Hello,
does anyone have a code thing to do a hello world to a local mqtt server?
i've been searching for 2 days now with no luck on this little board.
thanks a ton!
Have you looked at the PubSubClient library ?
yes, but can't get any of them to work. complete and udder newb here. i've been using pi zeros to transmit bme280 sensor data to my local mqtt server i setup last week. before that i've been using rrdtool to log sensor data and crontab jobs to update a local website for tacking house tempatures and stuff. but i'm getting annoyed at pi for randomly freezing. figured arduino that have single propose would do a better job.
What are the symptoms of them failing ?
they all have import ethernet, i'm on wireless
#include <SPI.h>
#include <WiFiNINA.h>
#include <PubSubClient.h>
WiFiClient espClient;
PubSubClient client(espClient);
#include "arduino_secrets.h"
///////please enter your sensitive data in the Secret tab/arduino_secrets.h
char ssid[] = SECRET_SSID; // your network SSID (name)
char pass[] = SECRET_PASS; // your network password (use for WPA, or use as key for WEP)
int status = WL_IDLE_STATUS; // the WiFi radio's status
void setup() {
//Initialize serial and wait for port to open:
Serial.begin(9600);
while (!Serial) {
; // wait for serial port to connect. Needed for native USB port only
}
// check for the WiFi module:
if (WiFi.status() == WL_NO_MODULE) {
Serial.println("Communication with WiFi module failed!");
// don't continue
while (true);
}
String fv = WiFi.firmwareVersion();
if (fv < WIFI_FIRMWARE_LATEST_VERSION) {
Serial.println("Please upgrade the firmware");
}
// 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);
// wait 10 seconds for connection:
delay(10000);
}
// you're connected now, so print out the data:
}
void loop() {
// check the network connection once every 10 seconds:
delay(15000);
}
void reconnect() {
// Loop until we're reconnected
while (!client.connected()) {
Serial.print("Attempting MQTT connection...");
// Create a random client ID
String clientId = "ArduinoSensor1";
clientId += String(random(0xffff), HEX);
// Attempt to connect
if (client.connect(clientId.c_str())) {
Serial.println("connected");
// Once connected, publish an announcement...
client.publish("ArduinoSensor1", "hello world");
// ... and resubscribe
client.subscribe("greenBottles/#");
} else {
Serial.print("failed, rc=");
Serial.print(client.state());
Serial.println(" try again in 5 seconds");
// Wait 5 seconds before retrying
delay(5000);
}
}
}
here is what i'm trying, but don't see anything in the debug screen. i don't even know if i'm doing this right.
Please start by posting your code in the recommended way to make it easier to copy for examination
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Which Arduino board are you using ?
i'm using an arduino nano 33 iot
the code a posted has no errors, it's a example from the "WiFININA" libary. i've been trying to assemble the mqtt stuff to it so i can get the debug window in node red to see "hello world"
more of a prof of concept before i remove one of my sensors and try playing with that.
Welcome to the forum.
One issue is that you are not setting a MQTT server/broker. Have a look at the PubSubClient examples.
client.setServer(server, 1883); // server is IP address of your MQTT broker
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