diff --git a/sonoff/_changelog.ino b/sonoff/_changelog.ino
index 27b47a02f..2d77e925f 100644
--- a/sonoff/_changelog.ino
+++ b/sonoff/_changelog.ino
@@ -1,7 +1,9 @@
 /* 6.4.1.9 20190115
  * Add support for Mi LED Desk Lamp with rotary switch (#4887)
- * Fix mDNS addService (#4938)
+ * Fix mDNS addService (#4938, #4951)
  * Fix allowable MAX_RULE_VARS to 16 (#4933)
+ * Add (S)SerialSend3 escape sequence \x to allow hexadecimal byte value (#3560, #4947)
+ * Add SerialBridge command SSerialSend5 <hexdata>
  *
  * 6.4.1.8 20190107
  * Change sonoff_template.h layout regarding optional module flags like ADC0
diff --git a/sonoff/sonoff.ino b/sonoff/sonoff.ino
index f16a3ba10..a4fe3bf38 100755
--- a/sonoff/sonoff.ino
+++ b/sonoff/sonoff.ino
@@ -1051,7 +1051,7 @@ void MqttDataHandler(char* topic, byte* data, unsigned int data_len)
           Serial.printf("%s", Unescape(dataBuf, &dat_len));  // "Hello\f"
         }
         else if (5 == index) {
-          SerialSendRaw(RemoveSpace(dataBuf));  // "AA004566"
+          SerialSendRaw(RemoveSpace(dataBuf));               // "AA004566" as hex values
         }
         snprintf_P(mqtt_data, sizeof(mqtt_data), S_JSON_COMMAND_SVALUE, command, D_JSON_DONE);
       }
@@ -1427,7 +1427,7 @@ void ExecuteCommandPower(byte device, byte state, int source)
       interlock_mutex = 0;
     }
   }
-    if ( Settings.flag.interlock && !interlock_mutex && !Settings.flag3.split_interlock) {  //execute regular interlock-mode as interlock-split is off    
+    if ( Settings.flag.interlock && !interlock_mutex && !Settings.flag3.split_interlock) {  //execute regular interlock-mode as interlock-split is off
       interlock_mutex = 1;
       for (byte i = 0; i < devices_present; i++) {
         power_t imask = 1 << i;
diff --git a/sonoff/support.ino b/sonoff/support.ino
index 55be05df7..148ae8783 100644
--- a/sonoff/support.ino
+++ b/sonoff/support.ino
@@ -210,10 +210,12 @@ char* Unescape(char* buffer, uint16_t* size)
 {
   uint8_t* read = (uint8_t*)buffer;
   uint8_t* write = (uint8_t*)buffer;
-  uint16_t start_size = *size;
-  uint16_t end_size = *size;
+  int16_t start_size = *size;
+  int16_t end_size = *size;
   uint8_t che = 0;
 
+//  AddLogBuffer(LOG_LEVEL_DEBUG, (uint8_t*)buffer, *size);
+
   while (start_size > 0) {
     uint8_t ch = *read++;
     start_size--;
@@ -235,6 +237,14 @@ char* Unescape(char* buffer, uint16_t* size)
           case 's': che = ' ';  break;   // 20 Space
           case 't': che = '\t'; break;   // 09 Horizontal tab
           case 'v': che = '\v'; break;   // 0B Vertical tab
+          case 'x': {
+            uint8_t* start = read;
+            che = (uint8_t)strtol((const char*)read, (char**)&read, 16);
+            start_size -= (uint16_t)(read - start);
+            end_size -= (uint16_t)(read - start);
+            break;
+          }
+          case '"': che = '\"'; break;   // 22 Quotation mark
 //          case '?': che = '\?'; break;   // 3F Question mark
           default : {
             che = chi;
@@ -247,6 +257,9 @@ char* Unescape(char* buffer, uint16_t* size)
     }
   }
   *size = end_size;
+
+//  AddLogBuffer(LOG_LEVEL_DEBUG, (uint8_t*)buffer, *size);
+
   return buffer;
 }
 
@@ -511,7 +524,7 @@ void ModuleGpios(myio *gp)
   memcpy_P(&src, &kModules[Settings.module].gp, sizeof(mycfgio));
   // 11 85 00 85 85 00 00 00 15 38 85 00 00 81
 
-//  AddLogSerial(LOG_LEVEL_DEBUG, (uint8_t *)&src, sizeof(mycfgio));
+//  AddLogBuffer(LOG_LEVEL_DEBUG, (uint8_t *)&src, sizeof(mycfgio));
 
   for (uint8_t i = 0; i < sizeof(mycfgio); i++) {
     if (i < 6) {
@@ -526,7 +539,7 @@ void ModuleGpios(myio *gp)
   }
   // 11 85 00 85 85 00 00 00 00 00 00 00 15 38 85 00 00 81
 
-//  AddLogSerial(LOG_LEVEL_DEBUG, (uint8_t *)gp, sizeof(myio));
+//  AddLogBuffer(LOG_LEVEL_DEBUG, (uint8_t *)gp, sizeof(myio));
 }
 
 gpio_flag ModuleFlag()
@@ -1197,9 +1210,9 @@ void AddLog_P(byte loglevel, const char *formatP, const char *formatP2)
   AddLog(loglevel);
 }
 
-void AddLogSerial(byte loglevel, uint8_t *buffer, int count)
+void AddLogBuffer(byte loglevel, uint8_t *buffer, int count)
 {
-  snprintf_P(log_data, sizeof(log_data), PSTR(D_LOG_SERIAL D_RECEIVED));
+  snprintf_P(log_data, sizeof(log_data), PSTR("DMP:"));
   for (int i = 0; i < count; i++) {
     snprintf_P(log_data, sizeof(log_data), PSTR("%s %02X"), log_data, *(buffer++));
   }
@@ -1208,7 +1221,7 @@ void AddLogSerial(byte loglevel, uint8_t *buffer, int count)
 
 void AddLogSerial(byte loglevel)
 {
-  AddLogSerial(loglevel, (uint8_t*)serial_in_buffer, serial_in_byte_counter);
+  AddLogBuffer(loglevel, (uint8_t*)serial_in_buffer, serial_in_byte_counter);
 }
 
 void AddLogMissed(char *sensor, uint8_t misses)
diff --git a/sonoff/xdrv_08_serial_bridge.ino b/sonoff/xdrv_08_serial_bridge.ino
index 08a4f7211..80ec37178 100644
--- a/sonoff/xdrv_08_serial_bridge.ino
+++ b/sonoff/xdrv_08_serial_bridge.ino
@@ -99,18 +99,34 @@ boolean SerialBridgeCommand(void)
   if (-1 == command_code) {
     serviced = false;  // Unknown command
   }
-  else if ((CMND_SSERIALSEND == command_code) && (XdrvMailbox.index > 0) && (XdrvMailbox.index <= 3)) {
-    if (XdrvMailbox.data_len > 0) {
+  else if ((CMND_SSERIALSEND == command_code) && (XdrvMailbox.index > 0) && (XdrvMailbox.index <= 5)) {
+    if (XdrvMailbox.data_len > 0) {       // "Hello Tiger\n"
       if (1 == XdrvMailbox.index) {
         SerialBridgeSerial->write(XdrvMailbox.data, XdrvMailbox.data_len);
         SerialBridgeSerial->write("\n");
       }
-      else if (2 == XdrvMailbox.index) {
+      else if ((2 == XdrvMailbox.index) || (4 == XdrvMailbox.index)) {  // "Hello Tiger" or "A0"
         SerialBridgeSerial->write(XdrvMailbox.data, XdrvMailbox.data_len);
       }
-      else if (3 == XdrvMailbox.index) {
+      else if (3 == XdrvMailbox.index) {  // "Hello\f"
         SerialBridgeSerial->write(Unescape(XdrvMailbox.data, &XdrvMailbox.data_len), XdrvMailbox.data_len);
       }
+      else if (5 == XdrvMailbox.index) {  // "AA004566" as hex values
+        char *p;
+        char stemp[3];
+        uint8_t code;
+
+        char *codes = RemoveSpace(XdrvMailbox.data);
+        int size = strlen(XdrvMailbox.data);
+
+        while (size > 0) {
+          snprintf(stemp, sizeof(stemp), codes);
+          code = strtol(stemp, &p, 16);
+          SerialBridgeSerial->write(code);
+          size -= 2;
+          codes += 2;
+        }
+      }
       snprintf_P(mqtt_data, sizeof(mqtt_data), S_JSON_COMMAND_SVALUE, command, D_JSON_DONE);
     }
   }
diff --git a/sonoff/xnrg_03_pzem004t.ino b/sonoff/xnrg_03_pzem004t.ino
index 846c14431..34bff43fe 100644
--- a/sonoff/xnrg_03_pzem004t.ino
+++ b/sonoff/xnrg_03_pzem004t.ino
@@ -122,7 +122,7 @@ bool PzemRecieve(uint8_t resp, float *data)
     }
   }
 
-  AddLogSerial(LOG_LEVEL_DEBUG_MORE, buffer, len);
+  AddLogBuffer(LOG_LEVEL_DEBUG_MORE, buffer, len);
 
   if (len != sizeof(PZEMCommand)) {
 //    AddLog_P(LOG_LEVEL_DEBUG, PSTR(D_LOG_DEBUG "Pzem comms timeout"));
diff --git a/sonoff/xnrg_04_mcp39f501.ino b/sonoff/xnrg_04_mcp39f501.ino
index 0301bf040..1ff04fb7d 100644
--- a/sonoff/xnrg_04_mcp39f501.ino
+++ b/sonoff/xnrg_04_mcp39f501.ino
@@ -143,7 +143,7 @@ void McpSend(uint8_t *data)
   data[0] = MCP_START_FRAME;
   data[data[1] -1] = McpChecksum(data);
 
-//  AddLogSerial(LOG_LEVEL_DEBUG_MORE, data, data[1]);
+//  AddLogBuffer(LOG_LEVEL_DEBUG_MORE, data, data[1]);
 
   for (byte i = 0; i < data[1]; i++) {
     Serial.write(data[i]);
diff --git a/sonoff/xnrg_05_pzem_ac.ino b/sonoff/xnrg_05_pzem_ac.ino
index a171b4079..f01ebad3e 100644
--- a/sonoff/xnrg_05_pzem_ac.ino
+++ b/sonoff/xnrg_05_pzem_ac.ino
@@ -46,7 +46,7 @@ void PzemAcEverySecond(void)
     uint8_t buffer[26];
 
     uint8_t error = PzemAcModbus->ReceiveBuffer(buffer, 10);
-    AddLogSerial(LOG_LEVEL_DEBUG_MORE, buffer, (buffer[2]) ? buffer[2] +5 : sizeof(buffer));
+    AddLogBuffer(LOG_LEVEL_DEBUG_MORE, buffer, (buffer[2]) ? buffer[2] +5 : sizeof(buffer));
 
     if (error) {
       snprintf_P(log_data, sizeof(log_data), PSTR(D_LOG_DEBUG "PzemAc response error %d"), error);
diff --git a/sonoff/xnrg_06_pzem_dc.ino b/sonoff/xnrg_06_pzem_dc.ino
index 2adda5092..536cb4b97 100644
--- a/sonoff/xnrg_06_pzem_dc.ino
+++ b/sonoff/xnrg_06_pzem_dc.ino
@@ -46,7 +46,7 @@ void PzemDcEverySecond(void)
     uint8_t buffer[22];
 
     uint8_t error = PzemDcModbus->ReceiveBuffer(buffer, 8);
-    AddLogSerial(LOG_LEVEL_DEBUG_MORE, buffer, (buffer[2]) ? buffer[2] +5 : sizeof(buffer));
+    AddLogBuffer(LOG_LEVEL_DEBUG_MORE, buffer, (buffer[2]) ? buffer[2] +5 : sizeof(buffer));
 
     if (error) {
       snprintf_P(log_data, sizeof(log_data), PSTR(D_LOG_DEBUG "PzemDc response error %d"), error);
diff --git a/sonoff/xsns_15_mhz19.ino b/sonoff/xsns_15_mhz19.ino
index d04d5a0c5..bc8e46ada 100644
--- a/sonoff/xsns_15_mhz19.ino
+++ b/sonoff/xsns_15_mhz19.ino
@@ -198,7 +198,7 @@ void MhzEverySecond(void)
       }
     }
 
-    AddLogSerial(LOG_LEVEL_DEBUG_MORE, mhz_response, counter);
+    AddLogBuffer(LOG_LEVEL_DEBUG_MORE, mhz_response, counter);
 
     if (counter < 9) {
 //      AddLog_P(LOG_LEVEL_DEBUG, PSTR(D_LOG_DEBUG "MH-Z19 comms timeout"));
diff --git a/sonoff/xsns_18_pms5003.ino b/sonoff/xsns_18_pms5003.ino
index 50ad9f7af..1f048134a 100644
--- a/sonoff/xsns_18_pms5003.ino
+++ b/sonoff/xsns_18_pms5003.ino
@@ -62,7 +62,7 @@ boolean PmsReadData(void)
   PmsSerial->readBytes(buffer, 32);
   PmsSerial->flush();  // Make room for another burst
 
-  AddLogSerial(LOG_LEVEL_DEBUG_MORE, buffer, 32);
+  AddLogBuffer(LOG_LEVEL_DEBUG_MORE, buffer, 32);
 
   // get checksum ready
   for (uint8_t i = 0; i < 30; i++) {
diff --git a/sonoff/xsns_20_novasds.ino b/sonoff/xsns_20_novasds.ino
index e3e1e48e9..1f94dea6a 100644
--- a/sonoff/xsns_20_novasds.ino
+++ b/sonoff/xsns_20_novasds.ino
@@ -108,7 +108,7 @@ bool NovaSdsCommand(uint8_t byte1, uint8_t byte2, uint8_t byte3, uint16_t sensor
 
   // read rest (9 of 10 bytes) of message
   NovaSdsSerial->readBytes(&recbuf[1], 9);
-  AddLogSerial(LOG_LEVEL_DEBUG_MORE, recbuf, sizeof(recbuf));
+  AddLogBuffer(LOG_LEVEL_DEBUG_MORE, recbuf, sizeof(recbuf));
 
   if ( NULL != buffer ) {
     // return data to buffer
diff --git a/sonoff/xsns_38_az7798.ino b/sonoff/xsns_38_az7798.ino
index d53b657c7..433b380b0 100644
--- a/sonoff/xsns_38_az7798.ino
+++ b/sonoff/xsns_38_az7798.ino
@@ -158,7 +158,7 @@ void AzEverySecond(void)
       }
     } while(((millis() - start) < AZ_READ_TIMEOUT) && (counter < sizeof(az_response)) && !az_received);
 
-    AddLogSerial(LOG_LEVEL_DEBUG_MORE, az_response, counter);
+    AddLogBuffer(LOG_LEVEL_DEBUG_MORE, az_response, counter);
 
     if (!az_received) {
       AddLog_P(LOG_LEVEL_DEBUG, PSTR(D_LOG_DEBUG "AZ7798 comms timeout"));