New emonHub > Emoncms MQTT Setup

glyn.hudson · 13 May 2016 15:34

Continuing the discussion from emonSD-03May16 Release:

Here is the data flow used by latest EmonHub and Emoncms MQTT input on the latest emonSD image :

RFM69CW Receives data (passed via serial port from emonPi) >
emonHub Decodes and posts to MQTT emon/ topic >
Mosquitto MQTT server running locally >
Emoncms MQTT input process subscribes to MQTT emon/ topic >
Data appears in Emoncms Inputs

Step 2. where emonHub decodes the RFM69CW data still uses the emonHub node decoders set in emonhub.conf. This is where your inputs get named. The MQTT topics and sub-topics are named using the node and key names from emonhub.conf

Graphical form:

See this page for how to configure emonHub node decoders:

github.com

openenergymonitor/emonhub/blob/emon-pi/configuration.md

# EmonHub Configuration

emonHub is configured with `emonhub.conf` config file. On the emonPi / emonBase this file is located in the R/W data partition `/home/pi/data/emonhub.conf`. If the [Emoncms Config module](https://github.com/emoncms/config) is installed (as in the case of the emonPi / emonBase using pre-buit SD card image) the config file can be edited direct from the EmonHub tab in local Emoncms, see [User Guide](https://guide.openenergymonitor.org)

Emonhub.conf has 3 sections:

## 1. `hub`

Hub is a section for emonhub global settings such as the loglevel.


## 2. `interfacers`

Interfacers holds the configuration for the different interfacers that emonhub supports such as the EmonHubJeeInterfacer for reading and writing to the RFM69Pi adapter board or emonPi board via serial, or the EmonHubMqttInterfacer which can be used to publish the data received from EmonHubJeeInterfacer to MQTT topics. For more interfacer examples see [conf/interfacer_examples](https://github.com/openenergymonitor/emonhub/blob/emon-pi/conf/interfacer_examples)


## 3. `nodes`

Nodes holds the decoder configuration for rfm12/69 node data which are sent as binary structures.

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I will add a flow diagram to the MQTT Inputs page