how to get input value from ultrasonic sensor on copper web application (coap protocol)

Question

i can't use 'GET' in copper.I know that ultrasonic sensors can't be set like lights (binary data). but I just want to get a description of the if parameter I've made

   if (jarak < 50) {
    Serial.println ("jarak Aman ");
    
    }
   
   else {
    Serial.println ("harus diisi");

this is the full code

#include <ESP8266WiFi.h>
#include <coap_server.h>
#include <Ultrasonic.h>


#define triggerPin  D8
#define echoPin     D7

char * duration, jarak;

coapServer coap;

//WiFi connection info
const char* ssid = "ZTE-d17d4e";
const char* password = "amatapit";

bool LEDSTATE;

//Setup


void setup() {
  yield();


  pinMode(triggerPin, OUTPUT);
  pinMode(echoPin, INPUT);
  //serial begin
  Serial.begin(115200);

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

  // Connect to WiFi network
  Serial.println();
  Serial.println();
  Serial.print("Connecting to ");
  Serial.println(ssid);
  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED) {
    //delay(500);
    yield();
    Serial.print(".");
  }
  Serial.println("");
  Serial.println("WiFi connected");
  // Print the IP address
  Serial.println(WiFi.localIP());

  
  // LED State
  pinMode(16, OUTPUT);
  digitalWrite(16, HIGH);
  LEDSTATE = true;

  pinMode(5, OUTPUT);
  digitalWrite(5, HIGH);
  //LEDSTATE = true;




  // add server url endpoints.
  // can add multiple endpoint urls.

  coap.server(callback_light, "light");
  coap.server(callback_sensor, "sensor");

  // start coap server/client
  coap.start();
  // coap.start(5683);
}

void loop() {
  coap.loop();
  delay(1000);

long duration, jarak;
   
  digitalWrite(triggerPin, LOW);
  delayMicroseconds(2); 
  digitalWrite(triggerPin, HIGH);
  delayMicroseconds(10); 
  digitalWrite(triggerPin, LOW);
  duration = pulseIn(echoPin, HIGH);
   //inches = microsecondsToInches(duration);
//    cm = microsecondsToCentimeters(duration);
   jarak = duration/29/2;
   Serial.print("Jarak :");
   Serial.println(jarak);
   Serial.print(" cm");
   Serial.println("");
   if (jarak < 50) {
    Serial.println ("jarak Aman ");
    
    }
   
   else {
    Serial.println ("harus diisi");
   }
   
  delay(500);


}



// CoAP server endpoint URL
void callback_light(coapPacket *packet, IPAddress ip, int port,int obs) {
  Serial.println("light");

  // send response
  char p[packet->payloadlen + 1];
  memcpy(p, packet->payload, packet->payloadlen);
  p[packet->payloadlen] = NULL;
  Serial.println(p);

  String message(p);

  if (message.equals("0"))
  {
    digitalWrite(16,LOW);
    Serial.println("Lampu Mati");
  }
  else if (message.equals("1"))
  {
    digitalWrite(16,HIGH);
    Serial.println("Lampu Menyala");
  } 
  char *light = (digitalRead(16) > 0)? ((char *) "Lampu Menyala:") :((char *) "Lampu Mati");
  
   //coap.sendResponse(packet, ip, port, light);
   if(obs==1)
    coap.sendResponse(light);
   else
    coap.sendResponse(ip,port,light);
 
}


void callback_sensor(coapPacket *packet, IPAddress ip, int port,int obs) {
  Serial.println("sensor");

// send response
  char p[packet->payloadlen + 1];
  memcpy(p, packet->payload, packet->payloadlen);
  p[packet->payloadlen] = NULL;
  Serial.println(p);

  String message(p);
 if (message.equals("1"))
  {
   // digitalWrite(16,LOW);
    Serial.println(jarak);
  }
  else if (message.equals("2"))
  {
   // digitalWrite(16,HIGH);
    Serial.println(jarak);
  } 


  
  char *sensor = ((jarak) > 0)? ((char *) "Nyala nih") :((char *) "Mati");
 
  
  
   //coap.sendResponse(packet, ip, port, sensor);
   if(obs==1)
    coap.sendResponse(sensor);
   else
    coap.sendResponse(ip,port,sensor);
}#include <ESP8266WiFi.h>
#include <coap_server.h>
#include <Ultrasonic.h>


#define triggerPin  D8
#define echoPin     D7

char * duration, jarak;

coapServer coap;

//WiFi connection info
const char* ssid = "ZTE-d17d4e";
const char* password = "amatapit";

bool LEDSTATE;

//Setup


void setup() {
  yield();


  pinMode(triggerPin, OUTPUT);
  pinMode(echoPin, INPUT);
  //serial begin
  Serial.begin(115200);

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

  // Connect to WiFi network
  Serial.println();
  Serial.println();
  Serial.print("Connecting to ");
  Serial.println(ssid);
  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED) {
    //delay(500);
    yield();
    Serial.print(".");
  }
  Serial.println("");
  Serial.println("WiFi connected");
  // Print the IP address
  Serial.println(WiFi.localIP());

  
  // LED State
  pinMode(16, OUTPUT);
  digitalWrite(16, HIGH);
  LEDSTATE = true;

  pinMode(5, OUTPUT);
  digitalWrite(5, HIGH);
  //LEDSTATE = true;




  // add server url endpoints.
  // can add multiple endpoint urls.

  coap.server(callback_light, "light");
  coap.server(callback_sensor, "sensor");

  // start coap server/client
  coap.start();
  // coap.start(5683);
}

void loop() {
  coap.loop();
  delay(1000);

long duration, jarak;
   
  digitalWrite(triggerPin, LOW);
  delayMicroseconds(2); 
  digitalWrite(triggerPin, HIGH);
  delayMicroseconds(10); 
  digitalWrite(triggerPin, LOW);
  duration = pulseIn(echoPin, HIGH);
   //inches = microsecondsToInches(duration);
//    cm = microsecondsToCentimeters(duration);
   jarak = duration/29/2;
   Serial.print("Jarak :");
   Serial.println(jarak);
   Serial.print(" cm");
   Serial.println("");
   if (jarak < 50) {
    Serial.println ("jarak Aman ");
    
    }
   
   else {
    Serial.println ("harus diisi");
   }
   
  delay(500);


}



// CoAP server endpoint URL
void callback_light(coapPacket *packet, IPAddress ip, int port,int obs) {
  Serial.println("light");

  // send response
  char p[packet->payloadlen + 1];
  memcpy(p, packet->payload, packet->payloadlen);
  p[packet->payloadlen] = NULL;
  Serial.println(p);

  String message(p);

  if (message.equals("0"))
  {
    digitalWrite(16,LOW);
    Serial.println("Lampu Mati");
  }
  else if (message.equals("1"))
  {
    digitalWrite(16,HIGH);
    Serial.println("Lampu Menyala");
  } 
  char *light = (digitalRead(16) > 0)? ((char *) "Lampu Menyala:") :((char *) "Lampu Mati");
  
   //coap.sendResponse(packet, ip, port, light);
   if(obs==1)
    coap.sendResponse(light);
   else
    coap.sendResponse(ip,port,light);
 
}


void callback_sensor(coapPacket *packet, IPAddress ip, int port,int obs) {
  Serial.println("sensor");

// send response
  char p[packet->payloadlen + 1];
  memcpy(p, packet->payload, packet->payloadlen);
  p[packet->payloadlen] = NULL;
  Serial.println(p);

  String message(p);
 if (message.equals("1"))
  {
   // digitalWrite(16,LOW);
    Serial.println(jarak);
  }
  else if (message.equals("2"))
  {
   // digitalWrite(16,HIGH);
    Serial.println(jarak);
  } 


  
  char *sensor = ((jarak) > 0)? ((char *) "Nyala nih") :((char *) "Mati");
 
  
  
   //coap.sendResponse(packet, ip, port, sensor);
   if(obs==1)
    coap.sendResponse(sensor);
   else
    coap.sendResponse(ip,port,sensor);
}

Answer 1

To analyse the issue, you may also try other clients, eg libcoap or Californium . If that still results in trouble, a IP capture helps to understand the case.

Or, is your question more about your server-side code than about coap? Then some logs from your server may help to understand, how it works and to find the issue there.