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merged 4 commits into from
Oct 15, 2025
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FAQ Update #666

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update faq with crt classifiers
xiazhvera Oct 3, 2025
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update faq content table
xiazhvera Oct 3, 2025
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typo and grammar in faq
xiazhvera Oct 14, 2025
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update cr comments
xiazhvera Oct 15, 2025
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36 changes: 36 additions & 0 deletions documents/FAQ.md
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Expand Up @@ -11,6 +11,7 @@
* [How do I build and use the Android SDK?](#how-do-i-build-and-use-the-android-sdk)
* [Where can I find MQTT 311 Samples?](#where-can-i-find-mqtt-311-samples)
* [I still have more questions about this sdk?](#i-still-have-more-questions-about-this-sdk)
* [How can I improve the library size? ](#how-can-i-improve-the-library-size)

### Where should I start?

Expand Down Expand Up @@ -123,6 +124,41 @@ Instructions for building, installing, and use of the Android SDK can be found [
### Where can I find MQTT 311 Samples?
The MQTT 311 Samples can be found in the v1.27.2 samples folder [here](https://github.com/aws/aws-iot-device-sdk-java-v2/tree/v1.27.2/samples)

### How can I improve the library size?

The SDK depends on aws-crt-java, which includes native binaries for multiple platforms (~50MB total). Here are two approaches to reduce size:

#### Option 1: Use Platform-Specific Dependencies

Use classifiers to include only your target platform's binaries:

```xml
<dependency>
<groupId>software.amazon.awssdk.crt</groupId>
<artifactId>aws-crt</artifactId>
<version>0.39.0</version>
<classifier>linux-x86_64</classifier> <!-- Only Linux 64-bit -->
</dependency>
```

See [all available classifiers](https://github.com/awslabs/aws-crt-java/tree/main?tab=readme-ov-file#available-classifiers).

#### Option 2: Build from Source

For maximum control, build both CRT and SDK locally:

1. [Build aws-crt-java from source](https://github.com/awslabs/aws-crt-java/tree/main?tab=readme-ov-file#platform)
2. Update `sdk/pom.xml` to use local aws-crt build:
```xml
<dependency>
<groupId>software.amazon.awssdk.crt</groupId>
<artifactId>aws-crt</artifactId>
<version>1.0.0-SNAPSHOT</version>
</dependency>
```
3. [Build the SDK from source](./DEVELOPING.md#building-from-source)


### I still have more questions about this sdk?

* [Here](https://docs.aws.amazon.com/iot/latest/developerguide/what-is-aws-iot.html) are the AWS IoT Core docs for more details about IoT Core
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