Cumulocity Configuration

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Cumulocity IoT is a cloud-based, real-time IoT management platform that's also compatible with Teltonika-Networks devices.

Introduction

This article contains step-by-step instructions on how to set up a Cumulocity server and register a Teltonika-Networks device on it.

Basic setup

Basic setup consists of:

Creating a Cumulocity account
Configuring Cumulocity on a Teltonika-Networks device
Registering the device on your Cumulocity server

Create an account

First of all, you will need to set up your Cumulocity environment (server).

Register an account on Cumulocity.
Wait a few minutes after the registration, open your email account and look for an email with the subject 'Welcome to Cumulocity IoT'. Open it and click 'Login to Cumulocity IoT'.
Upon a successful login you should be redirected to the Cumulocity Cockpit.

Configure a device

Set up Cumulocity on your Teltonika-Networks device.

Log in to your device's WebUI.
Go to System → Package Manager and install Cumulocity - Cloud of Things.
Go to Services → Cloud Solutions → Cumulocity and configure it as follows.
1. Enable Cumulocity
2. Enable SSL/TLS
3. Specify your Cumulocity server's address in the 'Server Address' field.
4. Set a connection frequency interval (at least 1 minute).
5. Click 'Save & Apply'.

Register a device

Register your Teltonika-Networks device on Cumulocity.

Find the 'Application switcher' in the top-right corner of the Cumulocity dashboard and go to 'Device management'.
Then expand the 'Devices' tab in left-hand menu, go to 'Registration' and click 'Register device'.
Complete the registration.
1. Choose 'General device registration'.
2. Enter your device's serial number into the 'Device ID' field. The serial number can be found on the device's housing, box or in the WebUI, Status → System page.
3. Click 'Next'.
If the device connects successfully, you should see an indication similar to the one below. Click 'Complete' to finish the registration.

Explanation of example application

There are two steps when adding new properties:

1. Writing template

2. Writing lua script which will stream information.

By default, template location inside router is „/usr/lib/lua/cm/srtemplate.txt“. It contains such content:

  rut955-v0.01

  10,100,GET,/identity/externalIds/SerialNumber/%%,,application/json,%%,STRING,

  10,101,POST,/inventory/managedObjects,application/json,application/json,%%,STRING,"{""name"":""%%"",""c8y_IsDevice"":{},""com_cumulocity_model_Agent"":{}}"

  10,102,POST,/identity/globalIds/%%/externalIds,application/json,application/json,%%,STRING STRING,"{""externalId"":""%%"",""type"":""SerialNumber""}"

  10,103,PUT,/inventory/managedObjects/%%,application/json,application/json,%%,STRING    STRING STRING,"{""name"": ""%%"", ""type"": ""%%""}"

  10,104,PUT,/inventory/managedObjects/%%,application/json,application/json,%%,STRING    STRING STRING STRING,"{""c8y_Hardware"":   {""model"":""%%"",""revision"":""%%"",""serialNumber"":""%%""}}"

  10,105,PUT,/inventory/managedObjects/%%,application/json,application/json,%%,STRING    STRING STRING STRING STRING STRING STRING,"{""c8y_Mobile"":   {""imei"":""%%"",""cellId"":""%%"",""iccid"":""%%"",""connType"":""%%"",""currentOperat   or"":""%%""},""signal"":""%%""}"

  10,106,PUT,/inventory/managedObjects/%%,application/json,application/json,%%,STRING    STRING STRING,"{""c8y_Network"":{""c8y_WAN"":{""ip"":""%%""}},""wanType"":""%%""}"

  10,107,PUT,/inventory/managedObjects/%%,application/json,application/json,%%,UNSIGNED STRING,"{""c8y_SupportedOperations"":[""%%""]}"

  10,108,PUT,/devicecontrol/operations/%%,application/json,application/json,%%,UNSIGNED    STRING,"{""status"":""%%""}"

  11,500,$.managedObject,,$.id
  11,501,,$.c8y_IsDevice,$.id
  11,502,,$.c8y_Restart,$.id,$.deviceId

First line contains template version. In this case it is „rut955-v0.01“.

When template is updated, version must be updated aswell, otherwise device will use non-updated template version.

The following lines contains requests starting with a number „10“ and responses - starting with a number „11“. Now explanation of request:

Type - 10

Code - 101

Method - POST

URL - /inventory/managedObjects

Content Type - application/json

Accept - application/json

Placeholder - %%

Params - STRING STRING

Template - JSON

Type – requests are identified by a number 10

Code – request code number, each request must contain unique number

Method – HTTP method of request

URL – URL that will be used in request

Content Type – it is Content-Type header field value

Accept – it is Accept header field value, mostly equal to Content Type

Placeholder - string which will be replaced in URL or Template JSON

Params – what kind of params are replaced, JSON template contains two strings

Template – JSON template which will be sent

Explanation of response:

Type - 11

Code - 502

Cond - <none>

Value 1 - $.c8y_Restart

Value 2 - $.id

Value3 - $.deviceId

Type – responses are identified by a number 11

Code – response code, each response must contain unique number

Cond – JSON path base pointing to an object or object list from which values are extracted

Value… - JSON values

Take a look for more information about templates: https://www.cumulocity.com/guides/reference/smartrest.

Now explanation of logic inside lua script. By default, example application’s lua script location is „/usr/bin/lua/cm“. Application will scan this folder for any *.lua files and load them if they contains „init“ function. Script’s „stream.lua“ content:

  -- stream.lua
  local utl = require "luci.util"
  local sys = require "luci.sys"
  local DEVICE_NAME = 'TLT-RUT955 Router'
  local DEVICE_TYPE = 'Router'

  function restart(r)
     local deviceId = r:value(2)
     c8y:send('108,'..deviceId..',SUCCESSFUL')
     sys.exec("reboot")
  end

  function init()
     srInfo('*** Stream Init ***')
     -- set device name and type
     c8y:send('103,'..c8y.ID..','..DEVICE_NAME..','..DEVICE_TYPE)
     -- set restart as supported operation
     c8y:send('107,'..c8y.ID..',c8y_Restart')
     -- set imei, cellid and iccid first time
     mobileDataStream()
     -- create timer which will stream mobile info data
     local m_timer = c8y:addTimer(10 * 1000, 'mobileDataStream')
     m_timer:start()   
     -- register restart handler
     c8y:addMsgHandler(502, 'restart')
     return 0
  end

  function mobileDataStream()
     local imei = utl.trim(sys.exec("gsmctl -i"))
     local cell = utl.trim(sys.exec("gsmctl -C"))
     local icc = utl.trim(sys.exec("gsmctl -J"))
     local type = utl.trim(sys.exec("gsmctl -t"))
     local oper = utl.trim(sys.exec("gsmctl -o"))
     local sign = utl.trim(sys.exec("gsmctl -q"))..' dBm'
     local req = '105,'..c8y.ID
     req = req..','..imei
     req = req..','..cell
     req = req..','..icc
     req = req..','..type
     req = req..','..oper
     req = req..','..sign
     -- send mobile info
     c8y:send(req)
     local wantype = utl.trim(sys.exec("uci get -q network.wan.ifname"))
     local wanip = utl.trim(sys.exec("curl -s http://whatismyip.akamai.com"))
     -- send wan info
     c8y:send('106,'..c8y.ID..','..wanip..','..wantype)
  end

Once application finds lua script, it will call „init“ function. This is where all initialization of timers and other stuff should be.

Sending information is quite simple:

  c8y:send('103,'..c8y.ID..','..DEVICE_NAME..','..DEVICE_TYPE)

By using „c8y:send“ function, first string contains request code, which was defined in the template, earlier. Then comma must appear after each value. The above line shows how we update device name and device type with our own.

For more information about Lua API, download Cumulocity C++ SDK: https://bitbucket.org/m2m/cumulocity-sdk-c/downloads and look up inside „sdk/doc/lua.html“ with a browser.