Add smart buildings technical primer

docs/tech_primer.md

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+# Smart-Ready Building Technical Primer
+
+This document provides  primer for smart-ready building assembly, to essentially
+answer the question *"What does Smart Ready mean?"* and *"How do we know it to be
+true?"* Specifically, it addresses the delta between a traditional site and
+smart-ready sites: places where new bleeding edge building technology is being
+used.
+
+# Key Terms & Definitions
+
+## Building Models
+
+There are different levels of "digital maturity" for different buildings. Each
+one has a slightly different scope in terms of what it means to be "complete."
+For the most part, this document addresses the scope of a Smart Ready building:
+-   **Legacy**: It works, but does not meet requirements or guidelines.
+-   **Compliant**: Meets basic security and networking requirements.
+-   **Smart Ready**: On-prem integrated with the cloud using UDMI & DBO.
+-   **Digital Building**: Completely integrated with back-end services.
+
+## Devices Classification
+
+Various adjectives qualify the different flavors of a "device" present in the
+system. More than one can apply, and each has a specific technical
+meaning/definition (i.e. they are not subjective).
+
+### Connectivity
+
+How data is moved around on-prem
+
+-   **Serial**: The device does not have an IP address, rather uses a wired
+    serial connection.
+-   **Networked**: The device has its own IP address and presence on the wired
+    or wireless IP network.
+-   **Bridged**: The device is on an isolated wired or wireless network behind a
+    gateway device that is networked. 
+
+### Ingestion
+
+How data gets up into the cloud
+
+-   **Direct**: Maintains an authenticated connection directly to Cloud IoT Core.
+    -   Must be networked
+    -   Has a unique private auth key
+-   **Gateway**: A direct device that manages data for other proxied devices.
+    -   Bind & attach of proxied devices
+    -   Encapsulation anti-pattern
+-   **Proxied**: A device that is not direct and is managed through a gateway.
+-   **External**: A device (on-prem or off-prem) consumes data from an external
+    source
+
+### Representation
+
+Device relationships and how they are modeled
+
+-   **Reporting**: Has an entry in Cloud IoT Core and reports telemetry data.
+    -   Reporting connected devices
+    -   Reporting proxied devices
+-   **Logical**: Has a semantic representation in the site building config.
+-   **Virtual**: Logical-but-not-reporting.
+
+## Information Sources
+
+-   **Qualification Summary** - One for each type of networked device
+-   **Digital Building Device Register** - Comprehensive list of all devices on a project
+-   **Site Model** - Any ingestion device (direct, gateway, or proxy)
+-   **Building Config** - Does omit networked devices that don't report
+
+## Cloud IoT Core Definitions
+
+-   Project
+    -   Administrative domain (user auth and billing)
+    -   Can contain multiple registries (buildings)
+-   Registry
+    -   Not the same as the Digital Building Device Register
+    -   One Registry per building site (one site_model, one building config)
+-   Device
+    -   May be direct or proxied
+    -   Maps to a reporting device
+-   Gateway
+    -   Proxies for non-authenticating devices
+    -   Represented in Site Model, but maybe not Building Config
+
+
+# Base Tools & Capabilities
+
+## Device Qualification 
+
+[Device qualification](https://github.com/faucetsdn/daq/blob/master/docs/qualification.md)
+qualifies device types as meeting a baseline connectivity and security
+requirement by performing a series of predefined tests against a device.
+
+### Prerequisites
+
+* Devices are available for qualification
+* [DAQ tool](https://github.com/faucetsdn/daq/) set up for use 
+
+### Verification
+
+* Device qualification configuration and reports for the device available.
+
+## Managed Network 
+
+### Prerequisites
+* Digital building registry is provided 
+
+### Verification
+* ATA validates on-network configuration
+
+## Device Management
+
+All devices which are _smart ready_ are required to support
+[UDMI](../../README.md). For guidance on what compliance with the UDMI schema
+means, refer to [compliance documentation](compliance.md)
+
+### Prerequisites
+
+* [site model](site_model.md) provided and all devices registered into GCP
+* devices are setup in a qualified configuration
+
+### Verification
+
+* [registrar](registrar.md) and [device telemetry validations](validator.md) are clean
+
+## Digital Buildings Ontology
+
+Points and device naming is required to abide by 
+[Digital Buildings Ontology (DBO)](https://github.com/google/digitalbuildings)
+
+### Prerequisites
+
+* [Building Config](https://github.com/google/digitalbuildings/blob/master/ontology/docs/building_config.md) file provided for site
+
+### Verification
+
+* building config passes 
+[DBO validation tools](https://github.com/google/digitalbuildings/tree/master/tools/validators)