IoT MQTT Tests (#966)

* Adds MQTT device tests and example of configuration retrieval

* Fixes compilation

* Changes RSA certs to not expire, updates manager with setConfig, adds tests.

* Updates MQTT client dependency to use latest version from Maven central.

* Removes unused scripts and updates sample quickstart instructions.

* Updates flaky tests in vision beta.

iot/api-client/README.md

@@ -4,35 +4,17 @@ Google Cloud IoT Core platform.
 
 ## Quickstart
 
-1. Install the gCloud CLI as described in [the Cloud IoT Core documentation](https://cloud.google.com/iot/docs/how-tos/getting-started#set_up_the_google_cloud_sdk_and_gcloud).
-2. Create a PubSub topic:
-
-    gcloud beta pubsub topics create projects/my-iot-project/topics/device-events
-
-3. Add the special account `cloud-iot@system.gserviceaccount.com` with the role `Publisher` to that
-PubSub topic from the [Cloud Developer Console](https://console.cloud.google.com)
-or by using the helper script in the [/scripts](./scripts) folder.
-
-4. Create a registry:
-
-    gcloud beta iot registries create my-registry \
-        --project=my-iot-project \
-        --region=us-central1 \
-        --event-pubsub-topic=projects/my-iot-project/topics/device-events
-
-5. Use the [`generate_keys.sh`](generate_keys.sh) script to generate your signing keys:
+1. From the [Google Cloud IoT Core section](https://console.cloud.google.com/iot/)
+   of the Google Cloud console, create a device registry.
+2. Use the [`generate_keys.sh`](generate_keys.sh) script to generate your signing keys:
 
     ./generate_keys.sh
 
-6. Create a device.
+3. Add a device using the file `rsa_cert.pem`, specifying RS256_X509 and using the
+  text copy of the public key starting with the ----START---- block of the certificate.
 
-    gcloud beta iot devices create my-java-device \
-        --project=my-iot-project \
-        --region=us-central1 \
-        --registry=my-registry \
-        --public-key path=rsa_cert.pem,type=rs256
+    cat rsa_cert.pem
 
-7. Connect a sample device using the sample app in the [`mqtt_example`](./mqtt_example) folder.
-8. Learn how to manage devices programatically with the sample app in the
-`manager` folder.
+4. Connect a device using the HTTP or MQTT device samples in the [manager](./manager) folder.
 
+5. Programmattically control device configuration and using the device manager sample in the [manager](./manager) folder.

iot/api-client/manager/README.md

@@ -211,3 +211,56 @@ To publish state messages, run the sample as follows:
     gcloud beta pubsub subscriptions pull --auto-ack \
         projects/my-iot-project/subscriptions/my-subscription
 ```
+
+# Cloud IoT Core Java MQTT example
+
+This sample app publishes data to Cloud Pub/Sub using the MQTT bridge provided
+as part of Google Cloud IoT Core.
+
+Note that before you can run the sample, you must configure a Google Cloud
+PubSub topic for Cloud IoT Core and register a device as described in the
+[parent README](../README.md).
+
+## Setup
+
+Run the following command to install the dependencies using Maven:
+
+    mvn clean compile
+
+## Running the sample
+
+The following command summarizes the sample usage:
+
+    mvn exec:java \
+        -Dexec.mainClass="com.example.cloud.iot.examples.MqttExample" \
+        -Dexec.args="-project_id=my-iot-project \
+                     -registry_id=my-registry \
+                     -device_id=my-device \
+                     -private_key_file=rsa_private_pkcs8 \
+                     -algorithm=RS256"
+
+For example, if your project ID is `blue-jet-123`, your service account
+credentials are stored in your home folder in creds.json and you have generated
+your credentials using the [`generate_keys.sh`](../generate_keys.sh) script
+provided in the parent folder, you can run the sample as:
+
+    mvn exec:java \
+        -Dexec.mainClass="com.example.cloud.iot.examples.MqttExample" \
+        -Dexec.args="-project_id=blue-jet-123 \
+                     -registry_id=my-registry \
+                     -device_id=my-device \
+                     -private_key_file=../rsa_private_pkcs8 \
+                     -algorithm=RS256"
+
+## Reading the messages written by the sample client
+
+1. Create a subscription to your topic.
+
+    gcloud beta pubsub subscriptions create \
+        projects/your-project-id/subscriptions/my-subscription \
+        --topic device-events
+
+2. Read messages published to the topic
+
+    gcloud beta pubsub subscriptions pull --auto-ack \
+        projects/my-iot-project/subscriptions/my-subscription

iot/api-client/manager/pom.xml

@@ -37,6 +37,11 @@
   </properties>
 
   <dependencies>
+    <dependency>
+      <groupId>org.eclipse.paho</groupId>
+      <artifactId>org.eclipse.paho.client.mqttv3</artifactId>
+      <version>1.2.0</version>
+    </dependency>
     <dependency>
       <groupId>org.json</groupId>
       <artifactId>json</artifactId>

iot/api-client/manager/resources/rsa_cert.pem

@@ -1,18 +1,18 @@
 -----BEGIN CERTIFICATE-----
-MIIC+DCCAeCgAwIBAgIJAMLUy4Aee8f0MA0GCSqGSIb3DQEBCwUAMBExDzANBgNV
-BAMMBnVudXNlZDAeFw0xNzEyMTIyMDQ3MTNaFw0xODAxMTEyMDQ3MTNaMBExDzAN
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+cDZqe/pJ3fktbh1+HTkFC+tnfu3AhBPcL+sNVOQWn1+osBjVx51mIY6s4Ks=
 -----END CERTIFICATE-----

iot/api-client/manager/resources/rsa_private.pem

@@ -1,28 +1,28 @@
 -----BEGIN PRIVATE KEY-----
-MIIEvgIBADANBgkqhkiG9w0BAQEFAASCBKgwggSkAgEAAoIBAQDdWhkFaxeyeXKe
-2Sa2pfuzIGH5jmiuDq+bETmVRSMRuNL3o1hyxMAH+Pch1h8yXacWLqrwg4gSnLfo
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 -----END PRIVATE KEY-----