 0) return; // if there's no packet, return
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// read packet header bytes:
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int recipient = LoRa.read(); // recipient address
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byte sender = LoRa.read(); // sender address
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byte incomingMsgId = LoRa.read(); // incoming msg ID
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byte incomingLength = LoRa.read(); // incoming msg length
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String incoming = ""; // payload of packet
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while (LoRa.available()) { // can't use readString() in callback, so
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incoming += (char)LoRa.read(); // add bytes one by one
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}
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if (incomingLength != incoming.length()) { // check length for error
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Serial.println("error: message length does not match length");
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return; // skip rest of function
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}
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// if the recipient isn't this device or broadcast,
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if (recipient != localAddress && recipient != 0xFF) {
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Serial.println("This message is not for me.");
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return; // skip rest of function
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}
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// if message is for this device, or broadcast, print details:
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Serial.println("Received from: 0x" + String(sender, HEX));
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Serial.println("Sent to: 0x" + String(recipient, HEX));
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Serial.println("Message ID: " + String(incomingMsgId));
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Serial.println("Message length: " + String(incomingLength));
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Serial.println("Message: " + incoming);
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Serial.println("RSSI: " + String(LoRa.packetRssi()));
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Serial.println("Snr: " + String(LoRa.packetSnr()));
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Serial.println();
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}
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