openLuup email server

[akbooer]

In fact, just change the topic to tele/tasmota_test/SENSOR. It should update the temperature variable with the whole JSON string, which will actually need decoding.

[ArcherS]

@akbooer I changed the topic to tele/tasmota_test/SENSOR and now the temp variable is updated with the complete string:

{"Time":"2021-03-13T19:59:43","AM2301":{"Temperature":26.6,"Humidity":41.6,"DewPoint":12.5},"TempUnit":"C"}

which means that it actually gets updated.
One step in the right direction.

[akbooer]

The basic code, without error checking, would be:

local json = require "openLuup.json"

function MyMQTThandler (topic, message)
  local info = json.decode (message)
  local t = info.AM2301.Temperature
  luup.variable_set ("urn:upnp-org:serviceId:TemperatureSensor1", "CurrentTemperature",  t, 216)
end

luup.register_handler ("MyMQTThandler", "mqtt:tele/tasmota_test/SENSOR")

[ArcherS]

@akbooer thanks for the assistance and patience, now it works!

Edit: Added the humidity to the code:

local json = require "openLuup.json"

function MyMQTThandler (topic, message)
  local info = json.decode (message)
  local t = info.AM2301.Temperature
  local h = info.AM2301.Humidity
  luup.variable_set ("urn:upnp-org:serviceId:TemperatureSensor1", "CurrentTemperature",  t, 216)
  luup.variable_set ("urn:micasaverde-com:serviceId:HumiditySensor1", "CurrentLevel",  h, 228)
end

luup.register_handler ("MyMQTThandler", "mqtt:tele/tasmota_test/SENSOR")

[therealdb]

@akbooer can we pass more arguments (ie service, variables, device id) to the handler? It will make the code more generic.

[akbooer]

No need to have these as parameters... just make sure they’re in scope. The best way to do this is to put them in the same closure. You could even write a factory method to do this. There’s a trade-off between having multiple handlers for specific things and one which does many things. A lot of the choice will be governed by the topic structure. If, as is likely, a single handler manages a whole topic sub-tree, then you’ll probably want to subscribe to a wildcard topic of the form aaa/bbb/#.

[Buxton]

@akbooer Yes but as you can see on the connect, the version is "Version: Unknown (132)"

This is what is causing the problem. After much searching and trying different configs, I stumbled on the following which solved the problem. From mosquitto.org

try_private [ true | false ]
If try_private is set to true, the bridge will attempt to indicate to the remote broker that it is a bridge not an ordinary client. If successful, this means that loop detection will be more effective and that retained messages will be propagated correctly. Not all brokers support this feature so it may be necessary to set try_private to false if your bridge does not connect properly.

Defaults to true.

So I set the attribute to false in my bridge config and immediately connected openLuup to the mosquitto broker. The connect packet shows the right version, and with a luup reload, all of my mosquitto broker topics populated in mqtt explorer that was pointed at openLuup. However, I don't see the topics in the mqtt console on openLuup?? Which is odd because I not only see the openLuup topics in explorer, but I see the topics actively changing.

I'm not a good one to suggest code changes, but since this mosquitto setting defaults to true, can you try to incorporate the try_private flag in openLuup's MQTT server.... It took a long time to track this down and I imagine anyone else that tries to connect the two servers will be in for a similar bug fix adventure.

[Buxton]

image url)

openLuup Explorer

[Buxton]

image url))

openLuup's view

[Buxton]

[therealdb]

@akbooer when you have a lot of devices, it could become a lot of code to do the same things. I found the design of callbacks for variables watches very powerful for the very same reason. Are you saying that instead of a string for a separate function, I could just pass a closure as an argument?

[akbooer]

@therealdb said in openLuup: MQTT server:

Are you saying that instead of a string for a separate function, I could just pass a closure as an argument?

No, not that, although at the openLuup object-level API you can just pass a local function, rather than a string with the global function name.

I guess I’m not seeing your difficulty, can you supply a (pseudo-)code example of what you’d like to be able to do?

[akbooer]

@buxton said in openLuup: MQTT server:

This is what is causing the problem. After much searching and trying different configs, I stumbled on the following which solved the problem.

Thanks SO MUCH for all the hard work, this is gold dust! I’ll see what I can do.

However, I don't see the topics in the mqtt console on openLuup?? Which is odd because I not only see the openLuup topics in explorer, but I see the topics actively changing.

Not an issue, I think. This is a list of SUBSCRIBED topics, not PUBLISHED ones. So I think it is working. A little test code with a wildcard subscription could confirm.

I'm not a good one to suggest code changes, but since this mosquitto setting defaults to true, can you try to incorporate the try_private flag in openLuup's MQTT server.... It took a long time to track this down and I imagine anyone else that tries to connect the two servers will be in for a similar bug fix adventure.

Absolutely... but I’m still not understanding what the difference is... I will dig further.

Many thanks again.

[therealdb]

@akbooer something like this

function MyMQTThandler (topic, msg, state)
   local info = json.decode (message)
   local t = state.path
   luup.variable_set ("urn:upnp-org:serviceId:TemperatureSensor1", "CurrentTemperature",  t, state.deviceID)
  
 end
  
 luup.register_handler ("MyMQTThandler", "mqtt:tele/#/SENSOR", {deviceID=255, description ="outdoor", path = "info.AM2301.Temperature"})

luup.register_handler ("MyMQTThandler", "mqtt:tele/#/SENSOR", {deviceID=266, description ="indoor", path = "info.DS18B20.Temperature"})

Passing a generic state will make handlers more compact and reusable.

[akbooer]

@akbooer said in openLuup: MQTT server:

... I will dig further.

...and have now done so.

@Buxton, would it be at all possible to try this (latest development v21.3.14b) with the original bridging configuration? My implementation now, effectively, ignores the try_private flag, so will still behave as an ordinary client. Any magic of topic filtering, and the like, will still have to be configured on Mosquitto (if required.) It might be wise to limit the topics sent to those which are actually needed.

[akbooer]

@therealdb said in openLuup: MQTT server:

something like this

I see.

Well, as I said, you can do it right now like this:

local mqtt = require "openLuup.mqtt"

local function MyMQTThandler (info)
  return function (topic, message)
    local state = json.decode (message)
    local t = state.path
    luup.variable_set ("urn:upnp-org:serviceId:TemperatureSensor1", "CurrentTemperature",  t, state.deviceID)
  end
end
 
mqtt.register_handler (MyMQTThandler {deviceID=255, description ="outdoor", path = "info.AM2301.Temperature"}, "tele/+/SENSOR")
mqtt.register_handler (MyMQTThandler {deviceID=266, description ="indoor", path = "info.DS18B20.Temperature"}, "tele/+/SENSOR")

So, I obviously haven't been able to test exactly this, but I tried instead:

function MyHandler (state)
  return function (topic, message)
    luup.log ((json.encode {MQTTtest = {
      topic = topic, 
      message = message,
      state = state}}))
  end
end

local mqtt = require "openLuup.mqtt"
mqtt.register_handler (MyHandler ("the rain Spain"), "shellies/#")
mqtt.register_handler (MyHandler {"the", "rain","in","Italy"}, "shellies/#")

So there are two calls to MyHandler, which is actually a factory methodsto produce callbacks with the state parameter in the closure of that function. The handler itself simply logs its parameters as a JSON structure. An extract from the log shows that each has been called, in response to a message published by a Shelly, but with their own state (one is a string, the other an array of strings.)

2021-03-14 17:25:26.217   luup_log:0: {"MQTTtest":{
    "message":"0",
    "state":"the rain Spain",
    "topic":"shellies/shellyix3-68C63AFA97F5/input/0"
  }}
2021-03-14 17:25:26.217   luup_log:0: {"MQTTtest":{
    "message":"0",
    "state":["the","rain","in","Italy"],
    "topic":"shellies/shellyix3-68C63AFA97F5/input/0"
  }}

The only small issue I see is that you used this wildcard subscription topic: tele/#/SENSOR which isn't valid for MQTT, I think you meant: tele/+/SENSOR, and the other small issue with that is that I haven't (yet) implemented the '+' wildcard, although you can certainly use '/#' at the end of a topic, as I did in the above example.

Note, also, that when calling the object-level method in openLuup, you don't use the mqtt: prefix, but just the topic itself (since you are directly calling the MQTT request_handler function.)

This might seem a bit cumbersome, and I will take a look at adding the extra parameter in the way that you suggest.

[therealdb]

Thanks for the clarification! I was obviously referring to + instead of #.

The idea is to write very generic routines to push sensors data.

[Buxton]

@akbooer Yes, I was thinking along those lines as the bridge config allows filters. The latest openLuup version now works fine with try_private flag set to default (true). Thanks for nailing this down and your work is definitely appreciated. Below is the connection to openLuup.

Here's my Mosquitto config for anyone who wants to bridge the two brokers:

allow_anonymous true
password_file /mosquitto/data/PW.txt
listener 1883
connection openLuup
address 127.0.0.1:1882
topic # out 0
topic # in 0
cleansession false
notifications true
username XXXXX
password YYYYYYYYYY
bridge_protocol_version mqttv311

Most of these settings can/should be modified to suit one's particular needs, but the settings should be employed. The password file for mosquitto needs to be encrypted with mosquitto's built-in encryption tool. The directions are straightforward and are described in on-line documents.

[akbooer]

Excellent news – thanks again for all the detective work.

[akbooer]

@therealdb said in openLuup: MQTT server:

The idea is to write very generic routines to push sensors data.

The latest development version 21.3.19 supports an additional parameter to luup.register_handler() as per your suggestion. For which, thanks.

Lua Startup:

function test_MQTT_callback (...)
  luup.log ((json.encode {...}))
end

luup.register_handler ("test_MQTT_callback", "mqtt:test", {a = "A", b = "B"})
luup.register_handler ("test_MQTT_callback", "mqtt:test", {c = "C", d = "D"})

Lua Log:

2021-03-19 16:28:21.850   luup_log:0: ["test","hello world",{
  "a":"A",
  "b":"B"
}]
2021-03-19 16:28:21.850   luup_log:0: ["test","hello world",{
  "c":"C",
  "d":"D"
}]