Squashed commit of the following:

commit 810ab68
Author: Ivan Grokhotkov <igrokhotkov@gmail.com>
Date:   Mon Nov 9 01:37:22 2015 +0300

    Fix WiFiClientSecure::connected (#43)

    thanks @whyameye

commit 7384c38
Merge: 46468d4 464d891
Author: Markus <Links2004@users.noreply.github.com>
Date:   Sun Nov 8 23:04:52 2015 +0100

    Merge pull request #985 from Links2004/docu

    add missing exit in php sample

commit 464d891
Author: Markus Sattler <help.markus+git@gmail.com>
Date:   Sun Nov 8 22:48:48 2015 +0100

    add missing exit in php sample

commit 46468d4
Author: Ivan Grokhotkov <igrokhotkov@gmail.com>
Date:   Mon Nov 9 00:18:08 2015 +0300

    I2C: generate STOP in case of NACK (fix #698, #254)

    thanks @petrd and @Yazzcat

commit 4cf72e7
Author: Ivan Grokhotkov <igrokhotkov@gmail.com>
Date:   Sun Nov 8 23:44:25 2015 +0300

    Add libc time functions

    Merging igrr/axtls-8266#1 by @Juppit into the core

commit 11340a5
Author: Ivan Grokhotkov <igrokhotkov@gmail.com>
Date:   Sun Nov 8 15:01:17 2015 +0300

    Fix some typos

Author: wemos

cores/esp8266/Arduino.h

@@ -153,7 +153,7 @@ void ets_intr_unlock();
 // level (0-15), interrupts of the given level and above will be active
 // level 15 will disable ALL interrupts,
 // level 0 will enable ALL interrupts,
-// 
+//
 #define xt_rsil(level) (__extension__({uint32_t state; __asm__ __volatile__("rsil %0," __STRINGIFY(level) : "=a" (state)); state;}))
 #define xt_wsr_ps(state)  __asm__ __volatile__("wsr %0,ps; isync" :: "a" (state) : "memory")
 
@@ -271,6 +271,8 @@ long random(long, long);
 void randomSeed(unsigned long);
 long map(long, long, long, long, long);
 
+extern "C" void configTime(int timezone, int daylightOffset_sec,
+    const char* server1, const char* server2 = nullptr, const char* server3 = nullptr);
 
 #endif
 

cores/esp8266/core_esp8266_si2c.c

@@ -150,9 +150,15 @@ static unsigned char twi_read_byte(bool nack) {
 unsigned char twi_writeTo(unsigned char address, unsigned char * buf, unsigned int len, unsigned char sendStop){
   unsigned int i;
   if(!twi_write_start()) return 4;//line busy
-  if(!twi_write_byte(((address << 1) | 0) & 0xFF)) return 2;//received NACK on transmit of address
-  for(i=0; i<len; i++){
-    if(!twi_write_byte(buf[i])) return 3;//received NACK on transmit of data
+  if(!twi_write_byte(((address << 1) | 0) & 0xFF)) {
+    if (sendStop) twi_write_stop();
+    return 2; //received NACK on transmit of address
+  }
+  for(i=0; i<len; i++) {
+    if(!twi_write_byte(buf[i])) {
+      if (sendStop) twi_write_stop();
+      return 3;//received NACK on transmit of data
+    }
   }
   if(sendStop) twi_write_stop();
   i = 0;
@@ -168,7 +174,10 @@ unsigned char twi_writeTo(unsigned char address, unsigned char * buf, unsigned i
 unsigned char twi_readFrom(unsigned char address, unsigned char* buf, unsigned int len, unsigned char sendStop){
   unsigned int i;
   if(!twi_write_start()) return 4;//line busy
-  if(!twi_write_byte(((address << 1) | 1) & 0xFF)) return 2;//received NACK on transmit of address
+  if(!twi_write_byte(((address << 1) | 1) & 0xFF)) {
+    if (sendStop) twi_write_stop();
+    return 2;//received NACK on transmit of address
+  }
   for(i=0; i<(len-1); i++) buf[i] = twi_read_byte(false);
   buf[len-1] = twi_read_byte(true);
   if(sendStop) twi_write_stop();

cores/esp8266/libc_replacements.c

@@ -393,24 +393,6 @@ int* __errno(void) {
     return &errno_var;
 }
 
-
-char * ctime(const time_t *clock) {
-    return 0;
-}
-
-time_t time(time_t * t) {
-    return 0;
-}
-
-int gettimeofday(void *tp, void *tzp) {
-    return 0;
-}
-
-time_t mktime(struct tm *timp) {
-    return 0;
-}
-
-
 /*
  * begin newlib/string/strlcpy.c
  *

cores/esp8266/time.c

@@ -0,0 +1,128 @@
+/*
+ * time.c - ESP8266-specific functions for SNTP
+ * Copyright (c) 2015 Peter Dobler. All rights reserved.
+ * This file is part of the esp8266 core for Arduino environment.
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+ * See the GNU Lesser General Public License for more details.
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ *
+ */
+
+#include <time.h>
+#include "sntp.h"
+
+
+#ifndef _TIMEVAL_DEFINED
+#define _TIMEVAL_DEFINED
+struct timeval {
+  time_t      tv_sec;
+  suseconds_t tv_usec;
+};
+#endif
+
+extern char* sntp_asctime(const struct tm *t);
+extern struct tm* sntp_localtime(const time_t *clock);
+
+// time gap in seconds from 01.01.1900 (NTP time) to 01.01.1970 (UNIX time)
+#define DIFF1900TO1970 2208988800UL
+
+static int s_daylightOffset_sec = 0;
+static int s_timezone_sec = 0;
+static time_t s_bootTime = 0;
+
+// calculate offset used in gettimeofday
+static void ensureBootTimeIsSet()
+{
+    if (!s_bootTime)
+    {
+        time_t now = sntp_get_current_timestamp();
+        if (now)
+        {
+            s_bootTime =  - millis() / 1000;
+        }
+    }
+}
+
+static void setServer(int id, const char* name_or_ip)
+{
+    if (name_or_ip)
+    {
+        //TODO: check whether server is given by name or IP
+        sntp_setservername(0, (char*) name_or_ip);
+    }
+}
+
+void configTime(int timezone, int daylightOffset_sec, const char* server1, const char* server2, const char* server3)
+{
+    sntp_stop();
+
+    setServer(0, server1);
+    setServer(1, server2);
+    setServer(2, server3);
+
+    s_timezone_sec = timezone;
+    s_daylightOffset_sec = daylightOffset_sec;
+    sntp_set_timezone(timezone/3600);
+    sntp_init();
+}
+
+int clock_gettime(clockid_t unused, struct timespec *tp)
+{
+    tp->tv_sec  = millis() / 1000;
+    tp->tv_nsec = micros() * 1000;
+    return 0;
+}
+
+// seconds since 1970
+time_t mktime(struct tm *t)
+{
+    // system_mktime expects month in range 1..12
+    #define START_MONTH 1
+    return DIFF1900TO1970 + system_mktime(t->tm_year, t->tm_mon + START_MONTH, t->tm_mday, t->tm_hour, t->tm_min, t->tm_sec);
+}
+
+time_t time(time_t * t)
+{
+    time_t seconds = sntp_get_current_timestamp();
+    ensureBootTimeIsSet();
+    if (t)
+    {
+        *t = seconds;
+    }
+    return seconds;
+}
+
+char* asctime(const struct tm *t)
+{
+    return sntp_asctime(t);
+}
+
+struct tm* localtime(const time_t *clock)
+{
+    return sntp_localtime(clock);
+}
+
+char* ctime(const time_t *t)
+{
+    struct tm* p_tm = localtime(t);
+    char* result = asctime(p_tm);
+    return result;
+}
+
+int gettimeofday(struct timeval *tp, void *tzp)
+{
+    if (tp)
+    {
+        ensureBootTimeIsSet();
+        tp->tv_sec  = (s_bootTime + millis()) / 1000;
+        tp->tv_usec = micros() * 1000;
+    }
+}

doc/ota_updates.md

@@ -7,47 +7,45 @@ title: OTA Update
  * [Arduino IDE](#arduino-ide)
  * [HTTP Server](#http-server)
  * [Stream Interface](#stream-interface)
- 
+
 ## Basic Requirements
 
-- Flash chip size is 2x the size of the sketch
- 
+- Flash chip size is 2x the size of the sketch.
+
 ## Arduino IDE
 
 TODO describe Arduino IDE OTA process
 
 #### Requirements
- - The ESP and the Computer must be connected to the Same network.
-
+ - The ESP and the computer must be connected to the same network.
 
 ## HTTP Server
 
-the ```ESPhttpUpdate``` class can check for updates and download a binary file form a HTTP web server.
-It is possible to download updates from every IP or domain address on the Network or Internet.
-
+```ESPhttpUpdate``` class can check for updates and download a binary file from HTTP web server.
+It is possible to download updates from every IP or domain address on the network or Internet.
 
 #### Requirements
  - web server
 
-
 #### Arduino code
 
-##### simple updater
+##### Simple updater
 
-the Simple Updater downloads the File every time the function is called.
+Simple updater downloads the file every time the function is called.
 
 ```cpp
 ESPhttpUpdate.update("192.168.0.2", 80, "/arduino.bin");
 ```
 
-##### advanced updater
+##### Advanced updater
 
-Its possible to point to a script at the server.
-If a version String is delivered to the Function this String will be send to the server.
-A Server side Update check is now possible.
+Its possible to point update function to a script at the server.
+If version string argument is given, it will be sent to the server.
+Server side script can use this to check if update should be performed.
 
-the Server can return a binary file for update (Header 200)
-or it return header 304 to notify the ESP that no Update is needed.
+Server side script can respond as follows:
+- response code 200, and send the firmware image,
+- or response code 304 to notify ESP that no update is required.
 
 ```cpp
 t_httpUpdate_return ret = ESPhttpUpdate.update("192.168.0.2", 80, "/esp/update/arduino.php", "optional current version string here");
@@ -59,23 +57,23 @@ switch(ret) {
 		Serial.println("[update] Update no Update.");
 		break;
 	case HTTP_UPDATE_OK:
-		Serial.println("[update] Update ok."); // may not called we reboot the ESP 
+		Serial.println("[update] Update ok."); // may not called we reboot the ESP
 		break;
 }
 ```
 
 #### Server request handling
 
-##### simple updater
+##### Simple updater
 
-for the simple Updater the Server only needs to deliver the binary file for update.
+For the simple updater the server only needs to deliver the binary file for update.
 
-##### advanced updater
+##### Advanced updater
 
-for advanced update management a Script needs to run at the Server side, for example a PHP script.
-at every Update request the the ESP sends some informations in the Header to the Server
+For advanced update management a script needs to run at the server side, for example a PHP script.
+At every update request the the ESP sends some information in HTTP headers to the server.
 
-example Header data:
+Example header data:
 ```
 	[HTTP_USER_AGENT] => ESP8266-http-Update
     [HTTP_X_ESP8266_STA_MAC] => 18:FE:AA:AA:AA:AA
@@ -87,10 +85,9 @@ example Header data:
     [HTTP_X_ESP8266_VERSION] => DOOR-7-g14f53a19
 ```
 
-with this information the script now can check if a update is needed.
-It is also possible to deliver different binary´s based on the MAC address for example.
+With this information the script now can check if a update is needed. It is also possible to deliver different binaries based on the MAC address for example.
 
-script example:
+Script example:
 ```php
 <?PHP
 
@@ -118,10 +115,10 @@ if(!check_header('HTTP_USER_AGENT', 'ESP8266-http-Update')) {
 	header($_SERVER["SERVER_PROTOCOL"].' 403 Forbidden', true, 403);
 	echo "only for ESP8266 updater!\n";
 	exit();
-} 
+}
 
 if(
-	!check_header('HTTP_X_ESP8266_STA_MAC') || 
+	!check_header('HTTP_X_ESP8266_STA_MAC') ||
 	!check_header('HTTP_X_ESP8266_AP_MAC') ||
 	!check_header('HTTP_X_ESP8266_FREE_SPACE') ||
 	!check_header('HTTP_X_ESP8266_SKETCH_SIZE') ||
@@ -145,18 +142,14 @@ if(isset($db[$_SERVER['HTTP_X_ESP8266_STA_MAC']])) {
 	} else {
 		header($_SERVER["SERVER_PROTOCOL"].' 304 Not Modified', true, 304);
 	}
+	exit();
 }
 
 header($_SERVER["SERVER_PROTOCOL"].' 500 no version for ESP MAC', true, 500);
 
 ```
 
 
-## Stream Interface
-
-TODO describe Stream Interface update proccess
+## Updater class
 
-```cpp
-	ESP.updateSketch(client, length);
-```
- 
+TODO describe Updater class

libraries/ESP8266WiFi/src/WiFiClientSecure.cpp

@@ -267,6 +267,9 @@ int WiFiClientSecure::available() {
 }
 
 uint8_t WiFiClientSecure::connected() {
+    if (!_client)
+        return 0;
+        
     if (_client->state() == ESTABLISHED)
         return 1;
 

tests/Time/Time.ino

@@ -0,0 +1,35 @@
+#include <ESP8266WiFi.h>
+#include <time.h>
+
+const char* ssid = "..........";
+const char* password = "..........";
+
+int timezone = 3;
+int dst = 0;
+
+void setup() {
+  Serial.begin(115200);
+  Serial.setDebugOutput(true);
+
+  WiFi.mode(WIFI_STA);
+  WiFi.begin(ssid, password);
+  Serial.println("\nConnecting to WiFi");
+  while (WiFi.status() != WL_CONNECTED) {
+    Serial.print(".");
+    delay(1000);
+  }
+
+  configTime(3 * 3600, 0, "pool.ntp.org", "time.nist.gov");
+  Serial.println("\nWaiting for time");
+  while (!time(nullptr)) {
+    Serial.print(".");
+    delay(1000);
+  }
+  Serial.println("");
+}
+
+void loop() {
+  time_t now = time(nullptr);
+  Serial.println(ctime(&now));
+  delay(1000);
+}