More meshtastik-like behavior

Can decode default channel (primary channel) with default password.

Revamped serial output.

src/platform/cubecell/cubecellCryptoEngine.cpp

@@ -0,0 +1,38 @@
+// This is the CryptoEngine for STM32WL, it works also for CubeCell
+
+#include "CryptoEngine.h"
+#include "aes.hpp"
+#include "configuration.h"
+
+class STM32WLCryptoEngine : public CryptoEngine
+{
+  public:
+    STM32WLCryptoEngine() {}
+
+    ~STM32WLCryptoEngine() {}
+
+    /**
+     * Encrypt a packet
+     *
+     * @param bytes is updated in place
+     */
+    virtual void encrypt(uint32_t fromNode, uint64_t packetNum, size_t numBytes, uint8_t *bytes) override
+    {
+        if (key.length > 0) {
+            AES_ctx ctx;
+            initNonce(fromNode, packetNum);
+            AES_init_ctx_iv(&ctx, key.bytes, nonce);
+            AES_CTR_xcrypt_buffer(&ctx, bytes, numBytes);
+        }
+    }
+
+    virtual void decrypt(uint32_t fromNode, uint64_t packetNum, size_t numBytes, uint8_t *bytes) override
+    {
+        // For CTR, the implementation is the same
+        encrypt(fromNode, packetNum, numBytes, bytes);
+    }
+
+  private:
+};
+
+CryptoEngine *crypto = new STM32WLCryptoEngine();