v1.5.0 to reduce String usage

### Major Releases v1.5.0

1. Reduce usage of Arduino String with std::string
2. Optimize library code and examples by using **reference-passing instead of value-passing**.
3. Update `Packages' Patches`
4. Add more ESP32/ESP8266 supporting code

Author: khoih-prog

CONTRIBUTING.md

@@ -14,8 +14,8 @@ If you don't find anything, please [open a new issue](https://github.com/khoih-p
 
 Please ensure to specify the following:
 
-* Arduino IDE version (e.g. 1.8.16) or Platform.io version
-* `SAMD` Core Version (e.g. Arduino SAMD core v1.8.11, Adafruit SAMD core v1.7.5, Seeed Studio SAMD v1.8.2)
+* Arduino IDE version (e.g. 1.8.18) or Platform.io version
+* Board Core Version (e.g. Arduino SAMDUE core v1.6.12, ESP8266 core v3.0.2, ArduinoCore-mbed v2.6.1, etc.)
 * Contextual information (e.g. what you were trying to achieve)
 * Simplest possible steps to reproduce
 * Anything that might be relevant in your opinion, such as:
@@ -26,10 +26,11 @@ Please ensure to specify the following:
 ### Example
 
 ```
-Arduino IDE version: 1.8.16
-Arduino SAMD Core Version 1.8.11
+Arduino IDE version: 1.8.18
+RASPBERRY_PI_PICO board
+ArduinoCore-mbed v2.6.1
 OS: Ubuntu 20.04 LTS
-Linux xy-Inspiron-3593 5.4.0-88-generic #99-Ubuntu SMP Thu Sep 23 17:29:00 UTC 2021 x86_64 x86_64 x86_64 GNU/Linux
+Linux xy-Inspiron-3593 5.4.0-91-generic #102-Ubuntu SMP Fri Nov 5 16:31:28 UTC 2021 x86_64 x86_64 x86_64 GNU/Linux
 
 Context:
 I encountered an endless loop while trying to connect to Local WiFi.

README.md

@@ -12,6 +12,7 @@
 ## Table of Contents
 
 * [Changelog](#changelog)
+  * [Major Releases v1.5.0](#major-releases-v150)
   * [Releases v1.4.2](#releases-v142)
   * [Releases v1.4.1](#releases-v141)
   * [Major Releases v1.4.0](#major-releases-v140)
@@ -34,6 +35,13 @@
 
 ## Changelog
 
+### Major Releases v1.5.0
+
+1. Reduce usage of Arduino String with std::string
+2. Optimize library code and examples by using **reference-passing instead of value-passing**.
+3. Update `Packages' Patches`
+4. Add more ESP32/ESP8266 supporting code
+
 ### Releases v1.4.2
 
 1. Update `platform.ini` and `library.json` to use original `khoih-prog` instead of `khoih.prog` after PIO fix

changelog.md

@@ -104,6 +104,37 @@ void handleNotFound()
   digitalWrite(led, 0);
 }
 
+#if (defined(WIFI_WEBSERVER_VERSION_INT) && (WIFI_WEBSERVER_VERSION_INT >= 1005000))
+
+WWString initHeader = "<svg xmlns=\"http://www.w3.org/2000/svg\" version=\"1.1\" width=\"310\" height=\"150\">\n" \
+                      "<rect width=\"310\" height=\"150\" fill=\"rgb(250, 230, 210)\" stroke-width=\"3\" stroke=\"rgb(0, 0, 0)\" />\n" \
+                      "<g stroke=\"blue\">\n";
+
+void drawGraph()
+{
+  WWString out;
+  
+  out.reserve(3000);
+  char temp[70];
+  
+  out += initHeader;
+  
+  int y = rand() % 130;
+
+  for (int x = 10; x < 300; x += 10)
+  {
+    int y2 = rand() % 130;
+    sprintf(temp, "<line x1=\"%d\" y1=\"%d\" x2=\"%d\" y2=\"%d\" stroke-width=\"2\" />\n", x, 140 - y, x + 10, 140 - y2);
+    out += temp;
+    y = y2;
+  }
+  out += "</g>\n</svg>\n";
+
+  server.send(200, "image/svg+xml", fromWWString(out));
+}
+
+#else
+
 void drawGraph()
 {
   String out;
@@ -127,7 +158,9 @@ void drawGraph()
   server.send(200, F("image/svg+xml"), out);
 }
 
-void setup(void)
+#endif
+
+void setup()
 {
   pinMode(led, OUTPUT);
   digitalWrite(led, 0);
@@ -220,7 +253,39 @@ void setup(void)
   Serial.println(WiFi.localIP());
 }
 
-void loop(void)
+void heartBeatPrint()
+{
+  static int num = 1;
+
+  Serial.print(F("H"));
+
+  if (num == 80)
+  {
+    Serial.println();
+    num = 1;
+  }
+  else if (num++ % 10 == 0)
+  {
+    Serial.print(F(" "));
+  }
+}
+
+void check_status()
+{
+  static unsigned long checkstatus_timeout = 0;
+
+#define STATUS_CHECK_INTERVAL     60000L
+
+  // Send status report every STATUS_REPORT_INTERVAL (60) seconds: we don't need to send updates frequently if there is no status change.
+  if ((millis() > checkstatus_timeout) || (checkstatus_timeout == 0))
+  {
+    heartBeatPrint();
+    checkstatus_timeout = millis() + STATUS_CHECK_INTERVAL;
+  }
+}
+
+void loop()
 {
   server.handleClient();
+  check_status();
 }

examples/AdvancedWebServer/AdvancedWebServer.ino

@@ -74,7 +74,7 @@ void handleNotFound()
   digitalWrite(led, 0);
 }
 
-void setup(void)
+void setup()
 {
   // Open serial communications and wait for port to open:
   Serial.begin(115200);
@@ -153,7 +153,7 @@ void setup(void)
   Serial.println(WiFi.localIP());
 }
 
-void loop(void)
+void loop()
 {
   server.handleClient();
 }

examples/HelloServer/HelloServer.ino

@@ -74,7 +74,7 @@ void handleNotFound()
   digitalWrite(led, 0);
 }
 
-void setup(void)
+void setup()
 {
   pinMode(led, OUTPUT);
   digitalWrite(led, 0);
@@ -177,7 +177,7 @@ void setup(void)
   Serial.println(WiFi.localIP());
 }
 
-void loop(void)
+void loop()
 {
   server.handleClient();
 }

examples/HelloServer2/HelloServer2.ino

@@ -111,7 +111,7 @@ void handleNotFound()
   digitalWrite(led, 0);
 }
 
-void setup(void)
+void setup()
 {
   pinMode(led, OUTPUT);
   digitalWrite(led, 0);
@@ -189,7 +189,7 @@ void setup(void)
   Serial.println(WiFi.localIP());
 }
 
-void loop(void)
+void loop()
 {
   server.handleClient();
 }

examples/PostServer/PostServer.ino

@@ -141,7 +141,7 @@ void handleNotFound()
   server.send(404, F("text/plain"), message);
 }
 
-void setup(void)
+void setup()
 {
   Serial.begin(115200);
   while (!Serial);
@@ -224,7 +224,7 @@ void setup(void)
   Serial.println(WiFi.localIP());
 }
 
-void loop(void)
+void loop()
 {
   server.handleClient();
 }

examples/SimpleAuthentication/SimpleAuthentication.ino

@@ -1,18 +1,18 @@
 /****************************************************************************************************************************
   WebClient.ino - Simple Arduino web server sample for SAMD21 running WiFiNINA shield
   For any WiFi shields, such as WiFiNINA W101, W102, W13x, or custom, such as ESP8266/ESP32-AT, Ethernet, etc
-  
+
   WiFiWebServer is a library for the ESP32-based WiFi shields to run WebServer
   Based on and modified from ESP8266 https://github.com/esp8266/Arduino/releases
   Based on  and modified from Arduino WiFiNINA library https://www.arduino.cc/en/Reference/WiFiNINA
   Built by Khoi Hoang https://github.com/khoih-prog/WiFiWebServer
   Licensed under MIT license
-  
+
   A simple web server that shows the value of the analog input pins via a web page using an ESP8266 module.
   This sketch will start an access point and print the IP address of your ESP8266 module to the Serial monitor.
   From there, you can open that address in a web browser to display the web page.
   The web page will be automatically refreshed each 20 seconds.
-  
+
   For more details see: http://yaab-arduino.blogspot.com/p/wifiesp.html
  ***************************************************************************************************************************************/
 #include "defines.h"
@@ -47,7 +47,7 @@ void setup()
   while (!Serial);
 
   Serial.print(F("\nStarting WebClient on "));  Serial.print(BOARD_NAME);
-  Serial.print(F(" with ")); Serial.println(SHIELD_TYPE); 
+  Serial.print(F(" with ")); Serial.println(SHIELD_TYPE);
   Serial.println(WIFI_WEBSERVER_VERSION);
 
 #if WIFI_USING_ESP_AT
@@ -58,46 +58,46 @@ void setup()
   WiFi.init(&EspSerial);
 
   Serial.println(F("WiFi shield init done"));
-  
+
 #endif
 
 #if !(ESP32 || ESP8266)
-  
+
   // check for the presence of the shield
-  #if USE_WIFI_NINA
-    if (WiFi.status() == WL_NO_MODULE)
-  #else
-    if (WiFi.status() == WL_NO_SHIELD)
-  #endif
-    {
-      Serial.println(F("WiFi shield not present"));
-      // don't continue
-      while (true);
-    }
-
-  #if USE_WIFI_NINA
-    String fv = WiFi.firmwareVersion();
-    
-    if (fv < WIFI_FIRMWARE_LATEST_VERSION)
-    {
-      Serial.println(F("Please upgrade the firmware"));
-    }
-  #endif
-  
+#if USE_WIFI_NINA
+  if (WiFi.status() == WL_NO_MODULE)
+#else
+  if (WiFi.status() == WL_NO_SHIELD)
+#endif
+  {
+    Serial.println(F("WiFi shield not present"));
+    // don't continue
+    while (true);
+  }
+
+#if USE_WIFI_NINA
+  String fv = WiFi.firmwareVersion();
+
+  if (fv < WIFI_FIRMWARE_LATEST_VERSION)
+  {
+    Serial.println(F("Please upgrade the firmware"));
+  }
+#endif
+
 #endif
 
   Serial.print(F("Connecting to SSID: "));
   Serial.println(ssid);
-  
+
   status = WiFi.begin(ssid, pass);
 
   delay(1000);
-   
+
   // attempt to connect to WiFi network
   while ( status != WL_CONNECTED)
   {
     delay(500);
-        
+
     // Connect to WPA/WPA2 network
     status = WiFi.status();
   }
@@ -120,7 +120,7 @@ void setup()
   }
 }
 
-void printoutData(void)
+void printoutData()
 {
   // if there are incoming bytes available
   // from the server, read them and print them

examples/WebClient/WebClient.ino

@@ -17,6 +17,8 @@ FunctionRequestHandler  KEYWORD1
 StaticRequestHandler  KEYWORD1
 WiFi_RingBuffer  KEYWORD1
 
+WWString  KEYWORD1
+
 #######################
 # WiFiHttpClient
 #######################