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Jul 15, 2021
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Update samples/README.md for GG IPC #298

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Expand Up @@ -347,4 +347,6 @@ This sample is intended for direct usage with the Greengrass Discovery tutorial

## Greengrass IPC

This sample is intended for direct usage with the Greengrass IPC tutorial found [here](https://docs.aws.amazon.com/greengrass/v2/developerguide/ipc-iot-core-mqtt.html).
This sample must be run from within a Greengrass V2 component using an appropriate policy to perform `aws.greengrass#PublishToIoTCore` and `aws.greengrass#SubscribeToIoTCore` operations on `test/topic` or any other topic passed as a CLI argument.

For more information about Greengrass interprocess communication (IPC), see [here](https://docs.aws.amazon.com/greengrass/v2/developerguide/interprocess-communication.html). This sample uses IPC to perform [IoT Core MQTT operations](https://docs.aws.amazon.com/greengrass/v2/developerguide/ipc-iot-core-mqtt.html).