Sending string to emonpi = How to configure emonhub.conf

richard · 17 May 2016 00:11

I would like to send a text string (as opposed to numbers) from one of my emonTHs to emonpi and emoncms. I tried various datacodes but could not find one that allowed strings. Can someone point me in the right direction? (Like to a list of all supported datacodes for emonhub).

Thanks

glyn.hudson · 17 May 2016 07:48

You could try ‘c’ char data code, not tried this ourselves. Here’s the emonhub config documentation:

github.com

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

# 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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Let us know how you get on.

pb66 · 17 May 2016 10:40

I’ll be interested in how you get on with this too.

Don’t forget that when specifying the node definition in datacodes the packet size is then set (as a sum of the datacode sizes) so your strings will need to be of a fixed length, so some padding may be required in places.

richard · 17 May 2016 15:28

Will do. I simply want to send a LOW, or HIGH (as opposed to a 0 or 1! I’ll give it a try and see how it works out!

Thanks!