Find a Fire Truck with the ESP from XML and turn on an LED
Posted: Mon Mar 27, 2017 11:34 amI have a XML feed http://www.toronto.ca/fire/cadinfo/livecad.xml that shows if a Fire Truck in Toronto Canada is on the road. I want to find a specific Fire Truck then turn ON an LED attached to the ESP. If not found keep LED OFF. I have added a sample XML feed and below that is my NOOB attempt at the code. I want to find 3 different trucks and turn on 3 different LEDS (R421 A421 LA421)
The problem I'm having is that String content = client.readStringUntil('\n'); reads line by line and if the truck say R421 is found it turns ON the LED but then continues reading down the page and turns it OFF again.
1. Can String content = client.readStringUntil('\n'); read the entire page at once into a String and not line by line?
2. How can i loop through or add the additional trucks?
XML Sample
My arduino code is
The problem I'm having is that String content = client.readStringUntil('\n'); reads line by line and if the truck say R421 is found it turns ON the LED but then continues reading down the page and turns it OFF again.
1. Can String content = client.readStringUntil('\n'); read the entire page at once into a String and not line by line?
2. How can i loop through or add the additional trucks?
XML Sample
Code: Select all
<tfs_active_incidents>
<update_from_db_time>2017-03-27 11:58:25</update_from_db_time>
<event>
<prime_street>DUFFERIN ST NY_HARVEY'S ,</prime_street>
<cross_streets>/</cross_streets>
<dispatch_time>2017-03-27 11:53:37</dispatch_time>
<event_num>F17027706</event_num>
<event_type>Medical - Trouble Breathing</event_type>
<alarm_lev>0</alarm_lev>
<beat>145</beat>
<units_disp>P142,</units_disp>
</event>
<event>
<prime_street>HUMBER BLVD, YK</prime_street>
<cross_streets>ALLIANCE AVE / HILLDALE RD</cross_streets>
<dispatch_time>2017-03-14 17:22:57</dispatch_time>
<event_num>F17023566</event_num>
<event_type>Alarm Highrise Residential</event_type>
<alarm_lev>0</alarm_lev>
<beat>421</beat>
<units_disp> R421, A421, R423, C42, LA421</units_disp>
</event>
</tfs_active_incidents>My arduino code is
Code: Select all
#include <ESP8266WiFi.h>
const char* ssid = "*********"; //actual removed
const char* password = "******"; //actual removed
////LIVE SERVER/////
//const char* host = "www.toronto.ca";
//String url = "/fire/cadinfo/livecad.xml";
////////////////////////////
////LOCAL TEST SERVER/////
const char* host = "192.168.1.103";
String url = "/tfs.xml";
////////////////////////////
int find_text(String needle, String haystack,int from) {
int foundpos = -1;
if (haystack.length()<needle.length())
return foundpos;
for (int i = from; (i < haystack.length() - needle.length()); i++) {
if (haystack.substring(i,needle.length()+i) == needle) {
foundpos = i;
return foundpos;
}
}
return foundpos;
}
void setup() {
Serial.begin(115200);
delay(100);
pinMode(5, OUTPUT); //WIFI Indicator
pinMode(14, OUTPUT); // First Truck
pinMode(12, OUTPUT); // Second Truck
pinMode(13, OUTPUT); // Third Truck
// We start by connecting to a WiFi network
Serial.println();
Serial.println();
Serial.print("Connecting to ");
Serial.println(ssid);
WiFi.begin(ssid, password);
while (WiFi.status() != WL_CONNECTED) {
delay(500);
Serial.print(".");
}
digitalWrite(5, HIGH);
delay(250);
digitalWrite(5, LOW);
delay(250);
digitalWrite(5, HIGH);
delay(250);
digitalWrite(5, LOW);
delay(250);
digitalWrite(5, HIGH);
delay(250);
Serial.println("");
Serial.println("WiFi connected");
Serial.println("IP address: ");
Serial.println(WiFi.localIP());
Serial.println();
Serial.println();
Serial.println("LED Test");
// Blink LEDS for test CODE REMOVED for now
}
void loop() {
// Use WiFiClient class to create TCP connections
WiFiClient client;
const int httpPort = 80;
if (!client.connect(host, httpPort)) {
Serial.println("connection failed");
}
// We now create a URI for the request
Serial.print("Requesting URL: ");
Serial.println(url);
Serial.println();
// This will send the request to the server
client.print(String("GET ") + url + " HTTP/1.1\r\n" +
"Host: " + host + "\r\n" +
"Connection: close\r\n\r\n");
delay(500);
// FIND R421
while(client.available()){
String content = client.readStringUntil('\n');
Serial.print(content);
Serial.println();
int R421 = find_text("R421",content,0);
if (R421 == -1)
{
Serial.println(R421);
digitalWrite(14, LOW);
}
else
{
Serial.println();
Serial.println();
Serial.println();
Serial.println("---------------------------------");
Serial.println(R421);
Serial.println("R421 On Call");
digitalWrite(14, HIGH);
Serial.println("---------------------------------");
Serial.println();
Serial.println();
Serial.println();
}
}
delay(15000);//15sec
// delay(30000);//30sec
// delay(180000);//3min
}