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I2C (Wire)
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WiFiEsp
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FreeRTOS Tips
WiFiEsp
This library ported bportaluri's WiFiEsp library for GR-ROSE. Refer to the GitHub README for the API specification. To use, specify #include #include <WiFiEsp.h>
. Only the client and server sample programs are listed.
Sample Program
Get data from arduino.cc as WebClient.
#include <Arduino.h>
#include <WiFiEsp.h>
char ssid[] = "Twim"; // your network SSID (name)
char pass[] = "12345678"; // your network password
int status = WL_IDLE_STATUS; // the Wifi radio's status
char server[] = "arduino.cc";
// Initialize the Ethernet client object
WiFiEspClient client;
void printWifiStatus();
void setup()
{
// initialize serial for debugging
Serial.begin(115200);
// initialize serial for ESP module
Serial6.begin(115200);
// initialize ESP module
WiFi.init(&Serial6);
// check for the presence of the shield
if (WiFi.status() == WL_NO_SHIELD) {
Serial.println("WiFi shield not present");
// don't continue
while (true);
}
// attempt to connect to WiFi network
while ( status != WL_CONNECTED) {
Serial.print("Attempting to connect to WPA SSID: ");
Serial.println(ssid);
// Connect to WPA/WPA2 network
status = WiFi.begin(ssid, pass);
}
// you're connected now, so print out the data
Serial.println("You're connected to the network");
printWifiStatus();
Serial.println();
Serial.println("Starting connection to server...");
// if you get a connection, report back via serial
if (client.connect(server, 80)) {
Serial.println("Connected to server");
// Make a HTTP request
client.println("GET /asciilogo.txt HTTP/1.1");
client.println("Host: arduino.cc");
client.println("Connection: close");
client.println();
}
while(!client.available()); // wait for 1st response from server
}
void loop()
{
// if there are incoming bytes available
// from the server, read them and print them
while (client.available()) {
char c = client.read();
Serial.write(c);
}
// if the server's disconnected, stop the client
if (!client.connected()) {
Serial.println();
Serial.println("Disconnecting from server...");
client.stop();
// do nothing forevermore
while (true);
}
}
void printWifiStatus()
{
// print the SSID of the network you're attached to
Serial.print("SSID: ");
Serial.println(WiFi.SSID());
// print your WiFi shield's IP address
IPAddress ip = WiFi.localIP();
Serial.print("IP Address: ");
Serial.println(ip);
// print the received signal strength
long rssi = WiFi.RSSI();
Serial.print("Signal strength (RSSI):");
Serial.print(rssi);
Serial.println(" dBm");
}
GR-ROSE becomes an access point, and when connected, it returns the value of pin A0 as WebServer.
#include <Arduino.h>
#include <WiFiEsp.h>
char ssid[] = "TwimEsp"; // your network SSID (name)
char pass[] = "12345678"; // your network password
int status = WL_IDLE_STATUS; // the Wifi radio's status
int reqCount = 0; // number of requests received
WiFiEspServer server(80);
// use a ring buffer to increase speed and reduce memory allocation
RingBuffer buf(8);
void sendHttpResponse(WiFiEspClient client);
void printWifiStatus();
void setup()
{
Serial.begin(115200); // initialize serial for debugging
Serial6.begin(115200); // initialize serial for ESP module
WiFi.init(&Serial6); // initialize ESP module
// check for the presence of the shield
if (WiFi.status() == WL_NO_SHIELD) {
Serial.println("WiFi shield not present");
while (true); // don't continue
}
Serial.print("Attempting to start AP ");
Serial.println(ssid);
// uncomment these two lines if you want to set the IP address of the AP
//IPAddress localIp(192, 168, 111, 111);
//WiFi.configAP(localIp);
// start access point
status = WiFi.beginAP(ssid, 10, pass, ENC_TYPE_WPA2_PSK);
Serial.println("Access point started");
printWifiStatus();
// start the web server on port 80
server.begin();
Serial.println("Server started");
}
void loop()
{
WiFiEspClient client = server.available(); // listen for incoming clients
if (client) { // if you get a client,
Serial.println("New client"); // print a message out the serial port
buf.init(); // initialize the circular buffer
while (client.connected()) { // loop while the client's connected
if (client.available()) { // if there's bytes to read from the client,
char c = client.read(); // read a byte, then
buf.push(c); // push it to the ring buffer
// you got two newline characters in a row
// that's the end of the HTTP request, so send a response
if (buf.endsWith("\r\n\r\n")) {
sendHttpResponse(client);
break;
}
}
}
// give the web browser time to receive the data
delay(10);
// close the connection
client.stop();
Serial.println("Client disconnected");
}
}
void sendHttpResponse(WiFiEspClient client)
{
client.print(
"HTTP/1.1 200 OK\r\n"
"Content-Type: text/html\r\n"
"Connection: close\r\n" // the connection will be closed after completion of the response
"Refresh: 20\r\n" // refresh the page automatically every 20 sec
"\r\n");
client.print("\r\n");
client.print("\r\n");
client.print("<h1>Hello World!</h1>\r\n");
client.print("Requests received: ");
client.print(++reqCount);
client.print("
\r\n");
client.print("Analog input A0: ");
client.print(analogRead(0));
client.print("
\r\n");
client.print("\r\n");
}
void printWifiStatus()
{
// print your WiFi shield's IP address
IPAddress ip = WiFi.localIP();
Serial.print("IP Address: ");
Serial.println(ip);
// print where to go in the browser
Serial.println();
Serial.print("To see this page in action, connect to ");
Serial.print(ssid);
Serial.print(" and open a browser to http://");
Serial.println(ip);
Serial.println();
}