I am currently working on a project where the provided code for an ESP32 requires HTTP commands, however, what's provided doesn't include any sort of HTML code for webserver display. I am really confused if I am interpreting the code wrong or if I should be including the HTML code myself.
When I am connected to the access point established by the code it just shows me a blank web page.
I am very new to ESP32, so any guidance/advice would be greatly appreciated. Thank you!
#define ULTRATACT_VERSION "2.1"
const char* ssid = "UltraTactile Master";
const char* ssidMaster = "UltraTactile Master";
const char* password = "12345678";
#define BUTTON_PIN 12
#define MOD_PERIODS_DEFAULT 10
WiFiServer server(80);
#define N_TRANS 256
const float TRANS_POS[N_TRANS*3] = { -0.078749985, 0.0, 0.07874999, -0.05774999, 0.0, 0.07874999, -0.04724999, 0.0, 0.07874999, -0.068249986, 0.0, 0.06824999, -0.078749985, 0.0, 0.06824999, -0.04724999, 0.0, 0.06824999, -0.05774999, 0.0, 0.06824999, -0.068249986, 0.0, 0.07874999, -0.078749985, 0.0, 0.057749998, -0.05774999, 0.0, 0.057749998, -0.04724999, 0.0, 0.057749998, -0.068249986, 0.0, 0.04725, -0.078749985, 0.0, 0.04725, -0.04724999, 0.0, 0.04725, -0.05774999, 0.0, 0.04725, -0.068249986, 0.0, 0.057749998, -0.078749985, 0.0, 0.036750004, -0.05774999, 0.0, 0.036750004, -0.04724999, 0.0, 0.036750004, -0.068249986, 0.0, 0.026250003, -0.078749985, 0.0, 0.026250003, -0.04724999, 0.0, 0.026250003, -0.05774999, 0.0, 0.026250003, -0.068249986, 0.0, 0.036750004, -0.078749985, 0.0, 0.015750004, -0.05774999, 0.0, 0.015750004, -0.04724999, 0.0, 0.015750004, -0.068249986, 0.0, 0.0052500046, -0.078749985, 0.0, 0.0052500046, -0.04724999, 0.0, 0.0052500046, -0.05774999, 0.0, 0.0052500046, -0.068249986, 0.0, 0.015750004, -0.078749985, 0.0, -0.005249995, -0.05774999, 0.0, -0.005249995, -0.04724999, 0.0, -0.005249995, -0.068249986, 0.0, -0.015749995, -0.078749985, 0.0, -0.015749995, -0.04724999, 0.0, -0.015749995, -0.05774999, 0.0, -0.015749995, -0.068249986, 0.0, -0.005249995, -0.078749985, 0.0, -0.026249994, -0.05774999, 0.0, -0.026249994, -0.04724999, 0.0, -0.026249994, -0.068249986, 0.0, -0.036749996, -0.078749985, 0.0, -0.036749996, -0.04724999, 0.0, -0.036749996, -0.05774999, 0.0, -0.036749996, -0.068249986, 0.0, -0.026249994, -0.078749985, 0.0, -0.04724999, -0.05774999, 0.0, -0.04724999, -0.04724999, 0.0, -0.04724999, -0.068249986, 0.0, -0.05774999, -0.078749985, 0.0, -0.05774999, -0.04724999, 0.0, -0.05774999, -0.05774999, 0.0, -0.05774999, -0.068249986, 0.0, -0.04724999, -0.078749985, 0.0, -0.068249986, -0.05774999, 0.0, -0.068249986, -0.04724999, 0.0, -0.068249986, -0.068249986, 0.0, -0.078749985, -0.078749985, 0.0, -0.078749985, -0.04724999, 0.0, -0.078749985, -0.05774999, 0.0, -0.078749985, -0.068249986, 0.0, -0.068249986, -0.036749996, 0.0, 0.07874999, -0.015749995, 0.0, 0.07874999, -0.005249995, 0.0, 0.07874999, -0.026249994, 0.0, 0.06824999, -0.036749996, 0.0, 0.06824999, -0.005249995, 0.0, 0.06824999, -0.015749995, 0.0, 0.06824999, -0.026249994, 0.0, 0.07874999, -0.036749996, 0.0, 0.057749998, -0.015749995, 0.0, 0.057749998, -0.005249995, 0.0, 0.057749998, -0.026249994, 0.0, 0.04725, -0.036749996, 0.0, 0.04725, -0.005249995, 0.0, 0.04725, -0.015749995, 0.0, 0.04725, -0.026249994, 0.0, 0.057749998, -0.036749996, 0.0, 0.036750004, -0.015749995, 0.0, 0.036750004, -0.005249995, 0.0, 0.036750004, -0.026249994, 0.0, 0.026250003, -0.036749996, 0.0, 0.026250003, -0.005249995, 0.0, 0.026250003, -0.015749995, 0.0, 0.026250003, -0.026249994, 0.0, 0.036750004, -0.036749996, 0.0, 0.015750004, -0.015749995, 0.0, 0.015750004, -0.005249995, 0.0, 0.015750004, -0.026249994, 0.0, 0.0052500046, -0.036749996, 0.0, 0.0052500046, -0.005249995, 0.0, 0.0052500046, -0.015749995, 0.0, 0.0052500046, -0.026249994, 0.0, 0.015750004, -0.036749996, 0.0, -0.005249995, -0.015749995, 0.0, -0.005249995, -0.005249995, 0.0, -0.005249995, -0.026249994, 0.0, -0.015749995, -0.036749996, 0.0, -0.015749995, -0.005249995, 0.0, -0.015749995, -0.015749995, 0.0, -0.015749995, -0.026249994, 0.0, -0.005249995, -0.036749996, 0.0, -0.026249994, -0.015749995, 0.0, -0.026249994, -0.005249995, 0.0, -0.026249994, -0.026249994, 0.0, -0.036749996, -0.036749996, 0.0, -0.036749996, -0.005249995, 0.0, -0.036749996, -0.015749995, 0.0, -0.036749996, -0.026249994, 0.0, -0.026249994, -0.036749996, 0.0, -0.04724999, -0.015749995, 0.0, -0.04724999, -0.005249995, 0.0, -0.04724999, -0.026249994, 0.0, -0.05774999, -0.036749996, 0.0, -0.05774999, -0.005249995, 0.0, -0.05774999, -0.015749995, 0.0, -0.05774999, -0.026249994, 0.0, -0.04724999, -0.036749996, 0.0, -0.068249986, -0.015749995, 0.0, -0.068249986, -0.005249995, 0.0, -0.068249986, -0.026249994, 0.0, -0.078749985, -0.036749996, 0.0, -0.078749985, -0.005249995, 0.0, -0.078749985, -0.015749995, 0.0, -0.078749985, -0.026249994, 0.0, -0.068249986, 0.0052500046, 0.0, 0.07874999, 0.026250003, 0.0, 0.07874999, 0.036750004, 0.0, 0.07874999, 0.015750004, 0.0, 0.06824999, 0.0052500046, 0.0, 0.06824999, 0.036750004, 0.0, 0.06824999, 0.026250003, 0.0, 0.06824999, 0.015750004, 0.0, 0.07874999, 0.0052500046, 0.0, 0.057749998, 0.026250003, 0.0, 0.057749998, 0.036750004, 0.0, 0.057749998, 0.015750004, 0.0, 0.04725, 0.0052500046, 0.0, 0.04725, 0.036750004, 0.0, 0.04725, 0.026250003, 0.0, 0.04725, 0.015750004, 0.0, 0.057749998, 0.0052500046, 0.0, 0.036750004, 0.026250003, 0.0, 0.036750004, 0.036750004, 0.0, 0.036750004, 0.015750004, 0.0, 0.026250003, 0.0052500046, 0.0, 0.026250003, 0.036750004, 0.0, 0.026250003, 0.026250003, 0.0, 0.026250003, 0.015750004, 0.0, 0.036750004, 0.0052500046, 0.0, 0.015750004, 0.026250003, 0.0, 0.015750004, 0.036750004, 0.0, 0.015750004, 0.015750004, 0.0, 0.0052500046, 0.0052500046, 0.0, 0.0052500046, 0.036750004, 0.0, 0.0052500046, 0.026250003, 0.0, 0.0052500046, 0.015750004, 0.0, 0.015750004, 0.0052500046, 0.0, -0.005249995, 0.026250003, 0.0, -0.005249995, 0.036750004, 0.0, -0.005249995, 0.015750004, 0.0, -0.015749995, 0.0052500046, 0.0, -0.015749995, 0.036750004, 0.0, -0.015749995, 0.026250003, 0.0, -0.015749995, 0.015750004, 0.0, -0.005249995, 0.0052500046, 0.0, -0.026249994, 0.026250003, 0.0, -0.026249994, 0.036750004, 0.0, -0.026249994, 0.015750004, 0.0, -0.036749996, 0.0052500046, 0.0, -0.036749996, 0.036750004, 0.0, -0.036749996, 0.026250003, 0.0, -0.036749996, 0.015750004, 0.0, -0.026249994, 0.0052500046, 0.0, -0.04724999, 0.026250003, 0.0, -0.04724999, 0.036750004, 0.0, -0.04724999, 0.015750004, 0.0, -0.05774999, 0.0052500046, 0.0, -0.05774999, 0.036750004, 0.0, -0.05774999, 0.026250003, 0.0, -0.05774999, 0.015750004, 0.0, -0.04724999, 0.0052500046, 0.0, -0.068249986, 0.026250003, 0.0, -0.068249986, 0.036750004, 0.0, -0.068249986, 0.015750004, 0.0, -0.078749985, 0.0052500046, 0.0, -0.078749985, 0.036750004, 0.0, -0.078749985, 0.026250003, 0.0, -0.078749985, 0.015750004, 0.0, -0.068249986, 0.04725, 0.0, 0.07874999, 0.06824999, 0.0, 0.07874999, 0.07874999, 0.0, 0.07874999, 0.057749998, 0.0, 0.06824999, 0.04725, 0.0, 0.06824999, 0.07874999, 0.0, 0.06824999, 0.06824999, 0.0, 0.06824999, 0.057749998, 0.0, 0.07874999, 0.04725, 0.0, 0.057749998, 0.06824999, 0.0, 0.057749998, 0.07874999, 0.0, 0.057749998, 0.057749998, 0.0, 0.04725, 0.04725, 0.0, 0.04725, 0.07874999, 0.0, 0.04725, 0.06824999, 0.0, 0.04725, 0.057749998, 0.0, 0.057749998, 0.04725, 0.0, 0.036750004, 0.06824999, 0.0, 0.036750004, 0.07874999, 0.0, 0.036750004, 0.057749998, 0.0, 0.026250003, 0.04725, 0.0, 0.026250003, 0.07874999, 0.0, 0.026250003, 0.06824999, 0.0, 0.026250003, 0.057749998, 0.0, 0.036750004, 0.04725, 0.0, 0.015750004, 0.06824999, 0.0, 0.015750004, 0.07874999, 0.0, 0.015750004, 0.057749998, 0.0, 0.0052500046, 0.04725, 0.0, 0.0052500046, 0.07874999, 0.0, 0.0052500046, 0.06824999, 0.0, 0.0052500046, 0.057749998, 0.0, 0.015750004, 0.04725, 0.0, -0.005249995, 0.06824999, 0.0, -0.005249995, 0.07874999, 0.0, -0.005249995, 0.057749998, 0.0, -0.015749995, 0.04725, 0.0, -0.015749995, 0.07874999, 0.0, -0.015749995, 0.06824999, 0.0, -0.015749995, 0.057749998, 0.0, -0.005249995, 0.04725, 0.0, -0.026249994, 0.06824999, 0.0, -0.026249994, 0.07874999, 0.0, -0.026249994, 0.057749998, 0.0, -0.036749996, 0.04725, 0.0, -0.036749996, 0.07874999, 0.0, -0.036749996, 0.06824999, 0.0, -0.036749996, 0.057749998, 0.0, -0.026249994, 0.04725, 0.0, -0.04724999, 0.06824999, 0.0, -0.04724999, 0.07874999, 0.0, -0.04724999, 0.057749998, 0.0, -0.05774999, 0.04725, 0.0, -0.05774999, 0.07874999, 0.0, -0.05774999, 0.06824999, 0.0, -0.05774999, 0.057749998, 0.0, -0.04724999, 0.04725, 0.0, -0.068249986, 0.06824999, 0.0, -0.068249986, 0.07874999, 0.0, -0.068249986, 0.057749998, 0.0, -0.078749985, 0.04725, 0.0, -0.078749985, 0.07874999, 0.0, -0.078749985, 0.06824999, 0.0, -0.078749985, 0.057749998, 0.0, -0.068249986};
const byte PHASES_FOR_LINE[N_TRANS] = {14,6,20,15,3,10,27,24,20,14,29,22,4,14,31,5,16,14,28,14,25,6,26,4,0,2,14,25,3,18,7,21,3,7,18,21,0,14,2,25,25,26,6,4,16,28,14,14,4,31,14,5,20,29,14,22,3,27,10,24,14,20,6,15,31,0,2,28,21,25,22,3,9,11,14,3,26,0,29,17,9,12,15,29,20,26,23,18,27,31,2,9,31,6,3,5,31,3,6,5,27,2,31,9,20,23,26,18,9,15,12,29,26,29,0,17,9,14,11,3,21,22,25,3,31,2,0,28,3,9,0,5,25,22,31,14,14,19,10,11,0,27,5,25,15,19,10,5,26,21,31,26,2,6,29,17,6,0,10,13,6,10,0,13,2,29,6,17,26,31,21,26,15,10,19,5,0,5,27,25,14,10,19,11,25,31,22,14,3,0,9,5,21,3,17,8,11,5,24,17,0,10,22,11,19,5,26,27,4,6,17,3,16,27,16,25,25,23,2,14,29,5,26,10,29,26,5,10,25,2,23,14,16,16,27,25,4,17,6,3,19,26,5,27,0,22,10,11,11,24,5,17,21,17,3,8};
byte bufferToSend[N_TRANS + 2];
unsigned long millisFromLastButtonPress = 0;
byte buttonPresses = 0;
/* Array control functions */
void swichOffArray() {
bufferToSend[0] = 254; //start phases command
bufferToSend[N_TRANS + 1] = 253; //swap double buffer command (like a commit)
for (int i = 1; i < N_TRANS + 1; i += 1)
bufferToSend[i] = 32; //32 is the value for switching of the transducer
Serial2.write( bufferToSend, N_TRANS + 2 );
Serial2.flush();
}
void changeModulation(byte periods){
if (periods < 1) periods = 1;
else if(periods > 31) periods = 31;
Serial2.write( 0b10100000 | periods);
}
const float WAVELENGTH = 0.00865f;
const float PHASE_DIV = 32.0f;
void focusArrayAt(const float posX, const float posY, const float posZ) { //positions are in meters in respect to the center of the array
bufferToSend[0] = 254; //start phases command
bufferToSend[N_TRANS + 1] = 253; //swap double buffer command (i.e. commit)
for (int i = 1; i < N_TRANS+1; i += 1) {
const float diffX = TRANS_POS[(i-1)*3 + 0] - posX;
const float diffY = TRANS_POS[(i-1)*3 + 1] - posY;
const float diffZ = TRANS_POS[(i-1)*3 + 2] - posZ;
const float distInWavelengths = sqrt(diffX * diffX + diffY * diffY + diffZ * diffZ) / WAVELENGTH;
const byte phase = (byte)((ceil(distInWavelengths) - distInWavelengths) * PHASE_DIV);
bufferToSend[i] = phase;
}
Serial2.write( bufferToSend, N_TRANS + 2 );
Serial2.flush();
}
void makeBeeps(int nBeeps, int modulation=7){
if (nBeeps < 1) nBeeps = 1;
else if(nBeeps > 10) nBeeps = 10;
swichOffArray();
changeModulation( modulation );
for (int i = 0; i < nBeeps; i+=1 ){
focusArrayAt(0,0.1,0);
delay(250);
swichOffArray();
delay(250);
}
changeModulation( MOD_PERIODS_DEFAULT );
}
void sendPhasePattern(const byte* pattern){
Serial2.write( 254 );
Serial2.write( pattern, N_TRANS);
Serial2.write( 253 );
Serial2.flush();
}
/* Network functions*/
void configWifiAsAccessPoint(const char* ssidName){
Serial.println("Configuring as access point...");
WiFi.mode(WIFI_AP);
WiFi.softAP( ssidName, password );
Serial.println("Wait 100 ms for AP_START...");
delay(100);
Serial.println("Set softAPConfig");
IPAddress Ip(192, 168, 1, 1);
IPAddress NMask(255, 255, 255, 0);
WiFi.softAPConfig(Ip, Ip, NMask);
IPAddress myIP = WiFi.softAPIP();
Serial.print("AP IP address: ");
Serial.println(myIP);
}
boolean configWifiAsSlave(const byte lastIPDigit){
Serial.println("Configuring as station...");
WiFi.mode(WIFI_STA);
IPAddress local_IP(192, 168, 1, lastIPDigit);
IPAddress gateway(192, 168, 1, 1);
IPAddress subnet(255, 255, 255, 0);
IPAddress primaryDNS(8, 8, 8, 8); //optional
IPAddress secondaryDNS(8, 8, 4, 4); //optional
if (!WiFi.config(local_IP, gateway, subnet, primaryDNS, secondaryDNS)) {
Serial.println("STA Failed to configure");
}
Serial.println("Conecting to master");
WiFi.begin(ssidMaster, password);
for (int tries = 0; WiFi.status() != WL_CONNECTED; tries+= 1) {
delay(250);
Serial.print(".");
if (tries >= 4*5){ //after 5 seconds trying to connect
Serial.println("failure connecting to the master SSID");
return false;
}
}
IPAddress myIP = WiFi.localIP();
Serial.print("Station IP address: ");
Serial.println(myIP);
return true;
}
void setup() {
Serial.begin(230400); // this serial is for receiving commands and sending debug info to the computer
Serial2.begin(230400, SERIAL_8N1, 17, 16); //RX2 TX2 This serial communicates with the array
pinMode(BUTTON_PIN, INPUT_PULLUP);
Serial.println(ULTRATACT_VERSION);
Serial.println( ssid );
configWifiAsAccessPoint( ssid ); //start as access point with regular ssid
server.begin();
delay(200);
Serial.println("Switching off the array...");
makeBeeps( 1 );
}
int previousButton = HIGH;
int itersButtonHigh = 0;
bool randomMode = false;
unsigned long randomModeTriggerMillis = 0;
void loop() {
const unsigned long currentMillis = millis();
/* Button pres input */
if ( currentMillis - millisFromLastButtonPress > 1000 && buttonPresses > 0){
randomMode = false;
swichOffArray();
if (buttonPresses == 1){ //switch off the emitter
Serial.println("Button pressed once, switching off the array");
}else if (buttonPresses >= 2){ //try to connect to the master ssid,
const int lastIPDigit = 98 + buttonPresses; //with increasing IP numbers (.101 .102 ...)
Serial.print("Button pressed >=2, connecting with ip ");
Serial.println(lastIPDigit);
const boolean conectedToMaster = configWifiAsSlave(lastIPDigit);
if (conectedToMaster == false ){ //we failed connecting to the master, so we become the master
configWifiAsAccessPoint(ssidMaster);
makeBeeps( 1, 5 );
}else{
makeBeeps( buttonPresses );
}
}
delay(500);
buttonPresses = 0;
}
const int currentButtonState = digitalRead(BUTTON_PIN);
if (previousButton == HIGH && currentButtonState == LOW && itersButtonHigh > 100){ //when the button is pressed. last part is for avoid bouncing
buttonPresses += 1;
millisFromLastButtonPress = currentMillis;
}
if ( currentButtonState == HIGH && itersButtonHigh < 0x0FFF){
itersButtonHigh += 1;
}else{
itersButtonHigh = 0;
}
previousButton = currentButtonState;
/* Serial control, mainly to debug*/
if (Serial.available() > 1) {
byte letter = Serial.read();
Serial.read(); //read the newline
if (letter == 's') {
swichOffArray();
} else if (letter == 'f') {
focusArrayAt( 0, 0.1f, 0);
} else {
Serial.println("Yeah, I am still alive");
}
}
/* random mode*/
if (randomMode && randomModeTriggerMillis <= currentMillis){
randomModeTriggerMillis = currentMillis + random(20,150);
focusArrayAt( random(-40,40) / 1000.0f, random(90,110) / 1000.0f, random(-40,40) / 1000.0f);
}
/* Commands comming from HTTP */
WiFiClient client = server.available();
if (client) {
String request = client.readStringUntil('\r');
Serial.print( currentMillis );
Serial.print(' ');
Serial.println( request );
client.println("HTTP/1.1 200 OK\nContent-type:text/html\nConnection: close\n\n");
// /focus/x_y_z
// /off
// /mode/number number 1 to 4, mainly affects the modulation frequency
// /line at 10cm, 0 degrees
// /noise at 10cm, sparks (random mode)
int sep1 = request.indexOf('/');
if (sep1 == -1)
return;
//disable randomMode (noise pop...)
randomMode = false;
//command
if ((sep1 = request.indexOf("focus", sep1+1)) != -1){
const int sep2 = request.indexOf('/', sep1 + 1);
const int sep3 = request.indexOf('_', sep2 + 1);
const int sep4 = request.indexOf('_', sep3 + 1);
const int sep5 = request.indexOf(' ', sep4 + 1);
if (sep2 == -1 || sep3 == -1 || sep4 == -1 || sep5 == -1)
return;
const float posX = request.substring(sep2 + 1, sep3).toFloat();
const float posY = request.substring(sep3 + 1, sep4).toFloat();
const float posZ = request.substring(sep4 + 1, sep5).toFloat();
Serial.printf("Focusing at %f %f %f\n", posX, posY, posZ);
focusArrayAt( -posX, posY, posZ);
Serial.println("Focused");
client.printf("Focused at %f %f %f\n", posX, posY, posZ);
}else if((sep1 = request.indexOf("off", sep1+1)) != -1){
Serial.println("Switching off the array...");
swichOffArray();
}else if((sep1 = request.indexOf("mode", sep1+1)) != -1){
const int sep2 = request.indexOf('/', sep1 + 1);
const int sep3 = request.indexOf(' ', sep2 + 1);
const int mod = request.substring(sep2 + 1, sep3).toInt();
if (mod == 1){
changeModulation( MOD_PERIODS_DEFAULT );
}else if (mod == 2){
changeModulation( 7 );
}else if (mod == 3){
changeModulation( 15 );
}else if (mod == 4){
changeModulation( 8 );
}else{
changeModulation( MOD_PERIODS_DEFAULT );
}
}else if((sep1 = request.indexOf("line", sep1+1)) != -1){
Serial.println("Emitting a line...");
sendPhasePattern( PHASES_FOR_LINE );
}else if((sep1 = request.indexOf("sparks", sep1+1)) != -1){
Serial.println("Emitting noise...");
randomMode = true;
randomModeTriggerMillis = currentMillis;
}else if((sep1 = request.indexOf("version", sep1+1)) != -1){
Serial.println("Version is");
client.printf("Version is %s\n", ULTRATACT_VERSION);
}
client.stop();
}
}
