WIP integration with sdk-test-proxy

TODO can we decrease the 1m 55s this takes to start?
TODO can we reduce the risk of one test case or test run contaminating another?

Resolves #1003.

.github/workflows/emulate.yml

@@ -16,13 +16,19 @@ jobs:
             excludeModules: true
     steps:
       - uses: actions/checkout@v3
+        with:
+          submodules: recursive
 
       # Gradle 7 requires Java 11 to run
       - uses: actions/setup-java@v3
         with:
           distribution: zulu
           java-version: '19'
 
+      - name: Start SDK test proxy server
+        run: cd external/sdk-test-proxy && ./start-service
+        if: matrix.api-level != 21
+
       - uses: reactivecircus/android-emulator-runner@v2
         with:
           api-level: ${{ matrix.api-level }}

.gitmodules

@@ -0,0 +1,3 @@
+[submodule "external/sdk-test-proxy"]
+	path = external/sdk-test-proxy
+	url = [email protected]:ably/sdk-test-proxy.git

CONTRIBUTING.md

@@ -8,6 +8,10 @@ The version of Gradle that this project uses is specified by the `distributionUr
 
 If you are using [`asdf`](https://asdf-vm.com) to manage tool versions, then you can rely on the `.tool-versions` file in this repository, which is configured to use an appropriate version of Java.
 
+## Running the test proxy server
+
+In order to run the `NetworkConnectivityTests`, you will need to be running an instance of the [SDK Test Proxy](https://github.com/ably/sdk-test-proxy) on your development machine. You can do this by executing `./gradlew run` inside the `external/sdk-test-proxy` directory.
+
 ## Development
 
 This repository is structured as a Gradle [Multi-Project Build](https://docs.gradle.org/current/userguide/multi_project_builds.html).

android-test-common/build.gradle

@@ -6,22 +6,17 @@ plugins {
     id 'com.android.library'
     id 'kotlin-android'
     id 'org.jlleitschuh.gradle.ktlint'
+    id 'org.jetbrains.kotlin.plugin.serialization' version "$kotlin_version"
 }
 
 dependencies {
     implementation project(':core-sdk')
     implementation "io.ably:ably-android:$ably_core_version"
 
-    // Ktor dependencies for Layer 7 proxy in NetworkConnectivityTest
-    implementation "io.ktor:ktor-server-websockets:$ktor_version"
-    implementation "io.ktor:ktor-server-cio:$ktor_version"
-    implementation "io.ktor:ktor-server-call-logging:$ktor_version"
     implementation "io.ktor:ktor-client-cio:$ktor_version"
-    implementation "io.ktor:ktor-client-websockets:$ktor_version"
     implementation "io.ktor:ktor-client-logging:$ktor_version"
-    implementation "uk.uuid.slf4j:slf4j-android:1.7.36-0"
 
-    implementation 'org.msgpack:msgpack-core:0.9.3'
+    implementation 'org.jetbrains.kotlinx:kotlinx-serialization-json:1.4.1'
 }
 
 android {