chore: retire IoT samples

iot/mqtt-ciotc/README.md

@@ -1,84 +1,7 @@
-# Message Queue Telemetry Transport (MQTT) client for Google Cloud IoT Core
+# Deprecation Notice
 
-This sample app demonstrates connecting to Google Cloud IoT Core and publishing
-a single message.
+* <h3>Google Cloud IoT Core will be <a href="https://cloud.google.com/iot/docs/release-notes#August_16_2022">retired as of August 16, 2023</a>.</h3>
 
-## Building
+* <h3>Hence, the samples in this directory are archived and are no longer maintained.</h3>
 
-This example uses `vcpkg` and `CMake` to manage its dependencies. To compile this project:
-
-1. **Install vcpkg.**
-   Clone the vcpkg repository to your preferred location. In these instructions we use`$HOME`:
-   ```shell
-   git clone -C $HOME https://github.com/microsoft/vcpkg.git
-   ```
-
-1. **Download or clone this repo** with
-   ```shell
-   git clone https://github.com/GoogleCloudPlatform/cpp-samples
-   ```
-
-1. **Compile this example:**
-   Use the `vcpkg` toolchain file to download and compile dependencies. This file would be in the directory you
-   cloned `vcpkg` into, `$HOME/vcpkg` if you are following the instructions to the letter. Note that building all the
-   dependencies may take several minutes, up to half an hour, depending on the performance of your workstation. These dependencies are cached,
-   so a second build should be substantially faster.
-   ```sh
-   cd cpp-samples/iot/mqtt-ciotc
-   cmake -S. -B.build -DCMAKE_TOOLCHAIN_FILE=$HOME/vcpkg/scripts/buildsystems/vcpkg.cmake
-   cmake --build .build
-   ```
-
-# Running
-
-After you have successfully built the sample, you are almost ready to run the
-sample.
-
-1. Browse to the sample folder
-    ```shell
-    cd mqtt-ciotc
-    ```
-
-1. Create a Cloud Pub/Sub topic
-   ```shell
-   gcloud pubsub topics create <Your telemetry topic>
-   ```
-
-1. Setup the Cloud IOT environment
-   ```shell
-    ./setup_device.sh --registry-name <Your registry id> \
-      --registry-region <e.g. us-central1> \
-      --device-id <Your device ID> \
-      --telemetry-topic <Your telemetry Cloud Pub/Sub topic>
-   ```
-
-1. Run the sample
-   ```shell
-    ./mqtt_ciotc <message> \
-        --deviceid <your device id>\
-        --region <e.g. us-central1>\
-        --registryid <your registry id>\
-        --projectid <your project id>\
-        --keypath <e.g. ./ec_private.pem>\
-        --algorithm <e.g. RS256>
-        --rootpath <e.g. ./roots.pem>
-   ```
-
-You must provide the deviceid, registryid, and projectid parameters as they are
-used in calculating the client ID used for connecting to the MQTT bridge. The
-ecpath parameter should point to your private EC key created when you registered
-your device. The rootpath parameter specifies the roots.pem file that can be
-downloaded from https://pki.google.com/roots.pem. For example:
-
-   ```shell
-   wget https://pki.google.com/roots.pem
-   ```
-
-The following example demonstrates usage of the sample if my device ID is
-my-device, registry ID is my-registry, and project ID is blue-ocean-123.
-
-   ```shell
-    mqtt_ciotc "Hello world!" --deviceid my-device --registryid my-registry \
-        --projectid blue-ocean-123 --keypath ./rsa_private.pem --algorithm RS256 \
-         --rootpath ./roots.pem --region us-central1    
-   ```
+* <h3>If you are customer with an assigned Google Cloud account team, contact your account team for more information.</h3>