Porting Arduino Sketch from Ethernet to Wifi

Question

I have a sketch working with an Arduino Uno and an Ethernet Shield - and it's working fine. Now I've gotten my hands on some Arduino Uno WiFi, and I want to port the sketch from ethernet to wifi - but I've run into a wall now. Most of the guide/FAQ/help I can find is for a WiFi Shield, and not a WiFi Arduino, so I'm stuck here.

Below is my (original Ethernet) code. I can post my somewhat modified Wifi code, but I can't even compile it without errors.

//  Hartmann fugtighedsmåler v 0.1
//  Lavet af Jan Andreasen
//  Skriver til DB på FDKTO517

#include <Ethernet.h>
#include <SPI.h>
#include <DHT.h>
#define DHTPIN 2 // Siger sig selv
#define DHTTYPE DHT11 // Typen af sensor. 

float h = 0;
float t = 0;
byte mac[] = {0x00, 0xAA, 0xBB, 0xCC, 0xDE, 0x02}; // Macadresse på kortet
IPAddress server(10,16,9,229); // Server adressen på SQL'en

EthernetClient client;
DHT dht(DHTPIN, DHTTYPE);

void setup() {
  Serial.begin(9600);
  Serial.println("Starting...");
  Ethernet.begin(mac);
  dht.begin();
}

void loop() {
  readTempHum();
  delay(300000); // Loop timer i millis - 5 minutter
}

void get_request(float t, float h) {
  Serial.println("Connecting to Client...");
  if (client.connect(server, 10080)) {
    Serial.println("--> connection ok\n");
    client.print("GET /test.php?");
    // Placering af PHP script til upload til DB
    client.print("t="); // Temp
    client.print(t); 
    client.print("&h="); // Fugtighed
    client.print(h);
    client.println(" HTTP/1.1");
    client.print( "Host: " );
    client.println(server);
    client.println("Connection: close");
    client.println();
    client.println();
    client.stop();
    Serial.println("--> finished transmission\n");
  } else {
    Serial.println("--> connection failed\n");
  }
}

void readTempHum() {
  h = dht.readHumidity();
  t = dht.readTemperature();
  {
    Serial.print("Humidity: ");
    Serial.print(h);
    Serial.print("%\t");
    Serial.print("Temperature:");
    Serial.print(t);
    Serial.println("*C");
    get_request(t,h);
  }
}

I've also posted this on the Arduino Forum. I'm sorry if you see my double-post, and I'll post the solution to my problem here as well.

New sketch:

#include <Wire.h>
#include <UnoWiFiDevEd.h>
#include <DHT.h>
#define DHTPIN 4
#define DHTTYPE DHT11

float h = 0;
float t = 0;

DHT dht(DHTPIN, DHTTYPE);

void setup() {

  const char* connector = "rest";
  const char* server = "10.16.9.229";
  const char* method = "GET";
  const char* resource = "/test.php?t=";

  Serial.begin(9600);
  Ciao.begin();
  dht.begin();

  pinMode(2, INPUT);

  delay(10000);
}

void loop() {

  readTempHum();
//  doRequest(connector, server, resource, method);
  delay(300000);
}

void doRequest(const char* conn, const char* server, const char* command, const char* method, float t, float h){
  CiaoData data = Ciao.write(conn, server, command, method);
}

void readTempHum() {
  h = dht.readHumidity();
  t = dht.readTemperature();
  const char* connector = "rest";
  const char* server = "10.16.9.229";
  const char* method = "GET";
  const char* resource = "/test.php?t=";

    {
    doRequest(connector, server, resource, method,t,h);
    }
  }

Now, I've ran into a new problem. The value from the sensor (t and h) are supposed to be output in the HTTP/GET command like this: test.php?t=1&h=2 But I can't seem to make that work. If I try to define the resource as this const char* resource = "/test.php?t="+t+"&h="+h; I get an error (obviously), but if I try to declare it as a string, I the same error again.

Error:

HumidSQL3_Wifi_master:24: error: invalid operands of types 'const char [13]' and 'float' to binary 'operator+'

const char* resource = "/test.php?t="+t+"&h="+h;

Now, I hope that some of you could help me out a bit here :/

Answer 1

If it is the Arduino.org Arduino UNO WiFi Developer Edition, then use WiFi Link with UNO WiFi Serial1 library

Answer 2

Okay - so I made it work. I had to start from scratch, and with the help from Juraj (I'll accept your answer as well) it works now.

Below are the final sketch ("final", as the DHT11 sensor only were for testing purpose, as a proof-of-concept)

//  Hartmann fugtighedsmåler v 0.2.2
//  Lavet af Jan Andreasen
//  Skriver til DB på FDKTO517
//  WiFi udgave, testversion


#include <Wire.h>
#include <UnoWiFiDevEd.h>
#include <DHT.h>
#define DHTPIN 4
#define DHTTYPE DHT11
#define CONNECTOR "rest"
#define SERVER_ADDR "10.16.9.229"


float h = 0;
float t = 0;

DHT dht(DHTPIN, DHTTYPE);

void setup() {

  Serial.begin(9600);
  Ciao.begin();
  dht.begin();

  pinMode(2, INPUT); // I'm not sure if this is required, just saw it now

  delay(10000); // A 10 second delay from start to initialization
}

void loop() {

  readTempHum();
  delay(300000); // A 5 minute delay between measurements
}

void readTempHum() {
  h = dht.readHumidity(); // Reads the humidity from sensor
  t = dht.readTemperature(); // Reads the temperature from sensor
  String uri = "/test.php?t="; // URL to the PHP-file
  uri += t;  // Insert the T-value
  uri +="&h=";
  uri += h; // Insert the H-value

  CiaoData data = Ciao.write(CONNECTOR, SERVER_ADDR, uri); // Make a basic HTTP request to the specified server using REST and the URL specified above
  }

Maybe not the prettiest code you've seen, however, it works now.