Added new examples and tests

examples/LoRaDuplexCallback/LoRaDuplexCallback.ino

@@ -0,0 +1,100 @@
+/*
+  LoRa Duplex communication wth callback
+
+  Sends a message every half second, and uses callback
+  for new incoming messages. Implements a one-byte addressing scheme,
+  with 0xFF as the broadcast address.
+
+  Note: while sending, LoRa radio is not listening for incoming messages.
+  Note2: when using the callback method, you can't use any of the Stream
+  functions that rely on the timeout, such as readString, parseInt(), etc.
+
+  created 28 April 2017
+  by Tom Igoe
+*/
+#include <SPI.h>              // include libraries
+#include <LoRa.h>
+const int csPin = 7;          // LoRa radio chip select
+const int resetPin = 6;       // LoRa radio reset
+const int irqPin = 1;         // change for your board; must be a hardware interrupt pin
+
+String outgoing;              // outgoing message
+byte msgCount = 0;            // count of outgoing messages
+byte localAddress = 0xBB;     // address of this device
+byte destination = 0xFF;      // destination to send to
+long lastSendTime = 0;        // last send time
+int interval = 2000;          // interval between sends
+
+void setup() {
+  while (!Serial);
+  Serial.begin(9600);                   // initialize serial
+  Serial.println("LoRa Duplex with callback");
+  LoRa.setPins(csPin, resetPin, irqPin);// set CS, reset, IRQ pin
+
+  if (!LoRa.begin(915E6)) {             // initialize ratio at 915Mhz
+    Serial.println("LoRa init failed. Check your connections.");
+    while (true);                       // if failed, do nothing
+  }
+
+  LoRa.onReceive(onReceive);
+  LoRa.receive();
+  Serial.println("LoRa init succeeded.");
+}
+
+void loop() {
+    if (millis() - lastSendTime > interval) {
+      String message = "HeLoRa World!";   // send a message
+      sendMessage(message);
+      Serial.println("Sending " + message);
+      lastSendTime = millis();            // timestamp the message
+      interval = random(2000) + 1000;     // 2-3 seconds
+      LoRa.receive();                     // go back into receive mode
+    }
+}
+
+void sendMessage(String outgoing) {
+  LoRa.beginPacket();                   // start packet
+  LoRa.write(destination);              // add destination address
+  LoRa.write(localAddress);             // add sender address
+  LoRa.write(msgCount);                 // add message ID
+  LoRa.write(outgoing.length());        // add payload length
+  LoRa.print(outgoing);                 // add payload
+  LoRa.endPacket();                     // finish packet and send it
+  msgCount++;                           // increment message ID
+}
+
+
+void onReceive(int packetSize) {
+  if (packetSize == 0) return;          // if there's no packet, return
+
+  // read packet header bytes:
+  int recipient = LoRa.read();          // recipient address
+  byte sender = LoRa.read();            // sender address
+  byte incomingMsgId = LoRa.read();     // incoming msg ID
+  byte incomingLength = LoRa.read();    // incoming msg length
+  String incoming = "";                 // payload of packet
+  while (LoRa.available()) {            // can't use readString() in callback, so
+    incoming += (char)LoRa.read();      // add bytes one by one
+  }
+  if (incomingLength != incoming.length()) {   // check length for error
+    Serial.println("error: message length does not match length");
+    return;                             // skip rest of function
+  }
+
+  // if the recipient isn't this device or broadcast,
+  if (recipient != localAddress && recipient != 0xFF) {
+    Serial.println("This message is not for me.");
+    return;                             // skip rest of function
+  }
+
+  // if message is for this device, or broadcast, print details:
+  Serial.println("Received from:" + String(sender, HEX));
+  Serial.println("Sent to:" + String(recipient, HEX));
+  Serial.println("Message ID:" + String(incomingMsgId));
+  Serial.println("Message length:" + String(incomingLength));
+  Serial.println("Message:" + incoming);
+  Serial.println("RSSI:" + String(LoRa.packetRssi()));
+  Serial.println("Snr:" + String(LoRa.packetSnr()));
+  Serial.println();
+}
+