FAQ Update

documents/FAQ.md

@@ -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?
 
@@ -28,14 +29,14 @@ To enable logging in the samples, you will need to set the following system prop
 ```
 
 * `aws.crt.debugnative`: Whether to debug native (C/C++) code. Can be either `true` or `false`.
-* `aws.crt.log.destination`: Where the logs are outputted to. Can be `File`, `Stdout` or `Stderr`. Defaults to `Stderr`.
+* `aws.crt.log.destination`: Where the logs are output to. Can be `File`, `Stdout`, or `Stderr`. Defaults to `Stderr`.
 * `aws.crt.log.level`: The level of logging shown. Can be `Trace`, `Debug`, `Info`, `Warn`, `Error`, `Fatal`, or `None`. Defaults to `Warn`.
 * `aws.crt.log.filename`: The path to save the log file. Only needed if `aws.crt.log.destination` is set to `File`.
 
 For example, to run `BasicPubSub` with logging you could use the following:
 
 ```sh
-mvn compile exec:java -pl samples/Mqtt/Mqtt5X509 -Daws.crt.debugnative=true -Daws.crt.log.level=Debug -Daws.crt.log.destionation=Stdout -Dexec.mainClass=pubsub.PubSub -Dexec.args='--endpoint <endpoint> --cert <path to cert> --key <path to key>'
+mvn compile exec:java -pl samples/Mqtt/Mqtt5X509 -Daws.crt.debugnative=true -Daws.crt.log.level=Debug -Daws.crt.log.destination=Stdout -Dexec.mainClass=pubsub.PubSub -Dexec.args='--endpoint <endpoint> --cert <path to cert> --key <path to key>'
 ```
 
 You can also enable [CloudWatch logging](https://docs.aws.amazon.com/iot/latest/developerguide/cloud-watch-logs.html) for IoT which will provide you with additional information that is not available on the client side sdk.
@@ -55,7 +56,7 @@ System.out.println(CRT.awsErrorString(errorCode));
 
 ### I keep getting AWS_ERROR_MQTT_UNEXPECTED_HANGUP
 
-This could be many different things but it most likely is a policy issue. Start with using a super permissive IAM policy called AWSIOTFullAccess which looks like this:
+This could be many different things, but it is most likely a policy issue. Start by using a super permissive IAM policy called AWSIOTFullAccess which looks like this:
 
 ``` json
 {
@@ -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