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Paweł Klockiewicz
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‎WebHostMonitor.ino

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/*----------------------------------------------------------------
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Name: Web Host Monitor
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Desc: Status monitor of hosts that can be entered using
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the web interface.
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Date: 13.06.2016
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Author: Paweł Klockiewicz @ CDV
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----------------------------------------------------------------*/
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#include <SPI.h>
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#include <Ethernet.h>
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#include <LiquidCrystal.h>
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#include <SdFat.h>
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#include <NettigoKeypad.h>
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#include <aWOT.h>
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// Disable warnings before converting strings to 'char *'
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#pragma GCC diagnostic ignored "-Wwrite-strings"
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// MAC Address and IP of Arduino
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byte mac[] = { 0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED };
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// IPAddress ip(192, 168, 2, 8);
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IPAddress ip(192, 168, 0, 2);
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// Server library initialization
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EthernetServer server(80);
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// Network Client initialization
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EthernetClient client;
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// SdFat object initialization
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SdFat SD;
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// Host list variables
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char hostsNames[4][20];
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int hostsCount;
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int maxHosts = 4;
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int currentHost = -1;
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// LCD library initialization
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LiquidCrystal lcd(8, 9, 4, 5, 6, 7);
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// Object for button reading
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NG_Keypad keypad;
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// Object for the web interface
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WebApp app;
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/**
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* Display Intro
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* Displays a welcome message
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*/
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void displayIntro()
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{
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Serial.println(F("WEB HOST MONITOR"));
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Serial.print(F("You have "));
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Serial.print(hostsCount);
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Serial.println(F(" hosts"));
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lcd.clear();
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lcd.print("WEB HOST MONITOR");
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lcd.setCursor(0,1);
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lcd.print("You have ");
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lcd.print(hostsCount);
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lcd.print(" hosts");
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}
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/**
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* LCD Printer
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* Displays text on LCD
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*/
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void lcdPrint(char a[], char b[] = 0)
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{
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lcd.clear();
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lcd.setCursor(0,0);
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lcd.print(a);
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lcd.setCursor(0,1);
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lcd.print(b);
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}
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/**
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* Save Hosts
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* Writes a list of hosts to the `hosts.txt` file
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*/
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void saveHosts(char data[])
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{
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SdFile wrfile;
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if(!wrfile.open("hosts.txt", O_RDWR | O_CREAT | O_TRUNC))
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Serial.println(F("Opening hosts.txt failed!"));
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else
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{
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Serial.println(F("Writing data to file..."));
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wrfile.println(data);
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wrfile.close();
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Serial.println(F("Writing done."));
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}
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}
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/**
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* Get Hosts
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* Gets the list of hosts from the `hosts.txt` file
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*/
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void getHosts()
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{
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char line[20];
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int n, i(0);
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SdFile rdfile("hosts.txt", O_READ);
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if (!rdfile.isOpen())
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Serial.println(F("Failed to open hosts.txt"));
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// read lines from the file
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while (((n = rdfile.fgets(line, sizeof(line))) > 0) && (i < maxHosts))
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{
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if (line[0] != '\n')
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{
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strtok(line, "\r\n");
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strcpy(hostsNames[i], line);
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i++;
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}
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}
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hostsCount = i;
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}
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/**
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* Next Host
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* Starts the monitor for the next host
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*/
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void nextHost()
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{
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currentHost++;
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if(currentHost > (hostsCount - 1))
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currentHost = 0;
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runMonitor(hostsNames[currentHost]);
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}
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/**
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* Previous Host
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* Starts the monitor for the previous host
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*/
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void prevHost()
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{
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currentHost--;
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if(currentHost < 0)
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currentHost = (hostsCount - 1);
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runMonitor(hostsNames[currentHost]);
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}
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/**
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* Host Monitor
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* Check if host is available online
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*/
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void runMonitor(char* host)
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{
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if(client.connect(host, 80))
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{
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if(client.connected() || client.available())
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{
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Serial.print(host);
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Serial.println(F(" is UP!"));
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lcdPrint(host, "is UP!");
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}
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else
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{
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Serial.print(host);
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Serial.println(F(" is DOWN!"));
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lcdPrint(host, "is DOWN!");
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}
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}
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else
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{
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Serial.println(F("Connection failed"));
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lcdPrint("Connection", "failed");
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}
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client.stop();
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}
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/**
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* Index CMD
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* Supports server side requests
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*/
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void indexCmd(Request &req, Response &res)
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{
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char *queryHosts = req.query("hosts");
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int i;
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if(strlen(queryHosts) > 4)
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{
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saveHosts(queryHosts);
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getHosts();
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displayIntro();
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}
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P(part_one) =
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"<html>\n"
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"<head>\n"
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"<title>Web Host Monitor</title>\n"
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"<meta name='viewport' content='width=device-width, initial-scale=1'>\n"
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"</head>\n"
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"<body>\n"
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"<h1>Web Host Monitor</h1>\n"
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"<h3>Your hosts (max 4):</h3>\n"
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"<form method='get'>\n"
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"<textarea name='hosts' rows='4' cols='24'>";
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P(part_two) =
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"</textarea><br/>\n"
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"<button type='submit'>Save</button>\n"
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"</form>\n"
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"</body>\n"
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"</html>";
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res.success("text/html");
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res.printP(part_one);
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// hosts list
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for(i = 0; i < hostsCount; i++)
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{
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if((i + 1) == hostsCount)
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res.print(hostsNames[i]);
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else
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res.println(hostsNames[i]);
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}
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res.printP(part_two);
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}
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/**
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* Arduino Setup
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* Settings - one-time instruction block
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*/
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void setup()
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{
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// Initialize communication on serial port
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Serial.begin(9600);
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// Initialization of the SD card reader
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if (!SD.begin(4))
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{
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Serial.println(F("SD Card Reader initialization failed!"));
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return;
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}
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// Get a list of hosts
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getHosts();
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// Initialization of network settings
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Ethernet.begin(mac, ip);
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Serial.println(Ethernet.localIP());
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// Routing to handle URL requests
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app.get("/", &indexCmd);
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// Operation of buttons
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keypad.register_handler(NG_Keypad::UP, prevHost);
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keypad.register_handler(NG_Keypad::DOWN, nextHost);
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keypad.register_handler(NG_Keypad::RIGHT, nextHost);
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keypad.register_handler(NG_Keypad::LEFT, prevHost);
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// Initialization of LCD display
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lcd.begin(16, 2);
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// Intro message
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displayIntro();
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}
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/**
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* Arduino Loop
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* Infinite block of instructions
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*/
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void loop()
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{
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int rd = analogRead(0);
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keypad.check_handlers(rd);
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EthernetClient client = server.available();
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if (client)
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{
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app.process(&client);
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client.stop();
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}
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delay(100);
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}

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