inital commit

include/WMbusFrame.h

@@ -0,0 +1,41 @@
+#ifndef __WMBUS_FRAME__
+#define __WMBUS_FRAME__
+
+#include <Arduino.h>
+#include <Crypto.h>
+#include <AES.h>
+#include <CTR.h>
+#include "credentials.h"
+
+class WMBusFrame
+{
+  public:
+    static const uint8_t MAX_LENGTH = 64;
+  private:
+    CTR<AESSmall128> aes128;
+    const uint8_t meterId[4] = { W_SERIAL_NUMBER }; // Multical21 serial number
+    const uint8_t key[16] = { W_ENCRYPTION_KEY }; // AES-128 key
+    uint8_t cipher[MAX_LENGTH];
+    uint8_t plaintext[MAX_LENGTH];
+    uint8_t iv[16];
+    void check(void);
+    void printMeterInfo(uint8_t *data, size_t len);
+
+  public:
+    // check frame and decrypt it
+    void decode(void);
+
+    // true, if meter information is valid for the last received frame
+    bool isValid = false;
+
+    // payload length
+    uint8_t length = 0;
+
+    // payload data
+    uint8_t payload[MAX_LENGTH];
+
+    // constructor
+    WMBusFrame();
+};
+
+#endif // __WMBUS_FRAME__