LastWill mqtt?

[timsson]

Hi,
is somethink like that possible?

Code: Select all

#define MQTT_TOPIC_LAST_WILL "/ESP_02/lwt"
mqttClient.connect("ESP_02", MQTT_TOPIC_LAST_WILL, 1, true, "disconnected");
mqttClient.publish(MQTT_TOPIC_LAST_WILL, "connected", true);

[chrille]

Hi,
is somethink like that possible?

Code: Select all

#define MQTT_TOPIC_LAST_WILL "/ESP_02/lwt"
mqttClient.connect("ESP_02", MQTT_TOPIC_LAST_WILL, 1, true, "disconnected");
mqttClient.publish(MQTT_TOPIC_LAST_WILL, "connected", true);

I support this! LWT support for MQTT would be great - however I think some kind of integration with the UI is preferred. Maybe just a checkbox under MQTT settings, or under advanced settings

- Jan

[timsson]

Unfortunately, me is as noob the implementation not possible, but i can wait in this great project!
Thanks alot

[timsson]

Hi,
can you explain the Command.ino with connect?
Maybe we can use lwt???
??On System#Boot do
connect("ESP_02", MQTT_TOPIC_LAST_WILL, 1, true, "disconnected");
publish(MQTT_TOPIC_LAST_WILL, "connected", true);
??
Thanks

P.S.
Thx for this, it works great!
On <event> do
publish /ESP_01/gpio/2 0
endon

[tozett]

What is your usage of this?
Would be interested in an example.
Thanks for that, if you could provvide one...

[timsson]

Hello tozett,
i use it to check the status in openhab/mqtt. If the battery or the wifi are down, lastwill change to "disconnectet"
For me is this a good and fast indicator...

Code: Select all

openhab item:
String ESP_04kalive	"keep alive_4: [%s]" {mqtt="<[localbroker:/ESP_04/lwt:state:default]"}

Thx!

keepalive.jpg (44.67 KiB) Viewed 17570 times

[tozett]

Ah, ok. thanks for supplying me this info.

i am on r105, did you implement the LWT with rules? could you post your working example?

i read on the net some background,

The Last Will and Testament (LWT) feature is used in MQTT to notify other clients about an ungracefully disconnected client. Each client can specify its last will message (a normal MQTT message with topic, retained flag, QoS and payload) when connecting to a broker. The broker will store the message until it detects that the client has disconnected ungracefully. If the client disconnect abruptly, the broker sends the message to all subscribed clients on the topic, which was specified in the last will message. The stored LWT message will be discarded if a client disconnects gracefully by sending a DISCONNECT message.

and i will take over this function to my system. fantastic state info of the ESPs,
thanks

[timsson]

i am on r105, did you implement the LWT with rules? could you post your working example?

I use also r105, fantastic projekt! but for lwt i take my one ino file with exactly this syntax and it works fine:

Code: Select all

#define MQTT_TOPIC_LAST_WILL "/ESP_02/lwt"
mqttClient.connect("ESP_02", MQTT_TOPIC_LAST_WILL, 1, true, "disconnected");
mqttClient.publish(MQTT_TOPIC_LAST_WILL, "connected", true);

or do you need the complete ino?
and i use this library:
PubSubClient by Nick O'Leary Version 2.6.0 mqtt3.1.1

[tozett]

you mean, you patch the source?
it is not coded in r105 somehow?

its not in there:
https://github.com/ESP8266nu/ESPEasy/se ... &type=Code
so it is/could be feature-request for r106 ...?

[timsson]

so it is/could be feature-request for r106 ...?

sorry, yes - i send you a pm

[tozett]

thanks,
but i thought martinus will maybe reads this,
and will implement this in the gui.

configurable last-will-message ...


--i put this on the feature-request list ... and let us be suprised with r106 ..

[JR01]

Would like to use LWT as well, +1+1 here

[lucaberta]

or do you need the complete ino?
and i use this library:
PubSubClient by Nick O'Leary Version 2.6.0 mqtt3.1.1

@timsson have you patched all the source code to support the lastest 2.6.0 version of PubSubClient?

I had to revert back to 1.9.1 to compile ESPEasy earlier today, and was wondering how difficult it would be to refresh the code to support all the latest versions of the different libraries.

Ciao, Luca

[timsson]

... oh i see a new pubsubclient version by martinus!
great work!
Who can integrale lwt?

[timsson]

maybe:

ESPEasy.ino
-------------------------
#define MQTT_TOPIC_LAST_WILL "/ESP_01/lwt"

// Setup MQTT Client
byte ProtocolIndex = getProtocolIndex(Settings.Protocol);
if (Protocol[ProtocolIndex].usesMQTT)
MQTTConnect();
MQTTclient.publish(MQTT_TOPIC_LAST_WILL, "connected", true);
sendSysInfoUDP(3);
-------------------------

Controller.ino
-------------------------
//boolean connect(const char* id, const char* user, const char* pass, const char* willTopic, uint8_t willQos, boolean willRetain, const char* willMessage);
MQTTclient.connect("ESP_01", MQTT_TOPIC_LAST_WILL, 1, true, "disconnected");
if ((SecuritySettings.ControllerUser[0] != 0) && (SecuritySettings.ControllerPassword[0] != 0))
------------------------

->
mosquitto_sub -t /ESP_01/# -v
/ESP_01/lwt connected
/ESP_01/sys/wifi -77
/ESP_01/sys/wifi -78
/ESP_01/sys/wifi -76
/ESP_01/sys/wifi -75
/ESP_01/sys/time 2
/ESP_01/sys/freeram 26200
/ESP_01/lumi/lux 1024
/ESP_01/lwt disconnected

[Martinus]

last will is currently implemented with a fixed "connection lost" message to <template>/status topic. Same topic as used for status requests.

[tozett]

+1
great, thanks!

[JR01]

last will is currently implemented with a fixed "connection lost" message to <template>/status topic. Same topic as used for status requests

Hi @Martinus, somehow I missed the ability to do a status request, I search the forum, don ton get it. Does one send a message into <template>/status on the ESP, and then get a status back? I tried a few ideas, not getting a response back. Also listened in this queue - whilst rebooting the ESP, nothing. Could you point us in the correct direction?

[JR01]

Thanks Martinus for the updates,

I am on R108, let me upgrade first.... // {post edited after firmware update}

Okay, done, on R118, with pubsub v2.6, wow, looks stable.... So, how can I use the <>/status MQTT queue? Can I push a question into the queue to get status info back? How?

[tozett]

subscribe to the status-topic, like to any other topy in mqtt

http://www.hivemq.com/blog/mqtt-essenti ... -subscribe

[JR01]

Thank you @tozett, I got that part working, get my message "Connection Lost" on the <template>/status MQTT channel. But I was asking if it was also designed to ask questions on that channel and get answers back?

[timsson]

Hello,
please can you add this:?
MQTTclient.publish(LWTTopic.c_str() , "connected", true);
Thanks!

[JR01]

Hi @timsson ,

I assume this code you are using for, is to send the opposite of 'Connection Lost' - once only, on mqtt connect?

If so: +1 on this request...

...as I want to store in a MySQL db when connection is lost, with the time, and then do same when the connection is re-established.

[jsilver]

I assume this code you are using for, is to send the opposite of 'Connection Lost' - once only, on mqtt connect?

+1 from me too

[wutu]

It would be good to solve this separate topic. With online/connected status.

Now I find out whether the device is reconnected to a broker. Respectively. I have in my system two rules are in addition to achieve this.

See also viewtopic.php?f=6&t=2352