emoncms mqtt module

Submitted by nubble on Mon, 04/08/2014 - 18:51

ive installed the mqtt module for emoncms from trystans github page. installed SAM as well as its required.

i however cant find anything else on how to get going with it. in emoncms i have an extras tab with mqtt in it. so i guess the module is installed. however when i click on the mqtt button i get the following error:

Fatal error: Call to a member function fetch_array() on a non-object in C:\wamp\www\emoncms\Modules\mqtt\mqtt_model.php on line 26
Call Stack
# Time Memory Function Location
1 0.0020 156304 {main}( ) ..\index.php:0
2 0.0260 379264 controller( ) ..\index.php:107
3 0.0280 391704 mqtt_controller( ) ..\core.php:66
4 0.0280 401680 Mqtt->get( ) ..\mqtt_controller.php:26

any help would be appreciated.

i am running emoncms on windows 7 and using wampserver.

thanks

jason

Re: emoncms mqtt module

Submitted by nubble on Thu, 07/08/2014 - 14:23.

Anyone?

Am I getting no reply because I use Windows? ;)

Re: emoncms mqtt module

Submitted by Robert Wall on Thu, 07/08/2014 - 16:20.

Possibly, but that's most likely because there seem to be a lot less WAMP users than Raspberry Pi users. I used to have WAMP on Windows XP, but this year I upgraded my laptop but it came with downgraded software (Win 8), so I upgraded the software to Ubuntu. Sorry, but I can't help.

Re: emoncms mqtt module

Submitted by nubble on Fri, 08/08/2014 - 06:53.

Thanks Robert,

Im going to install into ubuntu and see if I get the same error.

Re: emoncms mqtt module

Submitted by nubble on Fri, 08/08/2014 - 13:41.

ok, Ubuntu install works and the mqtt module loads via emoncms. So I guess there is some issue with Wamp, but Im abandoning that.

My next problem is how to configure the emoncms mqtt module? I have been using MQTT for a while but have never come across the "field" and "expression" config items. Can emoncms local receive published mqtt messages from this module?

Anyone with a sample config?

I have tried what I understand to be the best config I know but cant get the mqtt module to subscribe to my broker. Here is my config:

Host: IP Address = localhost

Port:=1883 [this should not be a fixed radio button. I use 1884 at home]

Node=1

Topic= 1/10/$P/151

Type=sub

qos=0

fields= <empty>

expression=<empty>

and under forward data to remote emoncms:

domain name=localhost [I only want to send to local emoncms inputs]

write api=<my api>

Thanks

Jason

Re: emoncms mqtt module

Submitted by TrystanLea on Fri, 08/08/2014 - 14:49.

Hello Jason, I've been wondering whether adding a python MQTT listener to EmonHub might be a better way to go for doing this kind of thing, are you familiar with EmonHub?: https://github.com/emonhub

Re: emoncms mqtt module

Submitted by nubble on Wed, 13/08/2014 - 13:40.

Hi,

I just checked out emonhub and I think it combines emonbase and emoncms into a single box? Makes sense to me.

I modded my emonTx sketches to publish mqttsn messages instead of the standard struct data. Not much additional radio overhead, and I can bypass a emonbase and route via a broker to any/multiple mqtt clients - like emoncms and Openhab.

Is the intention then to not have the emoncms mqtt module and then have a standalone script [read yet another standalone script in Jason's setup] do the translation from mqtt to json?

What about getting data out of emoncms and publishing via mqtt? For me this would work as I want to use emoncms analytics in other application tools as well like Openhab.

Thanks

Jason

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