MQTTAlert app is an MQTT client that allows you to monitor your devices for configurable conditions (door open,temperature > x degrees, etc). When the condition is met you will get a phone notification or a phone configurble sound alarm. Each received MQTT message is stored in a local database that can also be exported to csv file for analysis. Analog  payloads are also displayed as time series. One can also configure each alert to publish commands depending on the alert status. For example you could publish an MQTT command that switch on a fan when the temperature is higher than a specified value and switch it off when it is below (with configurable hysteresis). Commands can also be published manually from the UI in different formats including images.  JSON payloads and published commands are fully supported including nested fields and arrays. Wildcards for topics are fully supported for flexible alerts or messages configuration for multiple devices MsgPack is supported. Dashboard is now available and the app can now integraste some IFTTT events to be linked to alerts. 
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Monitor IOT devices on an MQTT network via visual and sound phone notifications