diff --git a/README.md b/README.md
index 0d50f9a0d..c048c4719 100644
--- a/README.md
+++ b/README.md
@@ -1,7 +1,7 @@
 ## Sonoff-Tasmota
 Provide ESP8266 based Sonoff by [iTead Studio](https://www.itead.cc/) and ElectroDragon IoT Relay with Serial, Web and MQTT control allowing 'Over the Air' or OTA firmware updates using Arduino IDE.
 
-Current version is **5.7.1d** - See [sonoff/_releasenotes.ino](https://github.com/arendst/Sonoff-Tasmota/blob/development/sonoff/_releasenotes.ino) for change information.
+Current version is **5.7.1e** - See [sonoff/_releasenotes.ino](https://github.com/arendst/Sonoff-Tasmota/blob/development/sonoff/_releasenotes.ino) for change information.
 
 ### ATTENTION All versions
 
diff --git a/sonoff/_releasenotes.ino b/sonoff/_releasenotes.ino
index 8a405c290..3ebcdb2ee 100644
--- a/sonoff/_releasenotes.ino
+++ b/sonoff/_releasenotes.ino
@@ -1,7 +1,11 @@
-/* 5.7.1d
+/* 5.7.1e
+ * Add Sonoff SC debug information
+ * Change syslog service
+ *
+ * 5.7.1d
  * Fix watchdog timeout caused by lack of stack space by now using global buffers (#853)
  * Removed webserver syslog disable as now no longer needed
- * Increased default MQTT message size from 368 to 405 bytes while keeping DMQTT_MAX_PACKET_SIZE = 512 (because we can)
+ * Increased default MQTT message size from 368 to 405 bytes while keeping MQTT_MAX_PACKET_SIZE = 512 (because we can)
  * Fix MQTT Offline or Remove MQTT retained topic code
  * Allow command SwitchTopic in group mode (#861)
  * Allow command SwitchMode if no switches are defined (#861)
diff --git a/sonoff/language/en-GB.h b/sonoff/language/en-GB.h
index dedb22a3b..3208e12bc 100644
--- a/sonoff/language/en-GB.h
+++ b/sonoff/language/en-GB.h
@@ -175,6 +175,7 @@
 #define D_TOGGLE "Toggle"
 #define D_TOPIC "Topic"
 #define D_TOTAL "Total"
+#define D_TRANSMIT "Transmit"
 #define D_TRUE "True"
 #define D_TYPE "Type"
 #define D_UNKNOWN "Unknown"
@@ -478,7 +479,7 @@
 #define D_LOG_APPLICATION "APP: "
 #define D_LOG_BRIDGE "BRG: "
 #define D_LOG_CONFIG "CFG: "
-#define D_LOG_COMMAND "CND: "
+#define D_LOG_COMMAND "CMD: "
 #define D_LOG_DHT "DHT: "
 #define D_LOG_DOMOTICZ "DOM: "
 #define D_LOG_DSB "DSB: "
@@ -494,6 +495,7 @@
 #define D_LOG_UPLOAD "UPL: "
 #define D_LOG_UPNP "UPP: "
 #define D_LOG_WIFI "WIF: "
+#define D_LOG_SERIAL "SER: "
 
 // Result
 #define D_RSLT_RESULT "RESULT"
diff --git a/sonoff/language/nl-NL.h b/sonoff/language/nl-NL.h
index eece900a5..52eb47fc9 100644
--- a/sonoff/language/nl-NL.h
+++ b/sonoff/language/nl-NL.h
@@ -175,6 +175,7 @@
 #define D_TOGGLE "Toggle"  // Wissel, Tuimel
 #define D_TOPIC "Topic"  // Onderwerp
 #define D_TOTAL "Totaal"
+#define D_TRANSMIT "Verzend"
 #define D_TRUE "Waar"
 #define D_TYPE "Soort"
 #define D_UNKNOWN "Onbekend"
@@ -478,7 +479,7 @@
 #define D_LOG_APPLICATION "APP: "
 #define D_LOG_BRIDGE "BRG: "
 #define D_LOG_CONFIG "CFG: "
-#define D_LOG_COMMAND "CND: "
+#define D_LOG_COMMAND "CMD: "
 #define D_LOG_DHT "DHT: "
 #define D_LOG_DOMOTICZ "DOM: "
 #define D_LOG_DSB "DSB: "
@@ -494,6 +495,7 @@
 #define D_LOG_UPLOAD "UPL: "
 #define D_LOG_UPNP "UPP: "
 #define D_LOG_WIFI "WIF: "
+#define D_LOG_SERIAL "SER: "
 
 // Result
 #define D_RSLT_RESULT "RESULTAAT"
diff --git a/sonoff/sonoff.ino b/sonoff/sonoff.ino
index 97c11fbbd..c50f8289d 100644
--- a/sonoff/sonoff.ino
+++ b/sonoff/sonoff.ino
@@ -25,7 +25,7 @@
     - Select IDE Tools - Flash Size: "1M (no SPIFFS)"
   ====================================================*/
 
-#define VERSION                0x05070104  // 5.7.1d
+#define VERSION                0x05070105  // 5.7.1e
 
 enum log_t   {LOG_LEVEL_NONE, LOG_LEVEL_ERROR, LOG_LEVEL_INFO, LOG_LEVEL_DEBUG, LOG_LEVEL_DEBUG_MORE, LOG_LEVEL_ALL};
 enum week_t  {Last, First, Second, Third, Fourth};
@@ -158,7 +158,6 @@ enum opt_t   {P_HOLD_TIME, P_MAX_POWER_RETRY, P_MAX_PARAM8};   // Index in sysCf
 
 #include <PubSubClient.h>                   // MQTT
 #ifndef MESSZ
-//  #define MESSZ                368          // Max number of characters in JSON message string (4 x DS18x20 sensors)
   #define MESSZ                405          // Max number of characters in JSON message string (4 x DS18x20 sensors)
 #endif
 
@@ -218,13 +217,9 @@ TimeChangeRule mySTD = { TIME_STD };  // Standard Time
 int Baudrate = APP_BAUDRATE;          // Serial interface baud rate
 byte SerialInByte;                    // Received byte
 int SerialInByteCounter = 0;          // Index in receive buffer
-char serialInBuf[INPUT_BUFFER_SIZE + 2];  // Receive buffer
 byte Hexcode = 0;                     // Sonoff dual input flag
 uint16_t ButtonCode = 0;              // Sonoff dual received code
 int16_t savedatacounter;              // Counter and flag for config save to Flash
-char Version[16];                     // Version string from VERSION define
-char Hostname[33];                    // Composed Wifi hostname
-char MQTTClient[33];                  // Composed MQTT Clientname
 uint8_t mqttcounter = 0;              // MQTT connection retry counter
 uint8_t fallbacktopic = 0;            // Use Topic or FallbackTopic
 unsigned long timerxs = 0;            // State loop timer
@@ -298,6 +293,10 @@ uint8_t pwm_idxoffset = 0;            // Allowed PWM command offset (change for
 
 boolean mDNSbegun = false;
 
+char Version[16];                     // Version string from VERSION define
+char Hostname[33];                    // Composed Wifi hostname
+char MQTTClient[33];                  // Composed MQTT Clientname
+char serialInBuf[INPUT_BUFFER_SIZE + 2];  // Receive buffer
 char mqtt_data[MESSZ];                // MQTT publish buffer
 char log_data[TOPSZ + MESSZ];         // Logging
 String Log[MAX_LOG_LINES];            // Web log buffer
diff --git a/sonoff/support.ino b/sonoff/support.ino
index 20c1b96a3..0ff8c4a8b 100644
--- a/sonoff/support.ino
+++ b/sonoff/support.ino
@@ -1146,11 +1146,15 @@ uint16_t getAdc0()
 
 void syslog()
 {
-  char str[TOPSZ + MESSZ];
+  // Destroys log_data
+  char syslog_preamble[64];  // Hostname + Id
 
   if (portUDP.beginPacket(sysCfg.syslog_host, sysCfg.syslog_port)) {
-    snprintf_P(str, sizeof(str), PSTR("%s ESP-%s"), Hostname, log_data);
-    portUDP.write(str);
+    snprintf_P(syslog_preamble, sizeof(syslog_preamble), PSTR("%s ESP-"), Hostname);
+    memmove(log_data + strlen(syslog_preamble), log_data, sizeof(log_data) - strlen(syslog_preamble));
+    log_data[sizeof(log_data) -1] = '\0';
+    memcpy(log_data, syslog_preamble, strlen(syslog_preamble));
+    portUDP.write(log_data);
     portUDP.endPacket();
   } else {
     syslog_level = 0;
@@ -1166,7 +1170,9 @@ void addLog(byte loglevel)
 
   snprintf_P(mxtime, sizeof(mxtime), PSTR("%02d" D_HOUR_MINUTE_SEPARATOR "%02d" D_MINUTE_SECOND_SEPARATOR "%02d"), rtcTime.Hour, rtcTime.Minute, rtcTime.Second);
 
-  if (loglevel <= seriallog_level) Serial.printf("%s %s\n", mxtime, log_data);
+  if (loglevel <= seriallog_level) {
+    Serial.printf("%s %s\n", mxtime, log_data);
+  }
 #ifdef USE_WEBSERVER
   if (sysCfg.webserver && (loglevel <= sysCfg.weblog_level)) {
     Log[logidx] = String(mxtime) + " " + String(log_data);
@@ -1189,11 +1195,11 @@ void addLog_P(byte loglevel, const char *formatP)
 
 void addLog_P(byte loglevel, const char *formatP, const char *formatP2)
 {
-  char mes2[100];
+  char message[100];
 
   snprintf_P(log_data, sizeof(log_data), formatP);
-  snprintf_P(mes2, sizeof(mes2), formatP2);
-  strncat(log_data, mes2, sizeof(log_data));
+  snprintf_P(message, sizeof(message), formatP2);
+  strncat(log_data, message, sizeof(log_data));
   addLog(loglevel);
 }
 
diff --git a/sonoff/webserver.ino b/sonoff/webserver.ino
index b3dc29c6d..1873cd6bc 100644
--- a/sonoff/webserver.ino
+++ b/sonoff/webserver.ino
@@ -429,7 +429,8 @@ void handleRoot()
   if (HTTP_MANAGER == _httpflag) {
     handleWifi0();
   } else {
-    char stemp[10], line[160];
+    char stemp[10];
+    char line[160];
     String page = FPSTR(HTTP_HEAD);
     page.replace(F("{v}"), FPSTR(S_MAIN_MENU));
     page.replace(F("<body>"), F("<body onload='la()'>"));
@@ -1085,7 +1086,7 @@ void handleReset()
     return;
   }
 
-  char svalue[16];  // was MESSZ
+  char svalue[16];
 
   addLog_P(LOG_LEVEL_DEBUG, S_LOG_HTTP, S_RESET_CONFIGURATION);
 
@@ -1144,7 +1145,7 @@ void handleUpgradeStart()
   if (httpUser()) {
     return;
   }
-  char svalue[100];  // was MESSZ
+  char svalue[100];
 
   addLog_P(LOG_LEVEL_DEBUG, PSTR(D_LOG_HTTP D_UPGRADE_STARTED));
   WIFI_configCounter();
diff --git a/sonoff/xdrv_snfsc.ino b/sonoff/xdrv_snfsc.ino
index a89d05e0c..c6ed4c767 100644
--- a/sonoff/xdrv_snfsc.ino
+++ b/sonoff/xdrv_snfsc.ino
@@ -55,11 +55,19 @@
 
 uint16_t sc_value[5] = { 0 };
 
+void sc_send(const char *data)
+{
+  Serial.write(data);
+  Serial.write('\x1B');
+  snprintf_P(log_data, sizeof(log_data), PSTR(D_LOG_SERIAL D_TRANSMIT " %s"), data);
+  addLog(LOG_LEVEL_DEBUG);
+}
+
 void sc_init()
 {
-//  Serial.write("AT+DEVCONFIG=\"uploadFreq\":1800\e");
-  Serial.write("AT+START\e");
-//  Serial.write("AT+STATUS\e");
+//  sc_send("AT+DEVCONFIG=\"uploadFreq\":1800");
+  sc_send("AT+START");
+//  sc_send("AT+STATUS");
 }
 
 void sc_rcvstat(char *rcvstat)
@@ -68,7 +76,10 @@ void sc_rcvstat(char *rcvstat)
   char *str;
   uint16_t value[5] = { 0 };
 
-  if (!strncmp(rcvstat, "AT+UPDATE=", 10)) {
+  snprintf_P(log_data, sizeof(log_data), PSTR(D_LOG_SERIAL D_RECEIVED " %s"), rcvstat);
+  addLog(LOG_LEVEL_DEBUG);
+
+  if (!strncasecmp_P(rcvstat, PSTR("AT+UPDATE="), 10)) {
     int8_t i = -1;
     for (str = strtok_r(rcvstat, ":", &p); str && i < 5; str = strtok_r(NULL, ":", &p)) {
       value[i++] = atoi(str);
@@ -80,13 +91,13 @@ void sc_rcvstat(char *rcvstat)
       sc_value[2] = (11 - sc_value[2]) * 10;  // Invert light level
       sc_value[3] *= 10;
       sc_value[4] = (11 - sc_value[4]) * 10;  // Invert dust level
-      Serial.write("AT+SEND=ok\e");
+      sc_send("AT+SEND=ok");
     } else {
-      Serial.write("AT+SEND=fail\e");
+      sc_send("AT+SEND=fail");
     }
   }
-  else if (!strcmp_P(rcvstat,PSTR("AT+STATUS?"))) {
-    Serial.write("AT+STATUS=4\e");
+  else if (!strcasecmp_P(rcvstat, PSTR("AT+STATUS?"))) {
+    sc_send("AT+STATUS=4");
   }
 }
 
@@ -94,11 +105,6 @@ void sc_rcvstat(char *rcvstat)
  * Presentation
 \*********************************************************************************************/
 
-float sc_convertCtoF(float c)
-{
-  return c * 1.8 + 32;
-}
-
 void sc_mqttPresent(uint8_t* djson)
 {
   if (sc_value[0] > 0) {