Monitoring node sensors down / Nagios

[mickaelh51]

Hi,
I'm looking for a solution to monitor when a node sensor is down (power outage, etc ...).
Is there a list of node connected to gateway (MQTT gateway) ?

Ex:
Nagios script checks MQTT broker (Mosquitto) with special command, Mosquitto forwards this command to MQTT gateway (GatewayW5100MQTTClient) and gateway send a list of available nodes connected.

it's already exist ?

thanks in adavance

[mfalkvidd]

I am using check_json to fetch sensor information from Domoticz. Have no experience checking mqtt directly but finding a plugin shouldn't be that hard.

[mickaelh51]

Thanks @mfalkvidd
it's possible to parse many informations from gateway, it's a good new.
For Nagios plugin, it's no a problem I'm going to develop one

My question is: when a node sensor is down, my mqtt broker have in own memory the last data and it dont know that sensor is down

is there a mysensors "ping" like between sensor nodes and gateway ?

thanks in adavance

[sundberg84]

Hi!
Im using LUA in my controller (Domoticz) to check when a node was updated last time. If not updated when expected i get a notification.

[mickaelh51]

Thanks @sundberg84,
I'm already using this method with openhab
I will be continue to use it.