Cloud iot core (#946)

* Initial commit.

* Changes oauth2 client

* Fixes google.auth and addresses changes in v1beta1

Author: gguuss

iot/api-client/README.md

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+# Cloud IoT Core Python Samples
+This folder contains Python samples that demonstrate an overview of the
+Google Cloud IoT Core platform.
+
+## Quickstart
+1. Install the gCloud CLI as described in [the device manager guide](https://cloud.google.com/iot/docs/device_manager_guide).
+2. Create a PubSub topic:
+
+    gcloud beta pubsub topics create projects/my-iot-project/topics/device-events
+
+3. Add the service account `[email protected]` to that
+PubSub topic from the [Cloud Developer Console](https://console.cloud.google.com)
+or by using the helper script in the /scripts folder.
+
+4. Create a registry:
+
+    gcloud alpha iot registries create my-registry \
+        --project=my-iot-project \
+        --region=us-central1 \
+        --pubsub-topic=projects/my-iot-project/topics/device-events
+
+5. Use the `generate_keys.sh` script to generate your signing keys:
+
+    ./generate_keys.sh
+
+6. Register a device:
+
+    gcloud alpha iot devices create my-python-device \
+        --project=my-iot-project \
+        --region=us-central1 \
+        --registry=my-registry \
+        --public-key path=rsa_cert.pem,type=rs256
+
+7. Connect a sample device using the sample app in the `mqtt_example` folder.
+8. Learn how to manage devices programatically with the sample app in the
+`manager` folder.
+

iot/api-client/generate_keys.sh

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+#!/bin/bash
+
+# Copyright 2017 Google Inc.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+openssl req -x509 -newkey rsa:2048 -keyout rsa_private.pem -nodes -out \
+    rsa_cert.pem -subj "/CN=unused"
+openssl ecparam -genkey -name prime256v1 -noout -out ec_private.pem
+openssl ec -in ec_private.pem -pubout -out ec_public.pem

iot/api-client/manager/README.md

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+# Cloud IoT Core Device Manager Python Sample
+
+This sample application shows you how to manage devices programmatically using
+Python.
+
+
+# Setup
+
+1. Use virtualenv to create a local Python environment.
+
+    virtualenv env && source env/bin/activate
+
+2. Install the dependencies
+
+    pip install -r requirements.txt
+
+
+# Running the sample
+
+The following snippet summarizes usage for the device manager sample:
+
+    usage: cloudiot_device_manager_example.py [-h] \
+        --project_id PROJECT_ID \
+        --pubsub_topic PUBSUB_TOPIC \
+        --api_key API_KEY \
+        [--ec_public_key_file EC_PUBLIC_KEY_FILE] \
+        [--rsa_certificate_file RSA_CERTIFICATE_FILE] \
+        [--cloud_region CLOUD_REGION] \
+        [--service_account_json SERVICE_ACCOUNT_JSON] \
+        [--registry_id REGISTRY_ID]
+
+
+For example, if your project-id is `blue-jet-123` and your service account
+credentials are stored in `creds.json` in your home folder, the following
+command would run the sample:
+
+    python cloudiot_device_manager_example.py \
+      --project_id blue-jet-123 \
+      --pubsub_topic projects/blue-jet-123/topics/device-events \
+      --ec_public_key ../ec_public.pem \
+      --rsa_certificate_file ../rsa_cert.pem \
+      --api_key YOUR_API_KEY \
+      --service_account_json $HOME/creds.json