diff --git a/Config.cpp b/Config.cpp
index 8d90f35..d84ac44 100644
--- a/Config.cpp
+++ b/Config.cpp
@@ -109,8 +109,8 @@ void Config::initialize() {
     for (int i = 0; i < 4; i++) {
       Config::setFloat(Config::THERMOMETER_CAL[i], 1.0);
     }
-    Config::setBool(Config::THERMOMETER_DEBUG, true);
-    Config::setBool(Config::THERMOMETER_INFO, true);
+    Config::setBool(Config::THERMOMETER_DEBUG, false);
+    Config::setBool(Config::THERMOMETER_INFO, false);
 
 
     Config::setUChar(Config::METERBUSCLIENT_ADDRESS, 0);
diff --git a/Resources.h b/Resources.h
index 696c23d..1a2b0bd 100644
--- a/Resources.h
+++ b/Resources.h
@@ -62,6 +62,10 @@ const uint8_t THERMVALUES_HELP_KEY = 46;
 const uint8_t THERMCALIBRATE_HELP_KEY = 47;
 const uint8_t CALIBRATION_ZEOR_MODE_HINT_KEY = 48;
 const uint8_t MBC_CONFIG_HELP_KEY = 49;
+const uint8_t MBC_INVALID_FRAME_KEY = 50;
+const uint8_t MBC_NO_VALID_FRAME_KEY = 51;
+const uint8_t MBC_INVALID_CHECKSUM_KEY = 52;
+const uint8_t MBC_NOT_FOR_ME_KEY = 53;
 
 
 const String TEXT_RESOURCES[] = {
@@ -115,6 +119,10 @@ const String TEXT_RESOURCES[] = {
     "Thermometer calibration operations",
     "No, no, we are in calibration zero mode, so directly switch to state 20",
     "MeterBus Client Configuration",
+    "Invalid frame",
+    "No valid frame available",
+    "Invalid checksum",
+    "Not for me but for ",
 
 };
 
diff --git a/ThermometerPro.cpp b/ThermometerPro.cpp
index 6c2a384..c837120 100644
--- a/ThermometerPro.cpp
+++ b/ThermometerPro.cpp
@@ -5,33 +5,31 @@
 #include "thermometer.h"
 #include "Config.h"
 #include "spi.h"
+// #include "meterBusClient.h"
 
 
-#define ENABLE_CONFIGURATION_INVALID_CMD 1
-
 
 static CmdServer cmdServer(&Serial);
-#ifdef ENABLE_CONFIGURATION_INVALID_CMD
-  static ConfigInvalidateCmd configInvalidateCmd;
-#endif
+// static ConfigInvalidateCmd configInvalidateCmd;
 static Uptime uptime;
 static Thermometer thermometer;
-
+// static MeterBusClient meterBusClient;
 
 void setup() {
   Serial.begin(9600);
 
+  // Config::initialize();
+  delay(5000);
+  Serial.println("Hello world!");
 
-  Config::initialize();
 
   spiInit();
 
   cmdServer.begin();
-#ifdef ENABLE_CONFIGURATION_INVALID_CMD
-  configInvalidateCmd.registerYourself(&cmdServer);
-#endif
+  //configInvalidateCmd.registerYourself(&cmdServer);
   uptime.begin(&cmdServer);
   thermometer.begin(&cmdServer);
+//  meterBusClient.begin(&cmdServer);
 }
 
 
@@ -39,4 +37,5 @@ void loop() {
   cmdServer.exec();
   uptime.exec();
   thermometer.exec();
+//  meterBusClient.exec();
 }
diff --git a/meterBusClient.cpp b/meterBusClient.cpp
index c8530ff..b082184 100644
--- a/meterBusClient.cpp
+++ b/meterBusClient.cpp
@@ -5,6 +5,9 @@
  *      Author: wn
  */
 
+
+#if 0
+
 #include "meterBusClient.h"
 
 
@@ -19,6 +22,7 @@ void MeterBusClient::begin(CmdServer *cmdServer) {
 
 
   setAddress(Config::getUChar(Config::METERBUSCLIENT_ADDRESS));
+
 }
 
 void MeterBusClient::setAddress(unsigned char a) {
@@ -44,7 +48,7 @@ unsigned char MeterBusClient::getAddress() {
  *
  * Control Frame:
  *   Start      68h
- *   Length
+ *   Length     = 3
  *   Length
  *   Start      68h
  *   C-Field
@@ -74,24 +78,170 @@ unsigned char MeterBusClient::getAddress() {
  */
 
 
-void MeterBusClient::exec() {
-  static uint8_t state = 0;
-  bool done = false;
-
-  if (Serial3.available()) {
-    int chi;
-    while ((chi = Serial3.read()) != -1) {
-      char ch = (char) chi;
-      switch (state) {
-      case 0:
-        break;
-      }
-
-      if (done) {
-      }
-    }
+bool isChecksumValid(MeterBusFrame frame) {
+  unsigned char ctrlsum = frame.aField + frame.cField + frame.ciField;
+  for (int i = 0; i < (frame.length - 3); i++) {
+    ctrlsum += frame.userData[i];
   }
+  return (ctrlsum == frame.checksum);
+}
 
+void MeterBusClient::handleFrame() {
+  if (m_frame.aField != getAddress()) {
+    Serial.print(getResource(MBC_NOT_FOR_ME_KEY)); Serial.print((int)m_frame.aField, 16); Serial.println();
+  } else if (! isChecksumValid(m_frame)) {
+    Serial.println(getResource(MBC_INVALID_CHECKSUM_KEY));
+  } else {
+    // handle the frame
+    Serial.print("s: "); Serial.println(m_frame.startDelimiter, 16);
+    Serial.print("l: "); Serial.println(m_frame.length, 16);
+    Serial.print("c: "); Serial.println(m_frame.cField, 16);
+    Serial.print("a: "); Serial.println(m_frame.ciField, 16);
+  }
 }
 
 
+typedef enum {
+  STATE_START, STATE_IDLE, STATE_SHORT_FRAME, STATE_LONG_CTRL_FRAME, STATE_HANDLE, STATE_INVALID, STATE_FOREIGN, STATE_DONE
+} e_meterBusClientState;
+
+typedef enum {
+  SUBSTATE_LENGTH, SUBSTATE_LENGTH_REPEAT, SUBSTATE_START_REPEAT, SUBSTATE_C_FIELD, SUBSTATE_A_FIELD, SUBSTATE_CI_FIELD,
+  SUBSTATE_USERDATA, SUBSTATE_CHECKSUM, SUBSTATE_STOP
+} e_meterBusClientSubState;
+
+
+void MeterBusClient::exec() {
+  static e_meterBusClientState state = STATE_IDLE;
+  static e_meterBusClientSubState subState = SUBSTATE_LENGTH;
+  bool done = false;
+
+  int chi = Serial3.read();
+  char ch = (char) chi;
+
+  switch (state) {
+  case STATE_START:
+    m_frame.startDelimiter = 0;
+    m_frame.length = 0;
+    m_frame.cField = 0;
+    m_frame.aField = 0;
+    m_frame.ciField = 0;
+    memset(m_frame.userData, 0, sizeof(m_frame.userData));
+    m_frame.valid = false;
+    state = STATE_IDLE;
+    break;
+
+  case STATE_IDLE:
+    if (chi != -1) {
+      if (ch == 0x10) {
+        m_frame.startDelimiter = 0x10;
+        state = STATE_SHORT_FRAME;
+        subState = SUBSTATE_C_FIELD;
+      } else if (ch == 0x68)  {
+        m_frame.startDelimiter = 0x68;
+        state = STATE_LONG_CTRL_FRAME;
+        subState = SUBSTATE_LENGTH;
+      } else {
+        state = STATE_INVALID;
+      }
+    }
+    break;
+
+  case STATE_SHORT_FRAME:
+    if (chi != -1) {
+      if (subState == SUBSTATE_C_FIELD) {
+        m_frame.cField = ch;
+        subState = SUBSTATE_A_FIELD;
+      } else if (subState == SUBSTATE_A_FIELD) {
+        m_frame.aField = ch;
+        subState  = SUBSTATE_CHECKSUM;
+      } else if (subState == SUBSTATE_STOP) {
+        if (ch == 0x16) {
+          m_frame.valid = true;
+          state = STATE_HANDLE;
+        } else {
+          state = STATE_INVALID;
+        }
+      }
+    }
+    break;
+
+  case STATE_LONG_CTRL_FRAME:
+    if (chi != -1) {
+      if (subState == SUBSTATE_LENGTH) {
+        m_frame.length = ch;
+        if (m_frame.length < 3) {
+          state = STATE_INVALID;
+        } else {
+          subState = SUBSTATE_LENGTH_REPEAT;
+        }
+      } else if (subState == SUBSTATE_LENGTH_REPEAT) {
+        if (ch == m_frame.length) {
+          subState = SUBSTATE_START_REPEAT;
+        } else {
+          state = STATE_INVALID;
+        }
+      } else if (subState == SUBSTATE_START_REPEAT) {
+        if (ch == 0x68) {
+          subState = SUBSTATE_C_FIELD;
+        } else {
+          state = STATE_INVALID;
+        }
+      } else if (subState == SUBSTATE_C_FIELD) {
+        m_frame.cField = ch;
+        subState = SUBSTATE_A_FIELD;
+      } else if (subState == SUBSTATE_A_FIELD) {
+        m_frame.aField = ch;
+        subState = SUBSTATE_CI_FIELD;
+      } else if (subState == SUBSTATE_CI_FIELD) {
+        m_frame.ciField = ch;
+        if (m_frame.length == 3) {
+          subState = SUBSTATE_CHECKSUM;
+        } else {
+          subState = SUBSTATE_USERDATA;
+        }
+      } else if (subState == SUBSTATE_USERDATA) {
+        // count and collect
+        // then: subState = SUBSTATE_CHECKSUM
+      } else if (subState == SUBSTATE_CHECKSUM) {
+        m_frame.checksum = ch;
+        subState = SUBSTATE_STOP;
+      } else if (subState == SUBSTATE_STOP) {
+        if (ch == 0x16) {
+          m_frame.valid = true;
+          state = STATE_HANDLE;
+        } else {
+          state = STATE_INVALID;
+        }
+      }
+    }
+    break;
+
+  case STATE_INVALID:
+    Serial.println(getResource(MBC_INVALID_FRAME_KEY));
+    state = STATE_START;
+    break;
+
+  case STATE_HANDLE:
+    if (m_frame.valid) {
+      handleFrame();
+    } else {
+      Serial.println(getResource(MBC_NO_VALID_FRAME_KEY));
+    }
+    state = STATE_DONE;
+    break;
+
+  case STATE_FOREIGN:
+    // not for me message
+    state = STATE_START;
+    break;
+
+  case STATE_DONE:
+    // may be another useful message
+    state = STATE_START;
+    break;
+  }
+}
+
+#endif
+
diff --git a/meterBusClient.h b/meterBusClient.h
index 18209fa..aa614ec 100644
--- a/meterBusClient.h
+++ b/meterBusClient.h
@@ -9,6 +9,8 @@
 #define METERBUSCLIENT_H_
 
 
+#if 0
+
 #include "cmd.h"
 #include "Config.h"
 #include "Resources.h"
@@ -29,6 +31,38 @@ private:
 
 
 
+struct MeterBusFrame {
+ /*
+  * Short Frame:
+  *   Start      10h
+  *   C-Field
+  *   A-Field
+  *   Check-Sum
+  *   Stop       16h
+  *
+  * Long Frame:
+  *   Start      68h
+  *   Length
+  *   Length
+  *   Start      68h
+  *   C-Field
+  *   A-Field
+  *   CI-Field
+  *   User-Data
+  *   Check-Sum
+  *   Stop       16h
+  *
+  */
+  unsigned char startDelimiter;
+  unsigned char length;
+  unsigned char cField;
+  unsigned char aField;
+  unsigned char ciField;
+  unsigned char userData[255];
+  unsigned char checksum;
+  bool valid;
+};
+
 
 class MeterBusClient {
 public:
@@ -40,7 +74,11 @@ private:
   unsigned char m_address;
   void setAddress(unsigned char address);
   unsigned char getAddress();
+  void handleFrame();
+  MeterBusFrame m_frame;
 };
 
+#endif
+
 
 #endif /* METERBUSCLIENT_H_ */