M2M Bridge

Functionality

• Configurable edge intelligence
• Bridges standard and proprietary protocols to AMTech IoT DAP.
• Device-to-device or device-to-cloud communications.
  • MQTT, LLRP, CoAP, STOMP, SmartM2M, LWM2M, PLC, Zigbee and others
• Allow remote and centralized control of IoT devices and gateways.
  • SNMP/MIB/TRAP, Reader Management and other
• Configurable auto-discover
• Implements common functionality and orchestrates the execution of the protocols
• Network failure detection and recovery
• Get centralized configuration information at startup and real time modifications
• Access control policies to manage observation production and consumption

Edge Configuration

• Edge/Device(s) site configuration bridgeConfig.json

   {
   //text to label bridge instance
   "description": "AMTech M2M Bridge", 
       "dap":{
           //amtech IoT DAP ur
           "dapUrl": "https://dap.amtech.mx",     
           //userid for the m2mBridge instance bridgeId 
           "userId": "xxxxxxx@amtech.mx",
           // tenant where bridge been configured       
           "tenant" : "xxxxxxx",  
           //m2mBridge userId password  
           "password" :"xxxxxxxx"
       },
        //Id to uniquely identify a M2MBridge instance, in absence of this property a unique identifier gets created
       "bridgeId":"m2mBridgeProgressNext",       
        //wkt location to set m2mBridge location overrides address
       "location": "{\"wkt\":\"POINT(-99.17125583 19.40501031)\",\"sContext\":\"geo\"}",       
       //Address use to geo locate m2mBridge instance
       "address" :{				 
           "country" : "usa",
           "city": "Las Vegas",
           "road": "Las Vegas Boulevard South",
           "number":"3960"
       },
   }

Cloud Configuration

• Create an amtechM2mBridge thing type instace (See "/amtech/linkeddata/types/composite/entity/amtechM2mBridge")
• Create an actor with the polices required by the activity(s) (See Actors)
  • Add the things type polices the bridge needs access to
  • Police must have user check; enabling instance access control by m2mBridge instance
  • Include in the polices the thing types the bridge instantiates
• Register a follower (See Roles)
  • Assign to follower actor "m2mBridge" access
  • Uniquely identify each m2mBridge
• Activity observation configuration (See Observation production configuration)
  • Add the Things types the bridge will use (See Thing types)
    • Add the observations types from selected thing type the bridge will produce or consume (See Observations and observation types CRUD observations)
  • Configure the topic that m2mBridge will listen for crud and command observations has to matched with others things' observation production configuration hosted at this m2mBridge configuration (See Observation production configuration Topics)
• Things instance creation
  • Using amtech creator experience (See Thing types)
  • Configuring autoDiscover (See Edge Configuration)
    • set amtechM2MBridge instance property cloneByFollowerActor to true, the bridge will request the DAP to clone amtechM2MBridge instance with the name convention clonePrefix:bridgeId from bridgeConfig.json
    • the things instances link to the amtechM2MBridge instance property bridgeInstances will be cloned with the name convention clonePrefix:bridgeId from bridgeConfig.json
• Monitoring M2MBridge status
  • Create an SNMPDevice instance given access to the M2MBridge user (See "/amtech/linkeddata/types/composite/entity/SNMPDevice")
    • Create a reasoner to monitor disk, cpu and memory usage as needed by IoT solution

Implementation notes

• M2MBridge is an open source nodes stack developed by the AMTEch team; it discovers, loads nodes modules implementing "M2MBridge plugin interface" and creates thing types instances (See Thing types) tacking into account the observation production configuration (See Observation production configuration) and M2MBridge credentials (See Actors and Edge Configuration).
  • It leverages AMTech IoT DAP (See Integration Guideline)
    • Gets observation production configuration (See Observation production configuration API)
    • Gets thing types instances (See Observation instances API)
    • Creates a web socket to receive asynchronous commands and thing instances changes (crud operations) (See CRUD and Commands API)
      • Dispatch command observations to plugin instance leveraging thing type instance @id (See Thing types)
      • Restart instance when supported properties change by calling stop and star plugin interface
    • Creates configuration information for Thing type leveraging configuration information and client side M2MBridge placeholders (See Observation production configuration and Placeholders)
    • Load plugin nodes modules required by configuration
    • Creates an instance of plugin for each type from observation production configuration leveraging thing type instance @id (See Thing types)
      • JavaScript object is extended with the properties values from the thing instance (See plugin example )
      • Properties and methods are injected like common logg for m2mBridge plugins, methods to send observations with and without transformation, methods for restarting, observation production configuration and others (See for details)
      • If instance does not exist at the server side execute auto discover process from bridgeConfig.json can be configured (See Edge Configuration)
    • Creates a centralized observation dispatcher with persistence to ensure:
      • Observations delivery.
      • The order that observations occurred .

How to implement a new plugin

• Clone git repository (https://github.com/AMTechMX/M2MBridge.git)
  • at /.../M2MBridge/plugins create a directory that matched with the Thing type name to bridge example SNMPDevice (See Thing types)
• Implement a nodejs module with the following interface

   function SNMPDevice() {
   }
   SNMPDevice.prototype.start = function ( complete) {
       try {
           complete(null);
       } catch (e) {
           complete(e);
       }
   };
   SNMPDevice.prototype.stop = function (complete) {
       try {
           complete(null);
       } catch (e) {
           complete(e);
       }
   };
   SNMPDevice.prototype.command = function (observation, complete) {
       try {
           complete(null);
       } catch (e) {
           complete(e);
       }
   };
   module.exports.SNMPDevice = SNMPDevice;

How to install it

• Clone git repository (https://github.com/AMTechMX/M2MBridge.git)
• Install nodejs https://nodejs.org/en/download/package-manager/
• Install npm (http://blog.npmjs.org/post/85484771375/how-to-install-npm)
• Delete at /.../M2MBridge/plugins/xxx unneeded plug-ins
• Install packages for m2mBridge core and plug-ins (https://docs.npmjs.com/cli/install:)
• Execute npm install at:
  • M2MBridge directory
  • each plug-in directory