MQTT-flex

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There is a lot of approaches in integration of MQTT in devices and systems. One vendor prefer one topic with structured data payload, the another one prefer tree topic structure with simple value in data payload. MQTT-flex is a standard MQTT with specific configuration approach. The goal of MQTT-flex is to give a user oportunity to integrate NETIO device with any system with different data approach.

With MQTT-flex you can easily define the MQTT topics, payloads and device behaviour via text configuration in JSON object format. Since there is then lot of possibilities with such freestyle flexibility allowed, you can find bellow full set of all implemented attributes.

Supported devices:
PowerCable MQTT, PowerCable OEM (DevKit), PowerPDU 4PS, PowerDIN 4PZ, PowerBox 3Px

Simple MQTT-flex configuration example

Client Configuration

This configuration example set NETIO device to connect to broker.hivemq.com with mqtt protocol, no ssl connection with credetials freedom/peace|love|empathy4ALL.

Device Control

Device output 1 is controlled with action received by subscription to netio/${DEVICE_NAME}/output/1/action topic with QOS 0

Output State monitoring

Device send every 1000 ms message to topic with QOS 0, retain true information with output 1 state 

{
     "config":{
        "broker":{
            "url":"broker.hivemq.com",
            "protocol":"mqtt",
            "port":1883,
            "ssl":false,
            "type":"generic",
            "username":"freedom",
            "password":"peace|LOVE|empathy4ALL"
        },
        "subscribe":[{
               "topic":"netio/${DEVICE_NAME}/output/1/action",
               "qos":0,
               "target":"OUTPUTS/1/ACTION",
               "action":"${payload}"
           }
       ],
       "publish":[{
               "topic":"netio/${DEVICE_NAME}/output/1/state",
               "qos":0,
               "retain":true,
               "payload":"${OUTPUTS/1/STATE}",
               "events":[
                   {
                       "type":"timer",
                       "period":"1000"
                   }
               ]
           }
       ]
   }
}


MQTT flex JSON config philosophy

Configuration of MQTT in devices supporting MQTT flex is done by Template:JSON (JavaScript Object Notation). The file is separated into 3 sections according to their meaning:

  • broker (client connection setup)
  • publish (array of topics where to publish)
  • subscribe (array of topics where to subscribe)
{
      "config":{
          "broker":{
              config atribute 1 separated by comma... ,
              config atribute 2 separated by comma... ,
              config atribute 3 separated by comma... ,
              ... ,
              config atribute LAST not separated by comma...
          },
          "subscribe":[
              {
                  config atribute 1 separated by comma... ,
                  config atribute 2 separated by comma... ,
                  config atribute 3 separated by comma... ,
                  ... ,
                  config atribute LAST not separated by comma...
              }
          ],
          "publish":[
              {
                  first publish config atribute 1 separated by comma... ,
                  first publish config atribute 3 separated by comma... ,
                  ... ,
                  "events":[
                      {
                          first publish events config atribute 1 separated by comma... ,
                          first publish events config atribute 2 separated by comma... ,
                          ... ,
                          first publish events config atribute LAST not separated by comma...
                      }
                  ]
              },
              {
                  second publish config atribute 1 separated by comma... ,
                  second publish config atribute 3 separated by comma... ,
                  ... ,
                  "events":[
                      {
                          second publish events config atribute 1 separated by comma... ,
                          second publish events config atribute 2 separated by comma... ,
                          ... ,
                          second publish events config atribute LAST not separated by comma...
                      }
                  ]
              }
          ]
  }
}

Parameters

  • source
  • target
  • payload
  • event
  • delta
  • timer
  • type
  • period
  • actiondef

Target / Source

In MQTT-flex we use targets and sources specify where to apply some change or get value. Practically it means addressing of INPUTS and OUTPUTS.

INPUT / OUTPUT (Target) selection

NETIO Devices can have inputs and outputs which can be different type. When you want to work with some variable you have to specify on which I/O. For doing that in MQTT-flex is implemented structured addressing with "/" separator. See the steps below to get voltage on output 1.

1. At first specify if requested variable is from/for INPUT or OUTPUT using keywords "OUTPUTS" or "INPUTS" . 2. Add "/" separator 3. Specify the number of INPUT/OUTPUT to 1(or TOTAL for summary statistics if available) 4. Add "/" separator 5. Specify requested variable or command

Note: Not all of OUTPUTS/INPUTS support all variables. Available variables are closely connected with the device functions and I/O features.

Note2: INPUTS not yet implemented

Commands

Variables

In some parameters is nescessary to use variables to get current state and measurements. Variables are separated in two categories:

  • Target/Source variables
  • System variables

Target Source Variables

The list of available variables for each


OUTPUTS variables
  • OUTPUTS/X/VOLTAGE" [V]
  • OUTPUTS/X/CURRENT" [mA]
  • OUTPUTS/X/POWER_FACTOR [1]
  • OUTPUTS/X/LOAD mW
  • OUTPUTS/X/STATE [1]
  • OUTPUTS/X/ACTION
  • OUTPUTS/X/DELAY unsigned int [ms]
  • OUTPUTS/X/NAME [string]
  • OUTPUTS/X/FREQUENCY [Hz] two decimals
  • OUTPUTS/X/ENERGY [Wh]
  • OUTPUTS/X/ENERGY_START [epoch]
  • OUTPUTS/X/ENERGY_START_FMT [YYYY-MM-DD]
INPUT variables

Not yet implemented

TOTALs - for future use with devices having more than 1 measured output
  • OUTPUTS/TOTAL/ENERGY
  • OUTPUTS/TOTAL/LOAD
  • OUTPUTS/TOTAL/CURRENT
  • OUTPUTS/TOTAL/VOLTAGE
  • OUTPUTS/TOTAL/POWER_FACTOR
  • OUTPUTS/TOTAL/FREQUENCY

System variables

  • DEVICE_NAME
  • DEVICE_MAC
  • BRAND_NAME
  • BRAND_TYPE

Broker section

here you have to define URL or IP address of machine hosting MQTT broker, level of security used for protocol, auth data and optionally some specific MQTT attributes, which are in the spec, but not mandatory required

Item Presence Possible Values Description JSON Config Usage
url mandatory MQTT broker URL "url":"broker.hivemq.com"
port mandatory 1 - 65535 MQTT broker port "port":1883
ssl mandatory true, false Use SSL crypted communication selector "ssl":false
type mandatory generic Communication/setup type option "type":"generic"
username mandatory regexp+len Credentials for MQTT broker "username":"freedom"
password mandatory regexp+len Credentials for MQTT broker "password":"peace|LOVE|empathy4ALL"
clientid optional regexp+len MQTT clientid. Max. 32 characters. Variables ${DEVICE_MAC} or ${DEVICE_NAME} can be used "clientid":"myEcoTable01"
keepalive optional 1 - 65535 MQTT keep alive period in seconds "keepalive":90


Subscriber section

Item Presence Possible Values Description JSON Config Usage
topic mandatory see table below specification of the topic, which MQTT-flex device listens from broker and act accordingly "topic":"netio/${DEVICE_NAME}/output/1/action"
qos mandatory 0, 1 or 2 MQTT's Quality of Sevice - definition {here|http://docs.oasis-open.org/mqtt/mqtt/v3.1.1/errata01/os/mqtt-v3.1.1-errata01-os-complete.html#_Toc442180912} "qos":0
target mandatory internal definition of action, which can be performed above the specified output "target":"OUTPUTS/1/ACTION"
action mandatory a payload or a value the action attribute needs to have passed to "action":"${payload}"


Subscribe topic payload values specification for control of the output:

netio/<DEVICE_NAME>/output/1/action with payload for output control : (0 – off, 1 – on, 2 – short off, 3 – short on, 4 – toggle, 5 – no change)


Publish section

when you need to send some data from device towards the broker, you have to specify it in the publish section - you can send measurement data as they are implemented, or you can use translation tables to send some pre-defined strings or even send JSON object. these attributes can be send periodicaly every time the timer reached specified value in seconds or based on value change (something like delta principle, but using only value differrence within defined period)

Item Presence Possible Values Description JSON Config Usage
topic mandatory see table below definition of the topic, how it is registered towards MQTT broker "topic":"netio/${DEVICE_NAME}/output/1/load"
qos mandatory see table below MQTT's Quality of Sevice - definition {here|http://docs.oasis-open.org/mqtt/mqtt/v3.1.1/errata01/os/mqtt-v3.1.1-errata01-os-complete.html#_Toc442180912}
retain mandatory boolean: true or false MQTT's attribute to specify to broker how to store last received information - section 3.3.1.3 of {MQTT doc|http://docs.oasis-open.org/mqtt/mqtt/v3.1.1/errata01/os/mqtt-v3.1.1-errata01-os-complete.html#_Toc442180841} "retain":true
payload mandatory see table below definition of the topic, how it is registered towards MQTT broker "topic":"netio/${DEVICE_NAME}/output/1/load"
events mandatory see table below definition of events used for triggering sending of data via mqtt (change, delta, timer)


Basic MQTT flex JSON config example

   {
       "config":{
          "broker":{
              "url":"broker.hivemq.com",
              "protocol":"mqtt",
              "port":1883,
              "ssl":false,
              "type":"generic",
              "username":"freedom",
              "password":"peace|LOVE|empathy4ALL"
          },
          "subscribe":[{
                 "topic":"netio/${DEVICE_NAME}/output/1/action",
                 "qos":0,
                 "target":"OUTPUTS/1/ACTION",
                 "action":"${payload}"
             }
         ],
         "publish":[
             {
                 "topic":"netio/${DEVICE_NAME}/output/1/state",
                 "qos":0,
                 "retain":true,
                 "payload":"${OUTPUTS/1/STATE}",
                 "events":[
                     {
                         "type":"change",
                         "source":"OUTPUTS/1/STATE"
                     }
                 ]
             },
             {
                 "topic":"netio/${DEVICE_NAME}/output/1/load",
                 "qos":0,
                 "retain":false,
                 "payload":"${OUTPUTS/1/LOAD}",
                 "events":[
                     {
                         "type":"timer",
                         "period":1111
                     },
                     {
                         "type":"delta",
                         "source":"OUTPUTS/1/LOAD",
                         "delta":1
                     }      
                 ]
             }
         ]
     }
 }
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