know the status of esp, alive or not?

[megamarco83]

hi, is it possible to send and http command to nodemcu with espeasy to know if it's alive or not?
i would like to implement something that can respond as:

Code: Select all

{
"status": "ok",
"version": "3.403",
"request": {
"route": "/handshake"
},
"response": {
"homewizard": "yes",
"version": "3.403",
"firmwareupdateavailable": "no",
"appupdaterequired": "no",
"serial": "130103285"
}
}

nodemcu can react with something like this??
it would be better than to just send a ping
thanks

[grovkillen]

Using MQTT you get this feedback for free. But using HTTP you need to have the units push an answer (using rules) if an event is sent to it.

[dynamicdave]

I'm also interested,
Please enlighten me as to how you do it with MQTT.

Cheers from David

[grovkillen]

If the LWT isn't published then the broker believes that the unit is still alive and kicking. To be even more sure about it's state you either use a heartbeat topic or have it respond on events.

[megamarco83]

If the LWT isn't published then the broker believes that the unit is still alive and kicking. To be even more sure about it's state you either use a heartbeat topic or have it respond on events.

thanks for answer, could you please provide an example of rule and the mqtt string to ask if it's alive or not?
thanks

[megamarco83]

any help on examples rule and request?
thanks

[grovkillen]

I do this with MQTT import.

I have all my nodes subscribing to "cmdMQTT" and I send an integer (number) 1...4 to that topic and all will reply to that.

So in the rules I have this

Code: Select all

On cmdMQTT#Code=1 Do
  Publish,%sysname%/Time,%systime%
EndOn

On cmdMQTT#Code=2 Do
  Publish,%sysname%/IP,%ip%
EndOn

On cmdMQTT#Code=3 Do
  Publish,%sysnam%/Status,Reconnecting Wifi
  Wifidisconnect
  Wificonnect
EndOn

On cmdMQTT#Code=4 Do
  Publish,%sysname%/Status,Rebooting
  Reboot
EndOn

A heartbeat rule is explained here: https://www.letscontrolit.com/wiki/inde ... using_MQTT

[megamarco83]

I do this with MQTT import.

I have all my nodes subscribing to "cmdMQTT" and I send an integer (number) 1...4 to that topic and all will reply to that.

So in the rules I have this

Code: Select all

On cmdMQTT#Code=1 Do
  Publish,%sysname%/Time,%systime%
EndOn

On cmdMQTT#Code=2 Do
  Publish,%sysname%/IP,%ip%
EndOn

On cmdMQTT#Code=3 Do
  Publish,%sysnam%/Status,Reconnecting Wifi
  Wifidisconnect
  Wificonnect
EndOn

On cmdMQTT#Code=4 Do
  Publish,%sysname%/Status,Rebooting
  Reboot
EndOn

A heartbeat rule is explained here: https://www.letscontrolit.com/wiki/inde ... using_MQTT

thaks so much!
and the code MQTT that you send to have an interrogation from code 1..4 how is made?
could be:

Code: Select all

mosquitto_pub -h localhost -m '{ "code" : 1 }' -t 'cmdMQTT/in'

[grovkillen]

I use MQTT Snooper for easier tests of MQTT communication. But you need to send the message as plain value.

Code: Select all

mosquitto_pub -h localhost -m '1' -t 'cmdMQTT'

[megamarco83]

I use MQTT Snooper for easier tests of MQTT communication. But you need to send the message as plain value.

Code: Select all

mosquitto_pub -h localhost -m '1' -t 'cmdMQTT'

sorry...i'm a little bit lost
i create a device "generic MQTT like this:

device_9.png (36.72 KiB) Viewed 7523 times

then i create the rules:

Code: Select all

On cmdMQTT#Code=1 Do
  Publish,%sysname%/Time,%systime%
EndOn

On cmdMQTT#Code=2 Do
  Publish,%sysname%/IP,%ip%
EndOn

i download the android app mqtt snooper
i create the host of raspberry (where i have installed my mqtt broker)
now if i go inside the "in" and paste the code

Code: Select all

mosquitto_pub -h localhost -m '1' -t 'cmdMQTT'

i do not receive nothing...
is it correct?

[grovkillen]

MQTT topic 1 should be cmdMQTT since that is the topic your sending to

[megamarco83]

ok thanks now understand!
i try the command and now i see that the variable is setted to 1 after send the mqtt string
now on my rules have:

Code: Select all

On cmdMQTT#Code=1 Do
  Publish,%sysname%/Time,%systime%
EndOn

so where i should see the responde of sysname?

[grovkillen]

You see it if you listen to that topic on the other unit (may it be a server or whatever).

[riker1]

Hi

I trried this

but subscription is not working I think

please show your setting in :
controller subscription here:

thanks T

[grovkillen]

MQTT import is it's own MQTT client so the topic(s) you type in the settings are the complete topic it will listen to.

[riker1]

ok thanks