ESP8266WebServer not serving json data

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ESP8266WebServer not serving json data

By toni
- Tue Aug 07, 2018 4:18 am #77615 Hi all!

I'm trying to show live data with this index.html:
Code: Select all<!DOCTYPE html>
<svg width="960" height="673" stroke="#fff" stroke-width="0.5"></svg>
<script src="https://d3js.org/d3.v4.min.js"></script>
<script src="https://d3js.org/d3-hsv.v0.1.min.js"></script>
<script src="https://d3js.org/d3-contour.v1.min.js"></script>
<script>

var svg = d3.select("svg"),
    width = +svg.attr("width"),
    height = +svg.attr("height");

var i0 = d3.interpolateHsvLong(d3.hsv(120, 1, 0.65), d3.hsv(60, 1, 0.90)),
    i1 = d3.interpolateHsvLong(d3.hsv(60, 1, 0.90), d3.hsv(0, 0, 0.95)),
    interpolateTerrain = function(t) { return t < 0.5 ? i0(t * 2) : i1((t - 0.5) * 2); },
    color = d3.scaleSequential(interpolateTerrain).domain([90, 190]);

d3.json("volcano.json", function(error, volcano) {
  if (error) throw error;

  svg.selectAll("path")
    .data(d3.contours()
        .size([volcano.width, volcano.height])
        .thresholds(d3.range(90, 195, 5))
      (volcano.values))
    .enter().append("path")
      .attr("d", d3.geoPath(d3.geoIdentity().scale(width / volcano.width)))
      .attr("fill", function(d) { return color(d.value); });
});

</script>


who expects json data as shown in the example:

https://bl.ocks.org/mbostock/4241134

The code I'm using (with some testing parts) is:
Code: Select all#include <ArduinoJson.h>
#include <ESP8266WiFi.h>
#include <WiFiClient.h>
#include <ESP8266WebServer.h>
#include <FS.h>

const char* ssid = "yourSSID";
const char* password = "yourPASS";
const char* htmlfile = "/index.html";

ESP8266WebServer server(80);


// Mux 1
int oneA = D6;
int oneB = D7;
int oneC = D5;
int oneD = D8;

// Read off Values from Here
int COM1 = A0;

// Mux 2
int twoA = D3;
int twoB = D4;
int twoC = D2;
int twoD = D1;

// Apply voltage from here
int COM2 = D0;

// since not all pins of each multiplexer are connected to rows/columns on the skin
// the following arrays indicates which pins are connected, to reflect the following:

int colPinRef [] = {
  0, 1, 2, 3, 4, 5, 6, 7
};
int rowPinRef [] = {
  0, 1, 2, 3, 4, 5, 6, 7
};

int metaMsk[16][4] = {
  { 0, 0, 0, 0 },
  { 1, 0, 0, 0 },
  { 0, 1, 0, 0 },
  { 1, 1, 0, 0 },
  { 0, 0, 1, 0 },
  { 1, 0, 1, 0 },
  { 0, 1, 1, 0 },
  { 1, 1, 1, 0 },
  { 0, 0, 0, 1 },
  { 1, 0, 0, 1 },
  { 0, 1, 0, 1 },
  { 1, 1, 0, 1 },
  { 0, 0, 1, 1 },
  { 1, 0, 1, 1 },
  { 0, 1, 1, 1 },
  { 1, 1, 1, 1 }
};

// We will read off values one row at a time, this array will store those values
int matrixSize = 1 * 8;
int matrixValues[8];

// The values of these variables will be used to select the pin from multiplexers 1 and 2
// See HEF4067B Datasheet for codes (function table)
int c0 = 0;
int c1 = 0;
int c2 = 0;
int c3 = 0;
int col = 0; // storeing the bin code

// Used to select the pin from multiplexers 3 and 4
// See HEF4067B Datasheet for codes (function table)
int r0 = 0;
int r1 = 0;
int r2 = 0;
int r3 = 0;
int row = 0; // storeing the bin code

int rowCount; // just a count

int ciclos;
long tiempoInicial;
String output;

void setup() {

  // Columns = INPUT
  // Mux 1
  pinMode(oneA, OUTPUT); //A
  pinMode(oneB, OUTPUT); //B
  pinMode(oneC, OUTPUT); //C
  pinMode(oneD, OUTPUT); //D

  // Read values from here
  pinMode(COM1, INPUT);

  // ROWS = OUTPUT
  // Mux 2
  pinMode(twoA, OUTPUT); //A
  pinMode(twoB, OUTPUT); //B
  pinMode(twoC, OUTPUT); //C
  pinMode(twoD, OUTPUT); //D

  pinMode(COM2, OUTPUT);
  digitalWrite(COM2, HIGH);

  tiempoInicial = millis();
  ciclos = 0;

  Serial.begin(115200);

  SPIFFS.begin();

  WiFi.mode(WIFI_STA);
  WiFi.begin(ssid, password);
  Serial.println("");

  // Wait for connection
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
  Serial.println("");
  Serial.print("Connected to ");
  Serial.println(ssid);
  Serial.print("IP address: ");
  Serial.println(WiFi.localIP());

  server.on("/", handleRoot);

  server.on("/volcano.json", volcano);

  server.on("/",HTTP_GET, volcano);


  server.onNotFound(handleNotFound);

  /*server.on("/index.html", HTTP_GET, []() {

    StaticJsonBuffer<1174> jsonBuffer;
    JsonObject& volcano = jsonBuffer.createObject();
    volcano["width"] = 8;
    volcano["height"] = 8;
    JsonArray& analogValues = volcano.createNestedArray("values");

    for (int rowCount = 0; rowCount < 8; rowCount++) {

      r0 = metaMsk[rowPinRef[rowCount]][0];
      r1 = metaMsk[rowPinRef[rowCount]][1];
      r2 = metaMsk[rowPinRef[rowCount]][2];
      r3 = metaMsk[rowPinRef[rowCount]][3];

      digitalWrite(twoA, r0); //send to Digital OUT 1
      digitalWrite(twoB, r1); //send to Digital OUT 2
      digitalWrite(twoC, r2); //send to Digital OUT 3
      digitalWrite(twoD, r3); //send to Digital OUT 4

      for (int colCount = 0; colCount < 8; colCount++) {

        c0 = metaMsk[colPinRef[colCount]][0];
        c1 = metaMsk[colPinRef[colCount]][1];
        c2 = metaMsk[colPinRef[colCount]][2];
        c3 = metaMsk[colPinRef[colCount]][3];

        digitalWrite(oneA, c0); //send to Digital OUT 1
        digitalWrite(oneB, c1); //send to Digital OUT 2
        digitalWrite(oneC, c2); //send to Digital OUT 3
        digitalWrite(oneD, c3); //send to Digital OUT 4

        int val = analogRead(COM1);
        matrixValues[colCount] = val;
        analogValues.add(val);
      }//end for
      delay(2);
    }//end for

    output = "";
    volcano.printTo(output);
    Serial.println("server.volc" + (output));
    server.send(200, "application/json", output);
    });*/

  server.begin();
  Serial.println("HTTP server started");

}

void loop () {
  WiFiClient(keepalive);
  WiFiClient client;

  server.handleClient();

}

void volcano() {

  StaticJsonBuffer<1174> jsonBuffer;
  JsonObject& volcano = jsonBuffer.createObject();
  volcano["width"] = 8;
  volcano["height"] = 8;
  JsonArray& analogValues = volcano.createNestedArray("values");

  for (int rowCount = 0; rowCount < 8; rowCount++) {

    r0 = metaMsk[rowPinRef[rowCount]][0];
    r1 = metaMsk[rowPinRef[rowCount]][1];
    r2 = metaMsk[rowPinRef[rowCount]][2];
    r3 = metaMsk[rowPinRef[rowCount]][3];

    digitalWrite(twoA, r0); //send to Digital OUT 1
    digitalWrite(twoB, r1); //send to Digital OUT 2
    digitalWrite(twoC, r2); //send to Digital OUT 3
    digitalWrite(twoD, r3); //send to Digital OUT 4

    for (int colCount = 0; colCount < 8; colCount++) {

      c0 = metaMsk[colPinRef[colCount]][0];
      c1 = metaMsk[colPinRef[colCount]][1];
      c2 = metaMsk[colPinRef[colCount]][2];
      c3 = metaMsk[colPinRef[colCount]][3];

      digitalWrite(oneA, c0); //send to Digital OUT 1
      digitalWrite(oneB, c1); //send to Digital OUT 2
      digitalWrite(oneC, c2); //send to Digital OUT 3
      digitalWrite(oneD, c3); //send to Digital OUT 4

      int val = analogRead(COM1);
      matrixValues[colCount] = val;
      analogValues.add(val);
    }//end for
    delay(2);
  }//end for

  output = "";
  volcano.printTo(output);
  Serial.println("volcano" + (output));
  server.send(200, "application/json", output);
  // client.println(output);

}

void handleRoot() {
  server.sendHeader("Location", "/index.html", true);  //Redirect to our html web page
  server.send(302, "text/plane", "");
}

void handleNotFound() {
  if (loadFromSpiffs(server.uri())) return;
  String message = "File Not Found\n\n";
  message += "URI: ";
  message += server.uri();
  message += "\nMethod: ";
  message += (server.method() == HTTP_GET) ? "GET" : "POST";
  message += "\nArguments: ";
  message += server.args();
  message += "\n";
  for (uint8_t i = 0; i < server.args(); i++) {
    message += " " + server.argName(i) + ": " + server.arg(i) + "\n";
  }
  server.send(404, "text/plain", message);
}

bool loadFromSpiffs(String path) {
  String dataType = "text/plain";
  if (path.endsWith("/")) path += "index.htm";
  if (path.endsWith(".src")) path = path.substring(0, path.lastIndexOf("."));
  else if (path.endsWith(".html")) dataType = "text/html";
  else if (path.endsWith(".htm")) dataType = "text/html";
  else if (path.endsWith(".css")) dataType = "text/css";
  else if (path.endsWith(".js")) dataType = "application/javascript";
  else if (path.endsWith(".png")) dataType = "image/png";
  else if (path.endsWith(".gif")) dataType = "image/gif";
  else if (path.endsWith(".jpg")) dataType = "image/jpeg";
  else if (path.endsWith(".ico")) dataType = "image/x-icon";
  else if (path.endsWith(".xml")) dataType = "text/xml";
  else if (path.endsWith(".pdf")) dataType = "application/pdf";
  else if (path.endsWith(".zip")) dataType = "application/zip";
  File dataFile = SPIFFS.open(path.c_str(), "r");
  if (server.hasArg("download")) dataType = "application/octet-stream";
  if (server.streamFile(dataFile, dataType) != dataFile.size()) {
  }

  dataFile.close();
  return true;
}


I've tried different ways, but none of them works, webserver does not refresh new data. What is wrong?

Thank you,

Toni
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