I bought an Ethernet shield and I wrote a code, but I saw that there is .available() method. I don't know where to use it. So guys, do you know where and when I should use it? Here is my sample code:
#include <Ethernet.h>
#include <SPI.h>
byte mac[] = {0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED};
IPAddress ip(192, 168, 1, 107);
EthernetServer server = EthernetServer(80);
void setup() {
Serial.begin(9600);
Ethernet.begin(mac, ip);
server.begin();
}
void loop() {
EthernetClient client = server.available();
if(client) {
if(client.available()) {
char c = client.read();
Serial.print(c);
}
}
}
Thank you.
Client.available() returns the number of bytes that a client (remote client) may have written. If you're writing an HTTP server, the first client data would be: GET /URL HTTP/1.0.
You then write back to that client with Client.write(). For example:
c.write("HTTP/1.0 200 OK")
Related
I'm want to send data using ethernet on https, i'm read exmpale EthernetHttpClient_SSL but not work. How to Solve this?
This my code:
char server = "https://jsonplaceholder.typicode.com";
#define SSL_PORT 443
int port = 8080;
#include <SPI.h>
#include <Ethernet.h>
#include <EthernetHttpClient_SSL.h>
byte mac[] = { 0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED };
EthernetClient client;
EthernetHttpClient httpClient(client, server, SSL_PORT);
void setup() {
Serial.begin(115200);
while (!Serial) {
;
}
Ethernet.init(5);
if (Ethernet.begin(mac) == 0) {
Serial.println("Failed to configure Ethernet using DHCP");
for (;;)
;
}
}
void loop() {
Serial.println("making GET request");
httpClient.get("/posts/1");
int statusCode = httpClient.responseStatusCode();
String response = httpClient.responseBody();
Serial.print("Status code: ");
Serial.println(statusCode);
// Serial.print("Response: ");
// Serial.println(response);
Serial.println("Wait five seconds");
delay(5000);
}
I'm get respon code: -2
Is there a simple and easy library to access https using Ethernet?
If i'm access local server "localhost" success, i'm use client.print()
I have a uvicorn fastapi server that runs a file on port 8000 at address "example.com/sub/subsub" that returns either a 0 or a 1.
I also have an arduino running that tries to connect to this url and work with this binary value. I can't figure out why my code isn't working. The arduino keeps printing '0' to indicate that the client is not available, while my server keeps printing "Invalid HTTP request received". Can anyone help me as to what goes wrong here?
#include <SPI.h>
#include <Ethernet.h>
#include <HttpClient.h>
byte mac[] = { 0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED };
IPAddress ip(192,168,1,y);
byte serverIP[] = {x, x, x, x};
EthernetClient client;
void setup() {
Serial.begin(9600);
Ethernet.begin(mac, ip);
delay(1000);
int res = client.connect(serverIP,8000);
Serial.println(res);
}
void loop(){
if (client.connected() == true) {
Serial.println("connected:)");
client.println("GET /sub/subsub HTTP/1.0");
if (client.available()) {
char c = client.read();
Serial.println(c);
} else {
Serial.println(client.available());
}
} else {
Serial.println("connection failed in loop: diconnecting...");
client.stop();
delay(1000);
client.connect(serverIP,8000);
}
delay(5000);
}
Simple Ethernet communication between two Arduino boards. I used two Arduino UNO boards, Two Arduino Ethernet Shields.
Here is my Server Code
//Server
#include <SPI.h>
#include <Ethernet.h>
// network configuration. gateway and subnet are optional.
// the media access control (ethernet hardware) address for the shield:
byte mac[] = { 0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED };
//the IP address for the shield:
byte ip[] = { 192,168,1,180 };
// the router's gateway address:
byte gateway[] = { 192, 168, 1, 1 };
// the subnet:
byte subnet[] = { 255, 255, 255, 0 };
EthernetServer server = EthernetServer(10001);
void setup()
{
// initialize the ethernet device
Ethernet.begin(mac, ip, gateway, subnet);
// start listening for clients
server.begin();
}
void loop()
{
// if an incoming client connects, there will be bytes available to read:
EthernetClient client = server.available();
if (client == true) {
// read bytes from the incoming client and write them back
// to any clients connected to the server:
server.write(client.read());
}
}
Here is my Client Code
//Client
#include <Ethernet.h>
#include <SPI.h>
byte mac[] = {0xDE,0xAD,0xBE,0xEF,0xFE,0xEC};
IPAddress ip(192,168,1,177);
IPAddress server(192,168,1,180);
EthernetClient client(10001);
void setup()
{
Ethernet.begin(mac, ip);
Serial.begin(9600);
delay(1000);
Serial.println("connecting...");
if (client.connect(server, 10001)) {
Serial.println("connected");
client.println("GET /search?q=arduino HTTP/1.0");
client.println();
} else {
Serial.println("connection failed");
}
}
void loop()
{
if (client.available()) {
char c = client.read();
Serial.print(c);
}
if (!client.connected()) {
Serial.println();
Serial.println("disconnecting.");
client.stop();
for(;;)
;
}
}
I input those two codes to two Arduino boards. Wiring and other connection are correct and reliable.
But I got this output from client serial monitor
connecting...
connection failed
disconnecting.
According to my view, error may happen in client code. Can you help me to find the error?
How do I reference the address of the DNS serverIP, subnetIP, gatewayIP ?
As you can see from teh code below, I have tried but all I geet is the following error,
"class EthernetClass has no member called subnet".
#include <SPI.h>
#include <Ethernet.h>
// Network configuration
// Note : DNS server, gateway and subnet are optional.
byte mac[] = { 0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED };
// The IP address of Arduino Ethernet shield.
IPAddress myLocalIP(192, 168, 100, 2);
// The DNS server IP.
IPAddress dnsServer(192, 168, 100, 1);
// The router's gateway IP address.
IPAddress gateway(192, 168, 0, 1);
// the subnet:
IPAddress subnet(255, 255, 255, 0);
void setup() {
Serial.begin(9600);
Ethernet.begin(mac, myLocalIP, subnet); // Initialize the ethernet device
// Ethernet.begin(mac, ip, dnServer, gateway, subnet);
Serial.print("Local IP = "); // Print out the IP address of the shield.
Serial.println(Ethernet.localIP());
Serial.print("DNS Address = ");
Serial.println(Ethernet.IPAddress.subnet() );
} // End setup.
void loop()
{
} // End loop.
Wallek876, Thank you for the info.
I have added the others as well, namely subnetMask, gatewayIP however when I used the documented method (as per your link) to print the MAC address - namely - Ethernet.MACAddress(macBuffer); I got an error.
The documented code - (copied from the documentation) is as follows;
#include <SPI.h>
#include <Ethernet.h>
byte mac[] = {0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED};
IPAddress ip(10, 0, 0, 177);
void setup() {
Serial.begin(9600);
while (!Serial) {
; // wait for serial port to connect. Needed for native USB port only
}
Ethernet.begin(mac, ip);
byte macBuffer[6]; // create a buffer to hold the MAC address
Ethernet.MACAddress(macBuffer); // fill the buffer
Serial.print("The MAC address is: ");
for (byte octet = 0; octet < 6; octet++) {
Serial.print(macBuffer[octet], HEX);
if (octet < 5) {
Serial.print('-');
}
}
}
void loop () {}
The error being on line Ethernet.MACAddress(macBuffer);
MACAddress not defined.
I tried several other solutions all to no avail - so some suggetions would be greatefully received.
I am using knolleary library to connect the Arduino UNO board to MQTT server. For broker I am using test.mosquitto.org (85.119.83.194) but I am not able to connect.
Here is my code:
/*
Basic MQTT example
- connects to an MQTT server
- publishes "hello world" to the topic "outTopic"
- subscribes to the topic "inTopic"
*/
#include <SPI.h>
#include <Ethernet.h>
#include <PubSubClient.h>
// Update these with values suitable for your network.
byte mac[] = { 0xDE, 0xED, 0xBA, 0xFE, 0xFE, 0xED };
byte server[] = { 10, 2, 63, 123};
byte ip[] = { 85, 119, 83, 194 };
void callback(char* topic, byte* payload, unsigned int length) {
// handle message arrived
Serial.println("Message received");
}
EthernetClient ethClient;
PubSubClient client(server, 1883, callback, ethClient);
void setup()
{
Ethernet.begin(mac, ip);
Serial.begin(9600);
Serial.println("Ethernet Begin");
if (client.connect("arduinoClient")) {
Serial.println("Client connected");
client.subscribe("/notification/turnlighton");
}
else{
Serial.println("Client not connected");
}
}
void loop()
{
client.loop();
}
client.connect("arduinoClient") return false and "Client not connected" message is printed Serial Monitor.
I am not sure what should be the value of
byte server[] = { 10, 2, 63, 123};
As an alternate I also tried to connect to the Really Simple Message Broker (RSMB) in intranet. Still I get same message.
Can any one help in here?
Thanks in advance
SRS
You have it around the wrong way;
byte server[] is your mqtt server's ip address, in your case test.mosquitto.org (85.119.83.194)
byte ip[] is the static ip address you want the arduino to have on your network.
The other thing to check is that you can connect using a cli client to test.mosquitto.org as it is sometimes down I find.
Have a look at my temperature publishing code, https://github.com/matbor/arduinoTemps2mqtt it might give you a few hints as it was modified from that original example that comes with PubSubClient. In my one I just have the arduino running off DHCP.