MQTT: Arduino Publish di callback - Revision history

Onnowpurbo at 09:06, 25 December 2018

2018-12-25T09:06:02Z

← Older revision		Revision as of 09:06, 25 December 2018
Line 59:		Line 59:
	client.loop();		client.loop();
	}		}


			==Pranala Menarik==

			* [[Arduino]]
			* [[MQTT]]

Onnowpurbo at 09:34, 11 May 2018

2018-05-11T09:34:40Z

← Older revision	Revision as of 09:34, 11 May 2018
Line 1:	Line 1:
		/*
		Publishing in the callback

		- connects to an MQTT server
		- subscribes to the topic "inTopic"
		- when a message is received, republishes it to "outTopic"

		This example shows how to publish messages within the
		callback function. The callback function header needs to
		be declared before the PubSubClient constructor and the
		actual callback defined afterwards.
		This ensures the client reference in the callback function
		is valid.

		*/

		#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 };
		IPAddress ip(192, 168, 0, 4);
		IPAddress server(192, 168, 0, 100);

		// Callback function header
		void callback(char* topic, byte* payload, unsigned int length);

		EthernetClient ethClient;
		PubSubClient client(server, 1883, callback, ethClient);

		// Callback function
		void callback(char* topic, byte* payload, unsigned int length) {
		// In order to republish this payload, a copy must be made
		// as the orignal payload buffer will be overwritten whilst
		// constructing the PUBLISH packet.

		// Allocate the correct amount of memory for the payload copy
		byte* p = (byte*)malloc(length);
		// Copy the payload to the new buffer
		memcpy(p,payload,length);
		client.publish("outTopic", p, length);
		// Free the memory
		free(p);
		}

		void setup()
		{

		Ethernet.begin(mac, ip);
		if (client.connect("arduinoClient")) {
		client.publish("outTopic","hello world");
		client.subscribe("inTopic");
		}
		}

		void loop()
		{
		client.loop();
		}

Onnowpurbo: Blanked the page

2018-05-11T09:31:01Z

Blanked the page

← Older revision		Revision as of 09:31, 11 May 2018
Line 1:		Line 1:
	/*
	~~Publishing in the callback~~

	~~- connects to an MQTT server~~
	~~- subscribes to the topic "inTopic"~~
	~~- when a message is received, republishes it to "outTopic"~~

	~~This example shows how to publish messages within the~~
	~~callback function. The callback function header needs to~~
	~~be declared before the PubSubClient constructor and the~~
	~~actual callback defined afterwards.~~
	~~This ensures the client reference in the callback function~~
	~~is valid.~~

	*/

	~~#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 };~~
	~~IPAddress ip(192, 168, 0, 4);~~
	~~IPAddress server(192, 168, 0, 100);~~

	~~// Callback function header~~
	~~void callback(char* topic, byte* payload, unsigned int length);~~

	~~EthernetClient ethClient;~~
	~~PubSubClient client(server, 1883, callback, ethClient);~~

	~~// Callback function~~
	~~void callback(char* topic, byte* payload, unsigned int length) {~~
	~~// In order to republish this payload, a copy must be made~~
	~~// as the orignal payload buffer will be overwritten whilst~~
	~~// constructing the PUBLISH packet.~~

	~~// Allocate the correct amount of memory for the payload copy~~
	~~byte* p = (byte*)malloc(length);~~
	~~// Copy the payload to the new buffer~~
	~~memcpy(p,payload,length);~~
	~~client.publish("outTopic", p, length);~~
	~~// Free the memory~~
	~~free(p);~~
	}

	~~void setup()~~
	{

	~~Ethernet.begin(mac, ip);~~
	~~if (client.connect("arduinoClient")) {~~
	~~client.publish("outTopic","hello world");~~
	~~client.subscribe("inTopic");~~
	}
	}

	~~void loop()~~
	{
	~~client.loop();~~
	}

Onnowpurbo at 09:29, 11 May 2018

2018-05-11T09:29:42Z

← Older revision		Revision as of 09:29, 11 May 2018
Line 1:		Line 1:
	/*		/*
	Publishing in the callback		Publishing in the callback

	- connects to an MQTT server		- connects to an MQTT server
	- subscribes to the topic "inTopic"		- subscribes to the topic "inTopic"
	- when a message is received, republishes it to "outTopic"		- when a message is received, republishes it to "outTopic"

	This example shows how to publish messages within the		This example shows how to publish messages within the
	callback function. The callback function header needs to		callback function. The callback function header needs to
	be declared before the PubSubClient constructor and the		be declared before the PubSubClient constructor and the
	actual callback defined afterwards.		actual callback defined afterwards.
	This ensures the client reference in the callback function		This ensures the client reference in the callback function
	is valid.		is valid.

	*/		*/

	#include <SPI.h>		#include <SPI.h>
	#include <Ethernet.h>		#include <Ethernet.h>
	#include <PubSubClient.h>		#include <PubSubClient.h>

	// Update these with values suitable for your network.		// Update these with values suitable for your network.
	byte mac[] = { 0xDE, 0xED, 0xBA, 0xFE, 0xFE, 0xED };		byte mac[] = { 0xDE, 0xED, 0xBA, 0xFE, 0xFE, 0xED };
	IPAddress ip(192, 168, 0, 4);		IPAddress ip(192, 168, 0, 4);
	IPAddress server(192, 168, 0, 100);		IPAddress server(192, 168, 0, 100);

	// Callback function header		// Callback function header
	void callback(char* topic, byte* payload, unsigned int length);		void callback(char* topic, byte* payload, unsigned int length);

	EthernetClient ethClient;		EthernetClient ethClient;
	PubSubClient client(server, 1883, callback, ethClient);		PubSubClient client(server, 1883, callback, ethClient);

	// Callback function		// Callback function
	void callback(char* topic, byte* payload, unsigned int length) {		void callback(char* topic, byte* payload, unsigned int length) {
	// In order to republish this payload, a copy must be made		// In order to republish this payload, a copy must be made
	// as the orignal payload buffer will be overwritten whilst		// as the orignal payload buffer will be overwritten whilst
	// constructing the PUBLISH packet.		// constructing the PUBLISH packet.

	// Allocate the correct amount of memory for the payload copy		// Allocate the correct amount of memory for the payload copy
	byte* p = (byte*)malloc(length);		byte* p = (byte*)malloc(length);
	// Copy the payload to the new buffer		// Copy the payload to the new buffer
	memcpy(p,payload,length);		memcpy(p,payload,length);
	client.publish("outTopic", p, length);		client.publish("outTopic", p, length);
	// Free the memory		// Free the memory
	free(p);		free(p);
	}		}

	void setup()		void setup()
	{		{

	Ethernet.begin(mac, ip);		Ethernet.begin(mac, ip);
	if (client.connect("arduinoClient")) {		if (client.connect("arduinoClient")) {
	client.publish("outTopic","hello world");		client.publish("outTopic","hello world");
	client.subscribe("inTopic");		client.subscribe("inTopic");
	}		}
	}		}

	void loop()		void loop()
	{		{
	client.loop();		client.loop();
	}		}

Onnowpurbo: Created page with " /* Publishing in the callback - connects to an MQTT server - subscribes to the topic "inTopic" - when a message is received, republishes it to "outTopic" Th..."

2017-05-10T22:06:22Z

Created page with " /* Publishing in the callback - connects to an MQTT server - subscribes to the topic "inTopic" - when a message is received, republishes it to "outTopic" Th..."

New page

/*
Publishing in the callback

- connects to an MQTT server
- subscribes to the topic "inTopic"
- when a message is received, republishes it to "outTopic"

This example shows how to publish messages within the
callback function. The callback function header needs to
be declared before the PubSubClient constructor and the
actual callback defined afterwards.
This ensures the client reference in the callback function
is valid.

*/

#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 };
IPAddress ip(192, 168, 0, 4);
IPAddress server(192, 168, 0, 100);

// Callback function header
void callback(char* topic, byte* payload, unsigned int length);

EthernetClient ethClient;
PubSubClient client(server, 1883, callback, ethClient);

// Callback function
void callback(char* topic, byte* payload, unsigned int length) {
// In order to republish this payload, a copy must be made
// as the orignal payload buffer will be overwritten whilst
// constructing the PUBLISH packet.

// Allocate the correct amount of memory for the payload copy
byte* p = (byte*)malloc(length);
// Copy the payload to the new buffer
memcpy(p,payload,length);
client.publish("outTopic", p, length);
// Free the memory
free(p);
}

void setup()
{

Ethernet.begin(mac, ip);
if (client.connect("arduinoClient")) {
client.publish("outTopic","hello world");
client.subscribe("inTopic");
}
}

void loop()
{
client.loop();
}