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examples/rf95/rf95_encrypted_server/rf95_encrypted_server.ino

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+//  LoRa simple server with encrypted communications 
+// In order for this to compile you MUST uncomment the #define RH_ENABLE_ENCRYPTION_MODULE line
+// at the bottom of RadioHead.h, AND you MUST have installed the Crypto directory from arduinolibs:
+// http://rweather.github.io/arduinolibs/index.html
+//  Philippe.Rochat'at'gmail.com
+//  06.07.2017
+
+#include <RH_RF95.h>
+#include <RHEncryptedDriver.h>
+#include <Speck.h>
+
+RH_RF95 rf95;     // Instanciate a LoRa driver
+Speck myCipher;   // Instanciate a Speck block ciphering
+RHEncryptedDriver myDriver(rf95, myCipher); // Instantiate the driver with those two
+
+float frequency = 868.0; // Change the frequency here. 
+unsigned char encryptkey[16]={1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16}; // The very secret key 
+
+void setup() {
+  Serial.begin(9600);
+  while (!Serial) ; // Wait for serial port to be available
+  Serial.println("LoRa Simple_Encrypted Server");
+  if (!rf95.init())
+    Serial.println("LoRa init failed");
+  // Setup ISM frequency
+  rf95.setFrequency(frequency);
+  // Setup Power,dBm
+  rf95.setTxPower(13);
+  myCipher.setKey(encryptkey, 16);
+  delay(4000);
+  Serial.println("Setup completed");
+}
+
+void loop() {
+  if (myDriver.available()) {
+    // Should be a message for us now   
+    uint8_t buf[myDriver.maxMessageLength()];
+    uint8_t len = sizeof(buf);
+    if (myDriver.recv(buf, &len)) {
+      Serial.print("Received: ");
+      Serial.println((char *)&buf);
+    }
+    else
+    {
+        Serial.println("recv failed");
+    }
+  }
+}