diff --git a/examples/MultiDevice/src/main.cpp b/examples/MultiDevice/src/main.cpp
index a102683..76b323a 100644
--- a/examples/MultiDevice/src/main.cpp
+++ b/examples/MultiDevice/src/main.cpp
@@ -165,6 +165,9 @@ void setup() {
     // Add your devices here
     // Replace with your actual MAC addresses and encryption keys
 
+    // CORRECT in Alternative
+    // Rainbow48V at MAC e4:05:42:34:14:f3
+
     // Temporary - Scott Example
     victron.addDevice(
         "Rainbow48V",                              // Device name
@@ -173,6 +176,7 @@ void setup() {
         DEVICE_TYPE_SOLAR_CHARGER                    // Device type
     );
 
+    // XXX These numbers make no sesne, one above is correct - wrong MAC?
     victron.addDevice(
         "Rainbow48Vb",                              // Device name
         "3ffd00b83ffd00be",
@@ -188,6 +192,23 @@ void setup() {
         DEVICE_TYPE_SOLAR_CHARGER                    // Device type
     );
 
+    // WHY this one work?
+    victron.addDevice(
+        "Rainbow48Vd",                              // Device name
+        "3fca91c83fca91ce",
+        "0ec3adf7433dd61793ff2f3b8ad32ed8",         // Encryption key (32 hex chars)
+        DEVICE_TYPE_SOLAR_CHARGER                    // Device type
+    );
+
+    // WHY this one work?
+    victron.addDevice(
+        "Rainbow48Vf",                              // Device name
+        "3fcf38283fcf382e",
+        "0ec3adf7433dd61793ff2f3b8ad32ed8",         // Encryption key (32 hex chars)
+        DEVICE_TYPE_SOLAR_CHARGER                    // Device type
+    );
+
+
     /*
      *
      [VictronBLE] Encrypted data: A0 01 83 2C 0E CF D6 04 89 72 6E 81 56 E4 2D F1 83
diff --git a/experiment/platformio.ini b/experiment/platformio.ini
new file mode 100644
index 0000000..8d30ca8
--- /dev/null
+++ b/experiment/platformio.ini
@@ -0,0 +1,35 @@
+[env]
+lib_extra_dirs = ..
+
+[env:esp32-s3]
+platform = espressif32
+board = esp32-s3-devkitc-1
+framework = arduino
+monitor_speed = 115200
+monitor_filters = esp32_exception_decoder
+build_flags =
+    -D ARDUINO_USB_MODE=1
+    -D ARDUINO_USB_CDC_ON_BOOT=1
+#    -DCORE_DEBUG_LEVEL=3
+
+[env:esp32-c3]
+platform = espressif32
+framework = arduino
+board = esp32-c3-devkitm-1
+board_build.mcu = esp32c3
+board_build.f_cpu = 160000000L
+board_build.flash_mode = dio
+board_build.partitions = default.csv
+monitor_speed = 115200
+monitor_filters = time, default, esp32_exception_decoder
+upload_speed = 921600
+# NOTE: Need these two ARDUIO_USB modes to work with serial
+build_flags =
+    -Os
+    -I src
+    -D ARDUINO_ESP32C3_DEV
+    -D CONFIG_IDF_TARGET_ESP32C3
+    -D ARDUINO_USB_MODE=1
+    -D ARDUINO_USB_CDC_ON_BOOT=1
+lib_deps =
+    elapsedMillis
diff --git a/experiment/src/main.cpp b/experiment/src/main.cpp
new file mode 100644
index 0000000..78f13f7
--- /dev/null
+++ b/experiment/src/main.cpp
@@ -0,0 +1,397 @@
+/*
+
+TODO
+
+*/
+
+#include <Arduino.h>
+#include <BLEDevice.h>
+#include <BLEAdvertisedDevice.h>
+#include <BLEScan.h>
+#include <aes/esp_aes.h>  // AES decryption
+
+typedef struct {
+  char charMacAddr[13];       // 12 character MAC + \0 (initialized as quoted strings below for convenience)
+  char charKey[33];           // 32 character keys + \0 (initialized as quoted strings below for convenience)
+  char comment[16];           // 16 character comment (name) for printing during setup()
+  byte byteMacAddr[6];        // 6 bytes for MAC - initialized by setup() from quoted strings
+  byte byteKey[16];           // 16 bytes for encryption key - initialized by setup() from quoted strings
+  char cachedDeviceName[32];  // 31 characters + \0 (filled in as we receive advertisements)
+} solarController;
+
+solarController solarControllers[] = {
+  // { { .charMacAddr = "e64559783cfb" }, { .charKey = "3fa658aded4f309b9bc17a2318cb1f56" }, { .comment = "ScottTrailer" } },
+  { { .charMacAddr = "e405423414f3" }, { .charKey = "0ec3adf7433dd61793ff2f3b8ad32ed8" }, { .comment = "Test" } },
+};
+int  knownSolarControllerCount = sizeof(solarControllers) / sizeof(solarControllers[0]);
+
+BLEScan *pBLEScan;
+
+#define AES_KEY_BITS 128
+int scanTime = 1;  //In seconds
+
+byte hexCharToByte(char hexChar) {
+  if (hexChar >= '0' && hexChar <='9') {          // 0-9
+    hexChar=hexChar - '0';
+  }
+  else if (hexChar >= 'a' && hexChar <= 'f') {   // a-f
+    hexChar=hexChar - 'a' + 10;
+  }
+  else if (hexChar >= 'A' && hexChar <= 'F') {  // A-F
+    hexChar=hexChar - 'A' + 10;
+  }
+  else {
+    hexChar=255;
+  }
+
+  return hexChar;
+}
+
+// Decryption keys and MAC addresses obtained from the VictronConnect app will be
+// a string of hex digits like this:
+//
+//   f4116784732a
+//   dc73cb155351cf950f9f3a958b5cd96f
+//
+// Split that up and turn it into an array whose equivalent definition would be like this:
+//
+//   byte key[]={ 0xdc, 0x73, 0xcb, ... 0xd9, 0x6f };
+//
+void hexCharStrToByteArray(char * hexCharStr, byte * byteArray) {
+  bool returnVal=false;
+
+  int hexCharStrLength=strlen(hexCharStr);
+
+  // There are simpler ways of doing this without the fancy nibble-munching,
+  // but I do it this way so I parse things like colon-separated MAC addresses.
+  // BUT: be aware that this expects digits in pairs and byte values need to be
+  // zero-filled. i.e., a MAC address like 8:0:2b:xx:xx:xx won't come out the way
+  // you want it.
+  int byteArrayIndex=0;
+  bool oddByte=true;
+  byte hiNibble;
+  for (int i=0; i<hexCharStrLength; i++) {
+    byte nibble=hexCharToByte(hexCharStr[i]);
+    if (nibble!=255) {
+      if (oddByte) {
+        hiNibble=nibble;
+      } else {
+        byteArray[byteArrayIndex]=(hiNibble<<4) | nibble;
+        byteArrayIndex++;
+      }
+      oddByte=!oddByte;
+    }
+  }
+  // do we have a leftover nibble? I guess we'll assume it's a low nibble?
+  if (! oddByte) {
+    byteArray[byteArrayIndex]=hiNibble;
+  }
+}
+
+// Victron docs on the manufacturer data in advertisement packets can be found at:
+//   https://community.victronenergy.com/storage/attachments/48745-extra-manufacturer-data-2022-12-14.pdf
+//
+
+// Usage/style note: I use uint16_t in places where I need to force 16-bit unsigned integers
+// instead of whatever the compiler/architecture might decide to use. I might not need to do
+// the same with byte variables, but I'll do it anyway just to be at least a little consistent.
+
+// Must use the "packed" attribute to make sure the compiler doesn't add any padding to deal with
+// word alignment.
+typedef struct {
+  uint8_t deviceState;
+  uint8_t errorCode;
+  int16_t batteryVoltage;
+  int16_t batteryCurrent;
+  uint16_t todayYield;
+  uint16_t inputPower;
+  uint8_t outputCurrentLo;  // Low 8 bits of output current (in 0.1 Amp increments)
+  uint8_t outputCurrentHi;  // High 1 bit of ourput current (must mask off unused bits)
+  uint8_t unused[4];
+} __attribute__((packed)) victronPanelData;
+
+typedef struct {
+  uint16_t vendorID;                 // vendor ID
+  uint8_t beaconType;                // Should be 0x10 (Product Advertisement) for the packets we want
+  uint8_t unknownData1[3];           // Unknown data
+  uint8_t victronRecordType;         // Should be 0x01 (Solar Charger) for the packets we want
+  uint16_t nonceDataCounter;         // Nonce
+  uint8_t encryptKeyMatch;           // Should match pre-shared encryption key byte 0
+  uint8_t victronEncryptedData[21];  // (31 bytes max per BLE spec - size of previous elements)
+  uint8_t nullPad;                   // extra byte because toCharArray() adds a \0 byte.
+} __attribute__((packed)) victronManufacturerData;
+
+int bestRSSI = -200;
+int selectedSolarControllerIndex = -1;
+
+time_t lastLEDBlinkTime=0;
+time_t lastTick=0;
+int displayRotation=3;
+bool packetReceived=false;
+
+char chargeStateNames[][6] = {
+  "  off",
+  "   1?",
+  "   2?",
+  " bulk",
+  "  abs",
+  "float",
+  "   6?",
+  "equal"
+};
+
+class MyAdvertisedDeviceCallbacks : public BLEAdvertisedDeviceCallbacks {
+    void onResult(BLEAdvertisedDevice advertisedDevice) {
+
+      #define manDataSizeMax 31     // BLE specs say no more than 31 bytes, but see comments below!
+
+      // See if we have manufacturer data and then look to see if it's coming from a Victron device.
+      if (advertisedDevice.haveManufacturerData() == true) {
+        uint8_t manCharBuf[manDataSizeMax+1];
+        std::string manData = advertisedDevice.getManufacturerData(); // lib code returns std::string
+        int manDataSize=manData.length(); // This does not include a null at the end.
+
+        Serial.printf("Manufacturer data lengt=%d\n", manData.length());
+        Serial.printf("Struct Size=%d\n", sizeof(victronManufacturerData));
+
+        // Limit size just in case we get a malformed packet.
+        if (manDataSize > manDataSizeMax) {
+          Serial.printf("  Note: Truncating malformed %2d byte manufacturer data to max %d byte array size\n",manDataSize,manDataSizeMax);
+          manDataSize=manDataSizeMax;
+        }
+        // Now copy the data from the String to a byte array. Must have the +1 so we
+        // don't lose the last character to the null terminator.
+        manData.copy((char *)manCharBuf, manDataSize + 1);
+
+        // Now let's use a struct to get to the data more cleanly.
+        victronManufacturerData * vicData=(victronManufacturerData *)manCharBuf;
+
+        // ignore this packet if the Vendor ID isn't Victron.
+        if (vicData->vendorID!=0x02e1) {
+          return;
+        }
+
+        // ignore this packet if it isn't type 0x01 (Solar Charger).
+        if (vicData->victronRecordType != 0x01) {
+          return;
+        }
+
+        // Get the MAC address of the device we're hearing, and then use that to look up the encryption key
+        // for the device.
+        //
+        // We go through a bit of trouble here to turn the String MAC address that we get from the BLE
+        // code ("08:00:2b:xx:xx:xx") into a byte array. I'm divided on this... I could have just (and still might!)
+        // left this as a string and just done a strcmp() match. This would have saved me some coding and execution time
+        // in exchange for having to format the MAC addresses in my solarControllers list using the embedded colons.
+        char receivedMacStr[18];
+        strcpy(receivedMacStr,advertisedDevice.getAddress().toString().c_str());
+
+        byte receivedMacByte[6];
+        hexCharStrToByteArray(receivedMacStr,receivedMacByte);
+
+        int solarControllerIndex=-1;
+        for (int trySolarControllerIndex=0; trySolarControllerIndex<knownSolarControllerCount; trySolarControllerIndex++) {
+          bool matchedMac=true;
+          for (int i=0; i<6; i++) {
+            if (receivedMacByte[i] != solarControllers[trySolarControllerIndex].byteMacAddr[i]) {
+              matchedMac=false;
+              break;
+            }
+          }
+          if (matchedMac) {
+            solarControllerIndex=trySolarControllerIndex;
+            break;
+          }
+        }
+
+        // Get the device name (if there's one in this packet).
+        char deviceName[32]; // 31 characters + \0
+        strcpy(deviceName,"(unknown device name)");
+        bool deviceNameFound=false;
+        if (advertisedDevice.haveName()) {
+          // This works the same whether getName() returns String or std::string.
+          strcpy(deviceName,advertisedDevice.getName().c_str());
+
+          // This is prone to breaking because it's not very sophisticated. It's meant to
+          // strip off "SmartSolar" if it's at the beginning of the name, but will do
+          // ugly things if someone has put it elsewhere like "My SmartSolar Charger".
+          if (strstr(deviceName,"SmartSolar ") == deviceName) {
+            strcpy(deviceName,deviceName+11);
+          }
+          deviceNameFound=true;
+        }
+
+        // We didn't do this test earlier because we want to print out a name - if we got one.
+        if (solarControllerIndex == -1) {
+          Serial.printf("Discarding packet from unconfigured Victron SmartSolar %s at MAC %s\n",deviceName,receivedMacStr);
+          return;
+        }
+
+        // If we found a device name, cache it for later display.
+        if (deviceNameFound) {
+          strcpy(solarControllers[solarControllerIndex].cachedDeviceName,deviceName);
+        }
+
+        // The manufacturer data from Victron contains a byte that's supposed to match the first byte
+        // of the device's encryption key. If they don't match, when we don't have the right key for
+        // this device and we just have to throw the data away. ALTERNATELY, we can go ahead and decrypt
+        // the data - incorrectly - and use the crazy values to indicate that we have a problem.
+        if (vicData->encryptKeyMatch != solarControllers[solarControllerIndex].byteKey[0]) {
+          Serial.printf("Encryption key mismatch for %s at MAC %s\n",
+            solarControllers[solarControllerIndex].cachedDeviceName,receivedMacStr);
+          return;
+        }
+
+        // Get the signal strength (RSSI) of the beacon.
+        int RSSI=advertisedDevice.getRSSI();
+
+        // If we're showing our data on our integrated graphics hardware,
+        // then show only the SmartSolar device with the strongest signal.
+        // I debated on whether to do this with "#if defined..." for conditional compilation
+        // or I should do this with a boolean "using graphics hardware" variable and a regular
+        // "if". I decided on #if, but I might change my mind later.
+          // Get the beacon's RSSI (signal strength). If it's stronger than other beacons we've received,
+          // then lock on to this SmartSolar and don't display beacons from others anymore.
+          if (selectedSolarControllerIndex==solarControllerIndex) {
+            if (RSSI > bestRSSI) {
+              bestRSSI=RSSI;
+            }
+          } else {
+            if (RSSI > bestRSSI) {
+              selectedSolarControllerIndex=solarControllerIndex;
+              Serial.printf("Selected Victon SmartSolar %s at MAC %s as preferred device based on RSSI %d\n",
+                solarControllers[solarControllerIndex].cachedDeviceName,receivedMacStr,RSSI);
+            } else {
+              Serial.printf("Discarding RSSI-based non-selected Victon SmartSolar %s at MAC %s\n",
+                solarControllers[solarControllerIndex].cachedDeviceName,receivedMacStr);
+              return;
+            }
+          }
+
+        // Now that the packet received has met all the criteria for being displayed,
+        // let's decrypt and decode the manufacturer data.
+
+        byte inputData[16];
+        byte outputData[16]={0};
+        victronPanelData * victronData = (victronPanelData *) outputData;
+
+        // The number of encrypted bytes is given by the number of bytes in the manufacturer
+        // data as a while minus the number of bytes (10) in the header part of the data.
+        int encrDataSize=manDataSize-10;
+        for (int i=0; i<encrDataSize; i++) {
+          inputData[i]=vicData->victronEncryptedData[i];   // copy for our decrypt below while I figure this out.
+        }
+
+        esp_aes_context ctx;
+        esp_aes_init(&ctx);
+
+        auto status = esp_aes_setkey(&ctx, solarControllers[solarControllerIndex].byteKey, AES_KEY_BITS);
+        if (status != 0) {
+          Serial.printf("  Error during esp_aes_setkey operation (%i).\n",status);
+          esp_aes_free(&ctx);
+          return;
+        }
+
+        byte data_counter_lsb=(vicData->nonceDataCounter) & 0xff;
+        byte data_counter_msb=((vicData->nonceDataCounter) >> 8) & 0xff;
+        u_int8_t nonce_counter[16] = {data_counter_lsb, data_counter_msb, 0};
+        u_int8_t stream_block[16] = {0};
+
+        size_t nonce_offset=0;
+        status = esp_aes_crypt_ctr(&ctx, encrDataSize, &nonce_offset, nonce_counter, stream_block, inputData, outputData);
+        if (status != 0) {
+          Serial.printf("Error during esp_aes_crypt_ctr operation (%i).",status);
+          esp_aes_free(&ctx);
+          return;
+        }
+        esp_aes_free(&ctx);
+
+        byte deviceState=victronData->deviceState;  // this is really more like "Charger State"
+        byte errorCode=victronData->errorCode;
+        float batteryVoltage=float(victronData->batteryVoltage)*0.01;
+        float batteryCurrent=float(victronData->batteryCurrent)*0.1;
+        float todayYield=float(victronData->todayYield)*0.01*1000;
+        uint16_t inputPower=victronData->inputPower;  // this is in watts; no conversion needed
+
+
+        // Getting the output current takes some magic.
+        int integerOutputCurrent=((victronData->outputCurrentHi & 0x01)<<9) | victronData->outputCurrentLo;
+        float outputCurrent=float(integerOutputCurrent)*0.1;
+
+        // I don't know why, but every so often we'll get half-corrupted data from the Victron.
+        // Towards the goal of filtering out this noise, I've found that I've rarely (if ever) seen
+        // corrupted data when the 'unused' bits of the outputCurrent MSB equal 0xfe. We'll use this
+        // as a litmus test here.
+        byte unusedBits=victronData->outputCurrentHi & 0xfe;
+        if (unusedBits != 0xfe) {
+          return;
+        }
+
+        // The Victron docs say Device State but it's really a Charger State.
+        char chargeStateName[6];
+        sprintf(chargeStateName,"%4d?",deviceState);
+        if (deviceState >=0 && deviceState<=7) {
+          strcpy(chargeStateName,chargeStateNames[deviceState]);
+        }
+
+        Serial.printf("%-31s  Battery: %6.2f Volts %6.2f Amps  Solar: %6d Watts  Yield: %4.0f Wh  Load: %5.1f Amps  Charger: %-13s Err: %2d RSSI: %d\n",
+          solarControllers[solarControllerIndex].cachedDeviceName,
+          batteryVoltage, batteryCurrent,
+          inputPower, todayYield,
+          outputCurrent, chargeStateName, errorCode, RSSI
+        );
+
+        char screenDeviceName[14]; // 13 characters plus /0
+        strncpy(screenDeviceName,solarControllers[solarControllerIndex].cachedDeviceName,13);
+        screenDeviceName[13]='\0'; // make sure we have a null byte at the end.
+        /*
+        sh3dNbDisplay.line1 = String("Name:    ") + String(screenDeviceName);
+        sh3dNbDisplay.line2 = String("Battery: ") + String(batteryVoltage) + String("V");
+        sh3dNbDisplay.line3 = String("Charge:  ") + String(inputPower) + String("W ") + String(todayYield) + String("Wh");
+        sh3dNb.setMessage(sh3dNb.iso8601());
+        sh3dNbDisplay.update();
+        */
+
+        packetReceived=true;
+      }
+    }
+};
+
+void setup() {
+    Serial.begin(115200);
+    Serial.println("Basic test");
+
+    // VICTRON BLUETOOTH
+    for (int i = 0; i < knownSolarControllerCount; i++) {
+        hexCharStrToByteArray(solarControllers[i].charMacAddr, solarControllers[i].byteMacAddr);
+        hexCharStrToByteArray(solarControllers[i].charKey, solarControllers[i].byteKey);
+        strcpy(solarControllers[i].cachedDeviceName, "(unknown)");
+    }
+
+    for (int i = 0; i < knownSolarControllerCount; i++) {
+        Serial.printf("  %-16s", solarControllers[i].comment);
+        Serial.printf("  Mac:   ");
+        for (int j = 0; j < 6; j++) {
+            Serial.printf(" %2.2x", solarControllers[i].byteMacAddr[j]);
+        }
+        Serial.printf("    Key: ");
+        for (int j = 0; j < 16; j++) {
+            Serial.printf("%2.2x", solarControllers[i].byteKey[j]);
+        }
+    }
+
+    BLEDevice::init("");
+    pBLEScan = BLEDevice::getScan(); //create new scan
+    pBLEScan->setAdvertisedDeviceCallbacks(new MyAdvertisedDeviceCallbacks());
+    pBLEScan->setActiveScan(true); //active scan uses more power, but gets results faster
+    pBLEScan->setInterval(100);
+    pBLEScan->setWindow(99); // less or equal setInterval value
+}
+
+
+void loop() {
+    Serial.println("tick");
+    BLEScanResults foundDevices = pBLEScan->start(scanTime, false);
+    pBLEScan->clearResults(); // delete results fromBLEScan buffer to release memory
+    delay(100);
+}
diff --git a/src/VictronBLE.cpp b/src/VictronBLE.cpp
index dcea477..88ca72e 100644
--- a/src/VictronBLE.cpp
+++ b/src/VictronBLE.cpp
@@ -212,6 +212,7 @@ void VictronBLE::processDevice(BLEAdvertisedDevice advertisedDevice) {
     if (mfgData.length() < 2) {
         return;
     }
+    debugPrint("Manufacturer Length = " + String(mfgData.length()));
 
     // XXX Use struct like code in Sh3dNg
 
@@ -246,7 +247,7 @@ bool VictronBLE::parseAdvertisement(const uint8_t* manufacturerData, size_t len,
 
     // Verify minimum size for victronManufacturerData struct
     if (len < sizeof(victronManufacturerData)) {
-        debugPrint("Manufacturer data too short: " + String(len) + " bytes");
+        debugPrint("Manufacturer data too short: " + String(len) + " bytes, expected: " + String(sizeof(victronManufacturerData)));
         return false;
     }