ESP8266 Community Forum

- Fri Mar 27, 2015 3:38 am #12712 Hello!

I made my own telemetry module for RC models, but i have a problem with developing a client software on PC. I tried do it in C# and aslo in Java, but in both case, when I try to get HTTP response, I get error like "Invalid http protocol" or something like this. So I think that something is with configuration of my ESP8266.

In browser it shows up in good way, but in Java or C# it don't work.

Firmware of my ESP is:
AT+GMR
0018000902-AI03


Can you please look at it?

Code: Select all#include <Wire.h>
#include <Adafruit_BMP085.h>
#include <SoftwareSerial.h>

Adafruit_BMP085 sensorBMP180;
SoftwareSerial esp(8,9);

float tempC;
float pressure;
float altitude;
float initAltitude;
float realAltitude;
byte responseCode;

void setup(){
Serial.begin(38400); //turn on serial monitor
esp.begin(38400);

sendCommand("AT+RST\r\n",2000); // reset module
sendCommand("AT+CWMODE=2\r\n",1000); // configure as access point 
sendCommand("AT+CIFSR\r\n",1000); // get ip address
sendCommand("AT+CIPMUX=1\r\n",1000); // configure for multiple connections
sendCommand("AT+CIPSERVER=1,80\r\n",1000); // turn on server on port 80
 
sensorBMP180.begin();   //initialize
initAltitude = sensorBMP180.readAltitude();
}
 
void loop() {
tempC = sensorBMP180.readTemperature();
pressure = sensorBMP180.readPressure();
altitude = sensorBMP180.readAltitude();
realAltitude = altitude - initAltitude;

if(esp.available()){
   
    if(esp.find("+IPD,")){
     delay(2000);
 
     int connectionId = esp.read()-48;
     
     String dataToSend = "<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n";
     dataToSend += "<telemetry-values>\n<temp>";
     String sVar = String(tempC);
 
     dataToSend += sVar;
     dataToSend += "</temp>\n";
 
     dataToSend += "<pressure>";
     sVar = String(pressure/100);
     dataToSend += sVar;
     dataToSend += "</pressure>\n";
 
     dataToSend+="<altitude>";
     sVar = String(altitude);
     dataToSend += sVar;
     dataToSend += "</altitude>\n";
 
     dataToSend+="<alt-above-ground>";
     sVar = String(realAltitude);
     dataToSend += sVar;
     dataToSend += "</alt-above-ground>\n</telemetry-values>";
     
     String cmdCIPSEND = "AT+CIPSEND=";
     cmdCIPSEND += connectionId;
     cmdCIPSEND += ",";
     cmdCIPSEND +=dataToSend.length();
     cmdCIPSEND +="\r\n";
   
     sendCommand(cmdCIPSEND,2000);
     sendCommand(dataToSend,2000);

     String closeCommand = "AT+CIPCLOSE=";
     closeCommand+=connectionId;
     closeCommand+="\r\n";
     
     sendCommand(closeCommand,3000);
     }
  }
}

String sendCommand(String command, const int timeout){
    String response = "";
   
    esp.print(command);
   
    long int time = millis();
   
    while( (time+timeout) > millis()){
      while(esp.available()){
        char c = esp.read();
        response+=c;
      } 
    }
   Serial.print(response);   
    return response;
}


- Fri Mar 27, 2015 9:36 am #12739 Ok! So, I get a response from ESP to my client. I had to send a HTTP header with my data. But another problem, I can send only text (and html? I didn't try), but I can't send an XML file. I tried to write to HTTP header Content-type: text/xml, but it didn't work.

EDIT: Nevermind, it's working now! I did silly mistake in my code.