Add ESP8266 example with dual interfaces

Playing around with the use of dual interfaces on the ESP, using UIP for RF24 stack and LWIP for ESP Wifi - Looking at potential/need to support LWIP stack directly with RF24Ethernet
DimyDisconzi · Nov 10, 2015 · 834da23 · 834da23
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diff --git a/examples/InteractiveServer_Mesh_ESPWifi/HTML.h b/examples/InteractiveServer_Mesh_ESPWifi/HTML.h
@@ -0,0 +1,202 @@
+
+#if !defined (ARDUINO_ARCH_AVR)
+  #define strncpy_P strncpy
+#endif
+
+bool led_state = 0;
+
+/**
+* This page stores the actual HTML code that will be presented.
+* The data is stored in program memory as a single long string, and is presented
+* below in a manageable format
+*/
+
+/***************************************************************/
+
+// The basic beginning of an HTML connection, plus
+// a style (CSS) section and header to be used on every page
+  static const char begin_html[] PROGMEM =
+  "HTTP/1.1 200 OK\n"
+  "Content-Type: text/html\n" //40b 
+  "Connection: close\n\n" //59
+  "<!DOCTYPE HTML>\n" //75 
+  "<html><head>"//87
+  "<style>\n"
+  "body{background-color:linen; text-align: center}"
+  "table.center{margin-left:auto;margin-right:auto;}"
+  "</style>"
+  "</head>";
+
+/***************************************************************/
+
+// The main HTML page, broken into 2 parts
+// It is broken up so some variables can be printed manually in the middle
+static const char main_html_p1[] PROGMEM =
+
+  "<body>"
+  "<img src='http://arduino.cc/en/uploads/Trademark/ArduinoCommunityLogo.png'"
+  "style='width:383px;height:162px'>"
+  "<br><b>Hello From Arduino!</b><br>\n"
+  "<br><br> LED/Digital Pin Control:"
+  "<br><br>\n<table class = 'center'>";
+
+/***************************************************************/
+
+static const char main_html_p2[] PROGMEM =
+
+  "<tr><td><a href='/ON'>Turn LED On</a>"
+
+  "<br></td><td><a href='/OF'>Turn LED Off</a>"
+
+  "<br></td></tr></table><br><a href='/ST'>"
+
+  "Stats</a> <a href='/CR'>Credits</a>"
+
+  "</body></html>";
+
+  /***************************************************************/
+
+  // The HTML for the credits page
+  static const char credits_html[] PROGMEM =
+  "<body>"
+  "<img src='http://arduino.cc/en/uploads/Trademark/ArduinoCommunityLogo.png'"
+  "style='width:383px;height:162px'>"
+  "<br><b>Credits:</b><br><table class='center'><tr>"
+  "<td>RF24Ethernet by </td>"
+  "<td><a href='https://github.com/tmrh20'> TMRh20</a></td>"
+  "</tr><tr>"
+  "<td>uIP by</td>"
+  "<td><a href='https://github.com/adamdunkels/uip'> Adam Dunkels</a></td>"
+  "</tr><tr>"
+  "<td>Based on</td>"
+  "<td><a href='https://github.com/ntruchsess/arduino_uip'> UIPEthernet</a></td>"
+  "</tr><tr>"
+  "<td>Documentation:</td><td> <a href='http://tmrh20.github.io/RF24Ethernet/'>github.io</a></td>"
+  "</tr>"
+  "</tr><tr>"
+  "<td>RF24toTUN creator:</td><td> <a href='https://github.com/reixd/'>Reixd</a></td>"
+  "</tr>"
+  "</table>"
+  "<br>And everybody who contributed to RF24 and RF24Network"
+  "<br><br><a href='/'>Home</a>"
+  "</body>"
+  "</html>";
+
+/***************************************************************/
+
+/**
+* This function reads from a specified program memory buffer, and sends the data to the client
+* in chunks equal to the max output buffer size or less
+* This allows the HTML code to be modified as desired, with no need to change any other code
+*/
+void sendPage(EthernetClient& _client, const char* _pointer, size_t size ){
+  for(int i=0; i<size;i++){
+    char c = pgm_read_byte(_pointer++);
+    _client.write(&c,1);
+  }
+}
+
+/***************************************************************/
+
+// Function to send the main page
+void main_page(EthernetClient& _client) {
+
+  // Send the connection info and header
+  const char* html_pointer = begin_html;
+  sendPage(_client,html_pointer,sizeof(begin_html));
+
+  //Send the first part of the page
+  html_pointer = main_html_p1;
+  sendPage(_client,html_pointer,sizeof(main_html_p1));
+
+  // Include some variables, print them into the page manually
+  const char *lState = led_state ? "ON" : "OFF";
+  const char *lColor = led_state ? "darkseagreen 1" : "lightpink";
+
+  char bf[OUTPUT_BUFFER_SIZE];
+
+  if(!led_state){
+    sprintf_P(bf,PSTR("<tr><td bgcolor=%s>\n"),lColor);
+    _client.write(bf);
+    sprintf_P(bf,PSTR("LED is %s</td></tr>\n"), lState);
+  }else{
+    sprintf_P(bf,PSTR("<tr><td> </td><td bgcolor=%s>\n"),lColor);
+    _client.write(bf);
+    sprintf_P(bf,PSTR("LED is %s</td></tr>\n"), lState);  
+  }
+  _client.write(bf);  
+
+  // Send the 2nd half of the page
+  static const char* html_pointer2 = main_html_p2;
+  sendPage(_client,html_pointer2,sizeof(main_html_p2));
+
+}
+
+/***************************************************************/
+
+void credits_page(EthernetClient& _client) {
+  //Set the pointer to the HTML connection data + header
+  const char* html_pointer = begin_html;
+  sendPage(_client,html_pointer,sizeof(begin_html));
+
+  //Set the pointer to the HTML page data and send it
+  html_pointer = credits_html;
+  sendPage(_client,html_pointer,sizeof(credits_html));
+}
+
+/***************************************************************/
+
+// The stats page is sent differently, just to demonstrate a different method of handling pages
+void stats_page(EthernetClient& _client) {
+
+  uint32_t seconds = millis() / 1000UL;
+  uint32_t minutes = seconds / 60UL;  
+  uint32_t hours = minutes / 60UL;
+  uint8_t days = hours / 24UL;
+  seconds %= 60;
+  minutes %= 60;
+  hours %= 24;
+
+  char buffer[45];
+
+  strncpy_P(buffer, PSTR("HTTP/1.1 200 OK\nContent-Type: text/html\n"),45);
+  _client.write( buffer );
+  strncpy_P(buffer, PSTR("Connection: close\n\n<!DOCTYPE HTML>\n<html>\n"),45);
+  _client.write( buffer );
+  strncpy_P(buffer, PSTR("<head><style>body{background-color:linen;}\n"),45);
+  _client.write( buffer );
+  strncpy_P(buffer, PSTR("td{border: 1px solid black;}</style></head>\n"),45);
+  _client.write( buffer );
+  strncpy_P(buffer, PSTR("<body><table><tr><td> Uptime</td><td>\n"),45);
+  _client.write( buffer );
+  sprintf_P(buffer, PSTR("%u days, %lu hours %lu minutes %lu"),days,hours,minutes,seconds);
+  _client.write( buffer );
+  strncpy_P(buffer, PSTR("seconds</td></tr><tr><td>UIP Buffer Size"),45);
+  _client.write( buffer );
+  sprintf_P(buffer, PSTR("</td><td>%u bytes</td></tr><tr><td>User "),UIP_BUFSIZE);
+  _client.write( buffer );
+  sprintf_P(buffer, PSTR("Output<br>Buffer Size</td><td>%u bytes"),OUTPUT_BUFFER_SIZE);
+  _client.write( buffer );
+  strncpy_P(buffer, PSTR("</td></tr></table><br><br>"),45);
+  _client.write( buffer );
+  strncpy_P(buffer, PSTR("<a href='/'>Home</a></body></html>"),45);
+  _client.write( buffer );
+
+}
+
+/***************************************************************/
+
+/**
+* An example of a very basic HTML page
+*/
+  static const char html_page[] PROGMEM = 
+    "HTTP/1.1 200 OK\n"
+    "Content-Type: text/html\n"
+    "Connection: close\n\n"
+    "<!DOCTYPE HTML>"
+    "<html>"
+    "<body>"
+    "<b>Hello From Arduino!</b>"
+    "</body>"
+    "</html>";
+