diff --git a/src/app.cpp b/src/app.cpp
index 571d933a..7f2fefd7 100644
--- a/src/app.cpp
+++ b/src/app.cpp
@@ -98,6 +98,7 @@ void app::setup() {
 //-----------------------------------------------------------------------------
 void app::loop(void) {
     mInnerLoopCb();
+    mImprov.tickSerial();
 }
 
 //-----------------------------------------------------------------------------
@@ -173,7 +174,7 @@ void app::regularTickers(void) {
     if (mConfig->plugin.display.type != 0)
         everySec(std::bind(&DisplayType::tickerSecond, &mDisplay), "disp");
     every(std::bind(&PubSerialType::tick, &mPubSerial), mConfig->serial.interval, "uart");
-    everySec(std::bind(&Improv::tickSerial, &mImprov), "impro");
+    //everySec(std::bind(&Improv::tickSerial, &mImprov), "impro");
 }
 
 //-----------------------------------------------------------------------------
diff --git a/src/utils/dbg.h b/src/utils/dbg.h
index 4716d7ae..53c9f79e 100644
--- a/src/utils/dbg.h
+++ b/src/utils/dbg.h
@@ -49,21 +49,23 @@
         #endif
 
         //template <class T>
-        inline void DBGPRINT(String str) { DSERIAL.print(str); if(NULL != mCb) mCb(str); }
+        inline void DBGPRINT(String str, bool ser = true) { if(ser) DSERIAL.print(str); if(NULL != mCb) mCb(str); }
         //template <class T>
-        inline void DBGPRINTLN(String str) { DBGPRINT(str); DBGPRINT(F("\r\n")); }
-        inline void DHEX(uint8_t b) {
-            if( b<0x10 ) DSERIAL.print(F("0"));
-            DSERIAL.print(b,HEX);
+        inline void DBGPRINTLN(String str, bool ser = true) { DBGPRINT(str); DBGPRINT(F("\r\n")); }
+        inline void DHEX(uint8_t b, bool ser = true) {
+            if(ser) {
+                if( b<0x10 ) DSERIAL.print(F("0"));
+                DSERIAL.print(b,HEX);
+            }
             if(NULL != mCb) {
                 if( b<0x10 ) mCb(F("0"));
                 mCb(String(b, HEX));
             }
         }
 
-        inline void DBGHEXLN(uint8_t b) {
-            DHEX(b);
-            DBGPRINT(F("\r\n"));
+        inline void DBGHEXLN(uint8_t b, bool ser = true) {
+            DHEX(b, ser);
+            DBGPRINT(F("\r\n"), ser);
         }
         /*inline void DHEX(uint16_t b) {
             if( b<0x10 ) DSERIAL.print(F("000"));
diff --git a/src/utils/improv.h b/src/utils/improv.h
index 2ed16599..c3b8c87c 100644
--- a/src/utils/improv.h
+++ b/src/utils/improv.h
@@ -25,15 +25,15 @@ class Improv {
             if(Serial.available() == 0)
                 return;
 
-            uint8_t buf[80];
-            uint8_t len = Serial.readBytes(buf, 80);
-            dumpBuf(buf, len);
+            uint8_t buf[40];
+            uint8_t len = Serial.readBytes(buf, 40);
 
-            if(!checkPaket(&buf[0], 13, [this](uint8_t type, uint8_t buf[], uint8_t len) {
+            if(!checkPaket(&buf[0], len, [this](uint8_t type, uint8_t buf[], uint8_t len) {
                 parsePayload(type, buf, len);
             })) {
-                DBGPRINT(F("checkHeader failed"));
+                DBGPRINTLN(F("check paket failed"));
             }
+            dumpBuf(buf, len);
         }
 
     private:
@@ -64,21 +64,24 @@ class Improv {
 
         void dumpBuf(uint8_t buf[], uint8_t len) {
             for(uint8_t i = 0; i < len; i++) {
-                DHEX(buf[i]);
-                DBGPRINT(" ");
+                DHEX(buf[i], false);
+                DBGPRINT(" ", false);
             }
-            DBGPRINTLN("");
+            DBGPRINTLN("", false);
         }
 
         inline uint8_t buildChecksum(uint8_t buf[], uint8_t len) {
             uint8_t calc = 0;
-            for(uint8_t i = 0; i < (len - 1); i++) {
+            for(uint8_t i = 0; i < len; i++) {
                 calc += buf[i];
             }
             return calc;
         }
 
         inline bool checkChecksum(uint8_t buf[], uint8_t len) {
+            /*DHEX(buf[len], false);
+            DBGPRINT(F(" == "), false);
+            DBGHEXLN(buildChecksum(buf, len), false);*/
             return ((buildChecksum(buf, len)) == buf[len]);
         }
 
@@ -93,7 +96,7 @@ class Improv {
             if(0x01 != buf[6])
                 return false;
 
-            if(!checkChecksum(buf, (6+3 + buf[9])))
+            if(!checkChecksum(buf, (9 + buf[8])))
                 return false;
 
             cb(buf[7], &buf[9], buf[8]);
@@ -151,17 +154,16 @@ class Improv {
             buf[5] = 'V';
             buf[6] = 1; // protocol version
 
-            buf[len] = buildChecksum(buf, (len+1));
+            buf[len] = buildChecksum(buf, len);
             len++;
-            dumpBuf(buf, len);
             Serial.write(buf, len);
+            dumpBuf(buf, len);
         }
 
         void parsePayload(uint8_t type, uint8_t buf[], uint8_t len) {
-            DBGPRINTLN(F("parsePayload"));
             if(TYPE_RPC == type) {
                 if(GET_CURRENT_STATE == buf[0])
-                    setState(0x00);
+                    setState(STATE_AUTHORIZED);
                 else if(GET_DEVICE_INFO == buf[0])
                     sendDevInfo();
             }