diff --git a/README.md b/README.md
index cf7cd0c8b..18f93efe4 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 **3.9.16** - See ```sonoff/_releasenotes.ino``` for change information.
+Current version is **3.9.17** - See ```sonoff/_releasenotes.ino``` for change information.
 
 - This version provides all (Sonoff) modules in one file and starts up with Sonoff Basic.
 - Once uploaded select module using the configuration webpage or the commands ```Modules``` and ```Module```.
diff --git a/api/arduino/sonoff.ino.bin b/api/arduino/sonoff.ino.bin
index 70b1540e6..415809a70 100644
Binary files a/api/arduino/sonoff.ino.bin and b/api/arduino/sonoff.ino.bin differ
diff --git a/sonoff/_releasenotes.ino b/sonoff/_releasenotes.ino
index a98a944c3..e5288d83c 100644
--- a/sonoff/_releasenotes.ino
+++ b/sonoff/_releasenotes.ino
@@ -1,4 +1,9 @@
-/* 3.9.16 20170214
+/* 3.9.17 20170217
+ * Fix possible ArduinoJSON related memory fragmentation
+ * Changed console logging using less memory
+ * Add GPIO04 as user selectable for Sonoff Dual (#75)
+ *
+ * 3.9.16 20170214
  * Update latching relay handler
  * Add support for IR led using IRremoteESP8266 library (#59)
  * Add Hue argument passing using ArduinoJSON library (#59)
diff --git a/sonoff/sonoff.ino b/sonoff/sonoff.ino
index d389ee5c2..53509c819 100644
--- a/sonoff/sonoff.ino
+++ b/sonoff/sonoff.ino
@@ -10,7 +10,7 @@
  * ====================================================
 */
 
-#define VERSION                0x03091000   // 3.9.16
+#define VERSION                0x03091100   // 3.9.17
 
 //#define BE_MINIMAL                          // Compile a minimal version if upgrade memory gets tight (still 404k)
                                             // To be used as step 1. Next step is compile and use desired version
@@ -127,7 +127,7 @@ enum emul_t  {EMUL_NONE, EMUL_WEMO, EMUL_HUE, EMUL_MAX};
 #ifdef USE_MQTT_TLS
   #define MAX_LOG_LINES        10           // Max number of lines in weblog
 #else
-  #define MAX_LOG_LINES        60           // Max number of lines in weblog
+  #define MAX_LOG_LINES        20           // Max number of lines in weblog
 #endif
 
 #define APP_BAUDRATE           115200       // Default serial baudrate
@@ -141,6 +141,7 @@ enum butt_t {PRESSED, NOT_PRESSED};
 #include <ESP8266HTTPClient.h>              // MQTT, Ota
 #include <ESP8266httpUpdate.h>              // Ota
 #include <PubSubClient.h>                   // MQTT
+#include <ArduinoJson.h>                    // WemoHue, IRremote, Domoticz
 #ifdef USE_WEBSERVER
   #include <ESP8266WebServer.h>             // WifiManager, Webserver
   #include <DNSServer.h>                    // WifiManager
@@ -154,12 +155,6 @@ enum butt_t {PRESSED, NOT_PRESSED};
 #ifdef USE_I2C
   #include <Wire.h>                         // I2C support library
 #endif  // USE_I2C
-#if defined USE_EMULATION || defined USE_IR_REMOTE
-  #include <ArduinoJson.h>
-
-  const size_t bufferSize = JSON_ARRAY_SIZE(2) + JSON_OBJECT_SIZE(10) + 130;  // Required size for complete HUE light JSON object or other JSON objects
-  DynamicJsonBuffer jsonBuffer(bufferSize);
-#endif // USE_EMULATION || USE_IR_REMOTE
 
 typedef void (*rtcCallback)();
 
@@ -900,6 +895,7 @@ void sl_setColor(byte type)
   }
 }
 
+
 void json2legacy(char* stopic, char* svalue)
 {
   char *p, *token;
@@ -2458,7 +2454,7 @@ void GPIO_init()
   uint8_t mpin;
   mytmplt def_module;
 
-  if (!sysCfg.module || (sysCfg.module >= MAXMODULE)) sysCfg.module = SONOFF_BASIC;  // Sonoff Basic
+  if (!sysCfg.module || (sysCfg.module >= MAXMODULE)) sysCfg.module = MODULE;
 
   memcpy_P(&def_module, &modules[sysCfg.module], sizeof(def_module));
   strlcpy(my_module.name, def_module.name, sizeof(my_module.name));
diff --git a/sonoff/sonoff_template.h b/sonoff/sonoff_template.h
index 492e64218..34b9bac74 100644
--- a/sonoff/sonoff_template.h
+++ b/sonoff/sonoff_template.h
@@ -155,7 +155,8 @@ const mytmplt modules[MAXMODULE] PROGMEM = {
      GPIO_TXD,         // GPIO01 Relay control
      0,
      GPIO_RXD,         // GPIO03 Relay control
-     0, 0, 0, 0, 0, 0, 0, 0, 0,
+     GPIO_USER,        // GPIO04 Optional sensor
+     0, 0, 0, 0, 0, 0, 0, 0,
      GPIO_LED1_INV,    // GPIO13 Blue Led (0 = On, 1 = Off)
      0, 0, 0
   },
diff --git a/sonoff/webserver.ino b/sonoff/webserver.ino
index 247be80ff..80679698e 100644
--- a/sonoff/webserver.ino
+++ b/sonoff/webserver.ino
@@ -60,8 +60,19 @@ const char HTTP_HEAD[] PROGMEM =
       "var x=new XMLHttpRequest();"
       "x.onreadystatechange=function(){"
         "if(x.readyState==4&&x.status==200){"
-          "e.value=x.responseText;"
-          "e.scrollTop=100000;"
+          "var s1=x.responseText;"
+          "if(e.value.length==0){"
+            "e.value=s1;"
+          "}else{"
+            "var s2=e.value.slice(e.value.lastIndexOf(\"\\n\")+2);"
+            "var p2=s1.search(s2);"
+            "if(p2>-1){"
+              "e.value=e.value.replace(s2,s1.slice(p2));"
+            "}else{"
+              "e.value=e.value+\"\\n\"+s1;"
+            "}"
+          "}"
+          "e.scrollTop=99999;"
           "sn=e.scrollTop;"
         "}"
       "};"
@@ -75,7 +86,7 @@ const char HTTP_HEAD[] PROGMEM =
   "div,fieldset,input,select{padding:5px;font-size:1em;}"
   "input{width:95%;}"
   "select{width:100%;}"
-  "textarea{resize:none;width:98%;height:312px;padding:5px;overflow:auto;}"
+  "textarea{resize:none;width:98%;height:318px;padding:5px;overflow:auto;}"
   "body{text-align:center;font-family:verdana;}"
   "td{padding:0px;}"
   "button{border:0;border-radius:0.3rem;background-color:#1fa3ec;color:#fff;line-height:2.4rem;font-size:1.2rem;width:100%;-webkit-transition-duration:0.4s;transition-duration:0.4s;}"
@@ -197,9 +208,9 @@ const char HTTP_FORM_UPG[] PROGMEM =
   "</div>"
   "<div id='f2' name='f2' style='display:none;text-align:center;'><b>Upload started ...</b></div>";
 const char HTTP_FORM_CMND[] PROGMEM =
-  "<br/><textarea readonly id='t1' name='t1' cols='80' wrap='off'></textarea><br/><br/>"
+  "<br/><textarea readonly id='t1' name='t1' cols='99' wrap='off'></textarea><br/><br/>"
   "<form method='post' action='cs'>"
-  "<input style='width:98%' id='c1' name='c1' length=80 placeholder='Enter command' autofocus><br/>"
+  "<input style='width:98%' id='c1' name='c1' length='99' placeholder='Enter command' autofocus><br/>"
 //  "<br/><button type='submit'>Send command</button>"
   "</form>";
 const char HTTP_COUNTER[] PROGMEM =
@@ -427,7 +438,7 @@ void pollDnsWeb()
 void showPage(String &page)
 {
   page.replace("{ha}", my_module.name);
-  page.replace("{h}", String(sysCfg.friendlyname[0]));
+  page.replace("{h}", sysCfg.friendlyname[0]);
   if (_httpflag == HTTP_MANAGER) {
     if (WIFI_configCounter()) {
       page.replace("<body>", "<body onload='u()'>");
@@ -681,11 +692,11 @@ void handleWifi(boolean scan)
   }
 
   page += FPSTR(HTTP_FORM_WIFI);
-  page.replace("{h1}", String(sysCfg.hostname));
-  page.replace("{s1}", String(sysCfg.sta_ssid[0]));
-  page.replace("{p1}", String(sysCfg.sta_pwd[0]));
-  page.replace("{s2}", String(sysCfg.sta_ssid[1]));
-  page.replace("{p2}", String(sysCfg.sta_pwd[1]));
+  page.replace("{h1}", sysCfg.hostname);
+  page.replace("{s1}", sysCfg.sta_ssid[0]);
+  page.replace("{p1}", sysCfg.sta_pwd[0]);
+  page.replace("{s2}", sysCfg.sta_ssid[1]);
+  page.replace("{p2}", sysCfg.sta_pwd[1]);
   page += FPSTR(HTTP_FORM_END);
   if (_httpflag == HTTP_MANAGER) {
     page += FPSTR(HTTP_BTN_RSTRT);
@@ -706,12 +717,12 @@ void handleMqtt()
   char str[sizeof(sysCfg.mqtt_client)];
   getClient(str, MQTT_CLIENT_ID, sizeof(sysCfg.mqtt_client));
   page.replace("{m0}", str);
-  page.replace("{m1}", String(sysCfg.mqtt_host));
+  page.replace("{m1}", sysCfg.mqtt_host);
   page.replace("{m2}", String(sysCfg.mqtt_port));
-  page.replace("{m3}", String(sysCfg.mqtt_client));
-  page.replace("{m4}", String(sysCfg.mqtt_user));
-  page.replace("{m5}", String(sysCfg.mqtt_pwd));
-  page.replace("{m6}", String(sysCfg.mqtt_topic));
+  page.replace("{m3}", sysCfg.mqtt_client);
+  page.replace("{m4}", sysCfg.mqtt_user);
+  page.replace("{m5}", sysCfg.mqtt_pwd);
+  page.replace("{m6}", sysCfg.mqtt_topic);
   page += FPSTR(HTTP_FORM_END);
   page += FPSTR(HTTP_BTN_CONF);
   showPage(page);
@@ -755,7 +766,7 @@ void handleLog()
     }
   }
   page += FPSTR(HTTP_FORM_LOG3);
-  page.replace("{l2}", String(sysCfg.syslog_host));
+  page.replace("{l2}", sysCfg.syslog_host);
   page.replace("{l3}", String(sysCfg.syslog_port));
   page.replace("{l4}", String(sysCfg.tele_period));
   page += FPSTR(HTTP_FORM_END);
@@ -776,7 +787,7 @@ void handleOther()
   page += FPSTR(HTTP_FORM_OTHER2);
   page.replace("{1", "1");
   page.replace("{2", FRIENDLY_NAME);
-  page.replace("{3", String(sysCfg.friendlyname[0]));
+  page.replace("{3", sysCfg.friendlyname[0]);
 #ifdef USE_EMULATION
   page += FPSTR(HTTP_FORM_OTHER3);
   page.replace("{r2}", (sysCfg.emulation == EMUL_NONE) ? " checked" : "");
@@ -787,7 +798,7 @@ void handleOther()
     page.replace("{1", String(i +1));
     snprintf_P(stemp, sizeof(stemp), PSTR(FRIENDLY_NAME"%d"), i +1);
     page.replace("{2", stemp);
-    page.replace("{3", String(sysCfg.friendlyname[i]));
+    page.replace("{3", sysCfg.friendlyname[i]);
   }
   page += F("<br/></fieldset>");
 #endif  // USE_EMULATION
@@ -966,7 +977,7 @@ void handleUpgrade()
   String page = FPSTR(HTTP_HEAD);
   page.replace("{v}", "Firmware upgrade");
   page += FPSTR(HTTP_FORM_UPG);
-  page.replace("{o1}", String(sysCfg.otaUrl));
+  page.replace("{o1}", sysCfg.otaUrl);
   page += FPSTR(HTTP_BTN_MAIN);
   showPage(page);
 
@@ -1269,7 +1280,7 @@ void handleInfo()
   for (byte i = 0; i < Maxdevice; i++) {
     page += F("<tr><th>Friendly name ");
     page += i +1;
-    page += F("</th><td>"); page += String(sysCfg.friendlyname[i]); page += F("</td></tr>");
+    page += F("</th><td>"); page += sysCfg.friendlyname[i]; page += F("</td></tr>");
   }
   page += F("<tr><td>&nbsp;</td></tr>");
 //  page += F("<tr><th>SSId (RSSI)</th><td>"); page += (sysCfg.sta_active)? sysCfg.sta_ssid2 : sysCfg.sta_ssid1; page += F(" ("); page += WIFI_getRSSIasQuality(WiFi.RSSI()); page += F("%)</td></tr>");
@@ -1387,7 +1398,7 @@ void handleUPnPsetupWemo()
   addLog_P(LOG_LEVEL_DEBUG, PSTR("HTTP: Handle WeMo setup"));
 
   String setup_xml = FPSTR(WEMO_SETUP_XML);
-  setup_xml.replace("{x1}", String(sysCfg.friendlyname[0]));
+  setup_xml.replace("{x1}", sysCfg.friendlyname[0]);
   setup_xml.replace("{x2}", wemo_UUID());
   setup_xml.replace("{x3}", wemo_serial());
   webServer->send(200, "text/xml", setup_xml);
@@ -1432,7 +1443,7 @@ void hue_config_response(String *response)
   response->replace("{gw}", WiFi.gatewayIP().toString());
   snprintf_P(buffer, sizeof(buffer), PSTR("%04d-%02d-%02dT%02d:%02d:%02d"),
     rtcTime.Year, rtcTime.Month, rtcTime.Day, rtcTime.Hour, rtcTime.Minute, rtcTime.Second);
-  response->replace("{dt}", String(buffer));
+  response->replace("{dt}", buffer);
 }
 
 void hue_global_cfg(String *path)
@@ -1471,13 +1482,9 @@ void hue_global_cfg(String *path)
 
 void hue_auth(String *path)
 {
-  String response;
-  char uid[7];
+  char response[38];
   
-  snprintf_P(uid, sizeof(uid), PSTR("%03x"), ESP.getChipId());
-  response="[{\"success\":{\"username\":\"";
-  response+=String(uid);
-  response+="\"}}]";
+  snprintf_P(response, sizeof(response), PSTR("[{\"success\":{\"username\":\"%03x\"}}]"), ESP.getChipId());
   webServer->send(200, "application/json", response);
 }
 
@@ -1493,6 +1500,9 @@ void hue_config(String *path)
 
 void hue_lights(String *path)
 {
+/*
+ * http://sonoff/api/username/lights/1/state?1={"on":true,"hue":56100,"sat":254,"bri":254,"alert":"none","transitiontime":40}
+ */
   String response;
   uint8_t device = 1;
   int16_t pos = 0;
@@ -1530,7 +1540,7 @@ void hue_lights(String *path)
   else if (path->endsWith("/state"))                         // Got ID/state
   {
     path->remove(0,8);                                       // Remove /lights/
-    path->remove(path->indexOf("/state"));                    // Remove /state
+    path->remove(path->indexOf("/state"));                   // Remove /state
     device = atoi(path->c_str());
     if ((device < 1) || (device > Maxdevice)) device = 1;
     response = "[";
@@ -1540,6 +1550,7 @@ void hue_lights(String *path)
     response.replace("{cmd}", "state/on");
     if (webServer->args() == 1) 
     {
+      StaticJsonBuffer<400> jsonBuffer;
       JsonObject &hue_json = jsonBuffer.parseObject(webServer->arg(0));
       on = hue_json["on"];
       switch(on)
diff --git a/sonoff/xdrv_domoticz.ino b/sonoff/xdrv_domoticz.ino
index 48835bf8f..378d0bfbc 100644
--- a/sonoff/xdrv_domoticz.ino
+++ b/sonoff/xdrv_domoticz.ino
@@ -40,36 +40,6 @@ const char domoticz_sensors[DOMOTICZ_MAX_SENSORS][14] PROGMEM =
 int domoticz_update_timer = 0;
 byte domoticz_update_flag = 1;
 
-unsigned long getKeyIntValue(const char *json, const char *key)
-{
-  char *p, *b;
-  int i;
-
-  // search key
-  p = strstr(json, key);
-  if (!p) return 0;
-  // search following separator :
-  b = strchr(p + strlen(key), ':');
-  if (!b) return 0;
-  // Only the following chars are allowed between key and separator :
-  for(i = b - json + strlen(key); i < p-json; i++) {
-    switch (json[i]) {
-    case ' ':
-    case '\n':
-    case '\t':
-    case '\r':
-      continue;
-    default:
-      return 0;
-    }
-  }
-  b++;
-  // Allow integers as string too (used in "svalue" : "9")
-  while ((b[0] == ' ') || (b[0] == '"')) b++;
-  // Convert to integer
-  return atoi(b);
-}
-
 void mqtt_publishDomoticzPowerState(byte device)
 {
   char svalue[MESSZ];
@@ -130,6 +100,23 @@ boolean domoticz_update()
   return domoticz_update_flag;
 }
 
+/*
+ * ArduinoJSON Domoticz Switch entry used to calculate jsonBuf: JSON_OBJECT_SIZE(11) + 129 = 313
+{
+   "Battery" : 255,
+   "RSSI" : 12,
+   "dtype" : "Light/Switch",
+   "id" : "000140E7",
+   "idx" : 159,
+   "name" : "Sonoff1",
+   "nvalue" : 1,
+   "stype" : "Switch",
+   "svalue1" : "0",
+   "switchType" : "Dimmer",
+   "unit" : 1
+}
+*/
+
 boolean domoticz_mqttData(char *topicBuf, uint16_t stopicBuf, char *dataBuf, uint16_t sdataBuf)
 {
   char log[LOGSZ], stemp1[10];
@@ -139,8 +126,12 @@ boolean domoticz_mqttData(char *topicBuf, uint16_t stopicBuf, char *dataBuf, uin
   domoticz_update_flag = 1;
   if (!strncmp(topicBuf, sysCfg.domoticz_out_topic, strlen(sysCfg.domoticz_out_topic)) != 0) {
     if (sdataBuf < 20) return 1;
-    idx = getKeyIntValue(dataBuf,"\"idx\"");
-    nvalue = getKeyIntValue(dataBuf,"\"nvalue\"");
+    StaticJsonBuffer<400> jsonBuf;
+    JsonObject& domoticz = jsonBuf.parseObject(dataBuf);
+    if (!domoticz.success()) return 1;
+//    if (strcmp(domoticz["dtype"],"Light/Switch")) return 1;
+    idx = domoticz["idx"];
+    nvalue = domoticz["nvalue"];
 
     snprintf_P(log, sizeof(log), PSTR("DMTZ: idx %d, nvalue %d"), idx, nvalue);
     addLog(LOG_LEVEL_DEBUG_MORE, log);
@@ -150,7 +141,7 @@ boolean domoticz_mqttData(char *topicBuf, uint16_t stopicBuf, char *dataBuf, uin
         if ((idx > 0) && (idx == sysCfg.domoticz_relay_idx[i])) {
           snprintf_P(stemp1, sizeof(stemp1), PSTR("%d"), i +1);
           if (nvalue == 2) {
-            nvalue = getKeyIntValue(dataBuf,"\"svalue1\"");
+            nvalue = domoticz["svalue1"];
             if ((pin[GPIO_WS2812] < 99) && (sysCfg.ws_dimmer == nvalue)) return 1;
             if ((sysCfg.module == SONOFF_LED) && (sysCfg.led_dimmer[i] == nvalue)) return 1;
             snprintf_P(topicBuf, stopicBuf, PSTR("%s/%s/DIMMER%s"),
diff --git a/sonoff/xdrv_ir_send.ino b/sonoff/xdrv_ir_send.ino
index 1e3a54f43..3b26c6818 100644
--- a/sonoff/xdrv_ir_send.ino
+++ b/sonoff/xdrv_ir_send.ino
@@ -42,6 +42,11 @@ void ir_send_init(void)
  * Commands
 \*********************************************************************************************/
 
+/*
+ * ArduinoJSON IRsend entry used to calculate jsonBuf: JSON_OBJECT_SIZE(3) + 40 = 96
+ { "protocol": "SAMSUNG", "bits": 32, "data": 551502015 }
+*/
+
 boolean ir_send_command(char *type, uint16_t index, char *dataBuf, uint16_t data_len, int16_t payload, char *svalue, uint16_t ssvalue)
 {
   boolean serviced = true;
@@ -52,7 +57,8 @@ boolean ir_send_command(char *type, uint16_t index, char *dataBuf, uint16_t data
   
   if (!strcmp(type,"IRSEND")) {
 	  if (data_len) {
-			JsonObject &ir_json = jsonBuffer.parseObject(dataBuf);
+      StaticJsonBuffer<128> jsonBuf;
+      JsonObject &ir_json = jsonBuf.parseObject(dataBuf);
       if (!ir_json.success()) {
         snprintf_P(svalue, ssvalue, PSTR("{\"IRSend\":\"Invalid JSON\"}"));  // JSON decode failed 
       } else {