Merge pull request #7159 from jcanizales/p0-connectivity-app

App to manually test behavior under changing connectivity conditions

src/objective-c/tests/Connectivity/Base.lproj/Main.storyboard

@@ -0,0 +1,16 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<document type="com.apple.InterfaceBuilder3.CocoaTouch.Storyboard.XIB" version="3.0" toolsVersion="11129.15" systemVersion="15F34" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" useTraitCollections="YES" colorMatched="YES" initialViewController="BYZ-38-t0r">
+    <dependencies>
+        <deployment identifier="iOS"/>
+        <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="11103.10"/>
+    </dependencies>
+    <scenes>
+        <!--View Controller-->
+        <scene sceneID="tne-QT-ifu">
+            <objects>
+                <viewController id="BYZ-38-t0r" customClass="ViewController" sceneMemberID="viewController"/>
+                <placeholder placeholderIdentifier="IBFirstResponder" id="dkx-z0-nzr" sceneMemberID="firstResponder"/>
+            </objects>
+        </scene>
+    </scenes>
+</document>

src/objective-c/tests/Connectivity/ConnectivityTestingApp.xcodeproj/project.pbxproj

@@ -0,0 +1,353 @@
+// !$*UTF8*$!
+{
+	archiveVersion = 1;
+	classes = {
+	};
+	objectVersion = 46;
+	objects = {
+
+/* Begin PBXBuildFile section */
+		500A4E0AC9D489EB214D1ED4 /* libPods-ConnectivityTestingApp.a in Frameworks */ = {isa = PBXBuildFile; fileRef = C2AF815D8242A2172891621D /* libPods-ConnectivityTestingApp.a */; };
+		63BFB9CC1D2478DD00E17927 /* main.m in Sources */ = {isa = PBXBuildFile; fileRef = 63BFB9CB1D2478DD00E17927 /* main.m */; };
+		63BFB9D21D2478DD00E17927 /* ViewController.m in Sources */ = {isa = PBXBuildFile; fileRef = 63BFB9D11D2478DD00E17927 /* ViewController.m */; };
+		63BFB9D51D2478DD00E17927 /* Main.storyboard in Resources */ = {isa = PBXBuildFile; fileRef = 63BFB9D31D2478DD00E17927 /* Main.storyboard */; };
+/* End PBXBuildFile section */
+
+/* Begin PBXFileReference section */
+		63BFB9C71D2478DD00E17927 /* ConnectivityTestingApp.app */ = {isa = PBXFileReference; explicitFileType = wrapper.application; includeInIndex = 0; path = ConnectivityTestingApp.app; sourceTree = BUILT_PRODUCTS_DIR; };
+		63BFB9CB1D2478DD00E17927 /* main.m */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.objc; path = main.m; sourceTree = SOURCE_ROOT; };
+		63BFB9D11D2478DD00E17927 /* ViewController.m */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.objc; path = ViewController.m; sourceTree = SOURCE_ROOT; };
+		63BFB9D41D2478DD00E17927 /* Base */ = {isa = PBXFileReference; lastKnownFileType = file.storyboard; name = Base; path = Base.lproj/Main.storyboard; sourceTree = "<group>"; };
+		63BFB9DB1D2478DD00E17927 /* Info.plist */ = {isa = PBXFileReference; lastKnownFileType = text.plist.xml; path = Info.plist; sourceTree = SOURCE_ROOT; };
+		BA96CBC1612BD2F70E66246C /* Pods-ConnectivityTestingApp.release.xcconfig */ = {isa = PBXFileReference; includeInIndex = 1; lastKnownFileType = text.xcconfig; name = "Pods-ConnectivityTestingApp.release.xcconfig"; path = "Pods/Target Support Files/Pods-ConnectivityTestingApp/Pods-ConnectivityTestingApp.release.xcconfig"; sourceTree = "<group>"; };
+		C2AF815D8242A2172891621D /* libPods-ConnectivityTestingApp.a */ = {isa = PBXFileReference; explicitFileType = archive.ar; includeInIndex = 0; path = "libPods-ConnectivityTestingApp.a"; sourceTree = BUILT_PRODUCTS_DIR; };
+		FC9BD3AE427396EDB4CD13E3 /* Pods-ConnectivityTestingApp.debug.xcconfig */ = {isa = PBXFileReference; includeInIndex = 1; lastKnownFileType = text.xcconfig; name = "Pods-ConnectivityTestingApp.debug.xcconfig"; path = "Pods/Target Support Files/Pods-ConnectivityTestingApp/Pods-ConnectivityTestingApp.debug.xcconfig"; sourceTree = "<group>"; };
+/* End PBXFileReference section */
+
+/* Begin PBXFrameworksBuildPhase section */
+		63BFB9C41D2478DD00E17927 /* Frameworks */ = {
+			isa = PBXFrameworksBuildPhase;
+			buildActionMask = 2147483647;
+			files = (
+				500A4E0AC9D489EB214D1ED4 /* libPods-ConnectivityTestingApp.a in Frameworks */,
+			);
+			runOnlyForDeploymentPostprocessing = 0;
+		};
+/* End PBXFrameworksBuildPhase section */
+
+/* Begin PBXGroup section */
+		16E6C67F2E48B42376DFFD2A /* Pods */ = {
+			isa = PBXGroup;
+			children = (
+				FC9BD3AE427396EDB4CD13E3 /* Pods-ConnectivityTestingApp.debug.xcconfig */,
+				BA96CBC1612BD2F70E66246C /* Pods-ConnectivityTestingApp.release.xcconfig */,
+			);
+			name = Pods;
+			sourceTree = "<group>";
+		};
+		48F8EC18C66D3416A41F76F5 /* Frameworks */ = {
+			isa = PBXGroup;
+			children = (
+				C2AF815D8242A2172891621D /* libPods-ConnectivityTestingApp.a */,
+			);
+			name = Frameworks;
+			sourceTree = "<group>";
+		};
+		63BFB9BE1D2478DD00E17927 = {
+			isa = PBXGroup;
+			children = (
+				63BFB9D11D2478DD00E17927 /* ViewController.m */,
+				63BFB9D31D2478DD00E17927 /* Main.storyboard */,
+				63BFB9DB1D2478DD00E17927 /* Info.plist */,
+				63BFB9CB1D2478DD00E17927 /* main.m */,
+				63BFB9C81D2478DD00E17927 /* Products */,
+				16E6C67F2E48B42376DFFD2A /* Pods */,
+				48F8EC18C66D3416A41F76F5 /* Frameworks */,
+			);
+			sourceTree = "<group>";
+		};
+		63BFB9C81D2478DD00E17927 /* Products */ = {
+			isa = PBXGroup;
+			children = (
+				63BFB9C71D2478DD00E17927 /* ConnectivityTestingApp.app */,
+			);
+			name = Products;
+			sourceTree = "<group>";
+		};
+/* End PBXGroup section */
+
+/* Begin PBXNativeTarget section */
+		63BFB9C61D2478DD00E17927 /* ConnectivityTestingApp */ = {
+			isa = PBXNativeTarget;
+			buildConfigurationList = 63BFB9DE1D2478DD00E17927 /* Build configuration list for PBXNativeTarget "ConnectivityTestingApp" */;
+			buildPhases = (
+				4DCA2703A0AA5DC1BD2751B8 /* [CP] Check Pods Manifest.lock */,
+				63BFB9C31D2478DD00E17927 /* Sources */,
+				63BFB9C41D2478DD00E17927 /* Frameworks */,
+				63BFB9C51D2478DD00E17927 /* Resources */,
+				8593A2388A8F7BF5A7E98D26 /* [CP] Embed Pods Frameworks */,
+				5347BF6C41E7888C1C05CD88 /* [CP] Copy Pods Resources */,
+			);
+			buildRules = (
+			);
+			dependencies = (
+			);
+			name = ConnectivityTestingApp;
+			productName = ConnectivityTestingApp;
+			productReference = 63BFB9C71D2478DD00E17927 /* ConnectivityTestingApp.app */;
+			productType = "com.apple.product-type.application";
+		};
+/* End PBXNativeTarget section */
+
+/* Begin PBXProject section */
+		63BFB9BF1D2478DD00E17927 /* Project object */ = {
+			isa = PBXProject;
+			attributes = {
+				LastUpgradeCheck = 0800;
+				ORGANIZATIONNAME = gRPC;
+				TargetAttributes = {
+					63BFB9C61D2478DD00E17927 = {
+						CreatedOnToolsVersion = 8.0;
+						DevelopmentTeam = EQHXZ8M8AV;
+						DevelopmentTeamName = "Google, Inc.";
+						ProvisioningStyle = Automatic;
+					};
+				};
+			};
+			buildConfigurationList = 63BFB9C21D2478DD00E17927 /* Build configuration list for PBXProject "ConnectivityTestingApp" */;
+			compatibilityVersion = "Xcode 3.2";
+			developmentRegion = English;
+			hasScannedForEncodings = 0;
+			knownRegions = (
+				en,
+				Base,
+			);
+			mainGroup = 63BFB9BE1D2478DD00E17927;
+			productRefGroup = 63BFB9C81D2478DD00E17927 /* Products */;
+			projectDirPath = "";
+			projectRoot = "";
+			targets = (
+				63BFB9C61D2478DD00E17927 /* ConnectivityTestingApp */,
+			);
+		};
+/* End PBXProject section */
+
+/* Begin PBXResourcesBuildPhase section */
+		63BFB9C51D2478DD00E17927 /* Resources */ = {
+			isa = PBXResourcesBuildPhase;
+			buildActionMask = 2147483647;
+			files = (
+				63BFB9D51D2478DD00E17927 /* Main.storyboard in Resources */,
+			);
+			runOnlyForDeploymentPostprocessing = 0;
+		};
+/* End PBXResourcesBuildPhase section */
+
+/* Begin PBXShellScriptBuildPhase section */
+		4DCA2703A0AA5DC1BD2751B8 /* [CP] Check Pods Manifest.lock */ = {
+			isa = PBXShellScriptBuildPhase;
+			buildActionMask = 2147483647;
+			files = (
+			);
+			inputPaths = (
+			);
+			name = "[CP] Check Pods Manifest.lock";
+			outputPaths = (
+			);
+			runOnlyForDeploymentPostprocessing = 0;
+			shellPath = /bin/sh;
+			shellScript = "diff \"${PODS_ROOT}/../Podfile.lock\" \"${PODS_ROOT}/Manifest.lock\" > /dev/null\nif [[ $? != 0 ]] ; then\n    cat << EOM\nerror: The sandbox is not in sync with the Podfile.lock. Run 'pod install' or update your CocoaPods installation.\nEOM\n    exit 1\nfi\n";
+			showEnvVarsInLog = 0;
+		};
+		5347BF6C41E7888C1C05CD88 /* [CP] Copy Pods Resources */ = {
+			isa = PBXShellScriptBuildPhase;
+			buildActionMask = 2147483647;
+			files = (
+			);
+			inputPaths = (
+			);
+			name = "[CP] Copy Pods Resources";
+			outputPaths = (
+			);
+			runOnlyForDeploymentPostprocessing = 0;
+			shellPath = /bin/sh;
+			shellScript = "\"${SRCROOT}/Pods/Target Support Files/Pods-ConnectivityTestingApp/Pods-ConnectivityTestingApp-resources.sh\"\n";
+			showEnvVarsInLog = 0;
+		};
+		8593A2388A8F7BF5A7E98D26 /* [CP] Embed Pods Frameworks */ = {
+			isa = PBXShellScriptBuildPhase;
+			buildActionMask = 2147483647;
+			files = (
+			);
+			inputPaths = (
+			);
+			name = "[CP] Embed Pods Frameworks";
+			outputPaths = (
+			);
+			runOnlyForDeploymentPostprocessing = 0;
+			shellPath = /bin/sh;
+			shellScript = "\"${SRCROOT}/Pods/Target Support Files/Pods-ConnectivityTestingApp/Pods-ConnectivityTestingApp-frameworks.sh\"\n";
+			showEnvVarsInLog = 0;
+		};
+/* End PBXShellScriptBuildPhase section */
+
+/* Begin PBXSourcesBuildPhase section */
+		63BFB9C31D2478DD00E17927 /* Sources */ = {
+			isa = PBXSourcesBuildPhase;
+			buildActionMask = 2147483647;
+			files = (
+				63BFB9D21D2478DD00E17927 /* ViewController.m in Sources */,
+				63BFB9CC1D2478DD00E17927 /* main.m in Sources */,
+			);
+			runOnlyForDeploymentPostprocessing = 0;
+		};
+/* End PBXSourcesBuildPhase section */
+
+/* Begin PBXVariantGroup section */
+		63BFB9D31D2478DD00E17927 /* Main.storyboard */ = {
+			isa = PBXVariantGroup;
+			children = (
+				63BFB9D41D2478DD00E17927 /* Base */,
+			);
+			name = Main.storyboard;
+			path = .;
+			sourceTree = SOURCE_ROOT;
+		};
+/* End PBXVariantGroup section */
+
+/* Begin XCBuildConfiguration section */
+		63BFB9DC1D2478DD00E17927 /* Debug */ = {
+			isa = XCBuildConfiguration;
+			buildSettings = {
+				ALWAYS_SEARCH_USER_PATHS = NO;
+				CLANG_ANALYZER_NONNULL = YES;
+				CLANG_CXX_LANGUAGE_STANDARD = "gnu++0x";
+				CLANG_CXX_LIBRARY = "libc++";
+				CLANG_ENABLE_MODULES = YES;
+				CLANG_ENABLE_OBJC_ARC = YES;
+				CLANG_WARN_BOOL_CONVERSION = YES;
+				CLANG_WARN_CONSTANT_CONVERSION = YES;
+				CLANG_WARN_DIRECT_OBJC_ISA_USAGE = YES_ERROR;
+				CLANG_WARN_DOCUMENTATION_COMMENTS = YES;
+				CLANG_WARN_EMPTY_BODY = YES;
+				CLANG_WARN_ENUM_CONVERSION = YES;
+				CLANG_WARN_INT_CONVERSION = YES;
+				CLANG_WARN_OBJC_ROOT_CLASS = YES_ERROR;
+				CLANG_WARN_UNREACHABLE_CODE = YES;
+				CLANG_WARN__DUPLICATE_METHOD_MATCH = YES;
+				"CODE_SIGN_IDENTITY[sdk=iphoneos*]" = "iPhone Developer";
+				COPY_PHASE_STRIP = NO;
+				DEBUG_INFORMATION_FORMAT = dwarf;
+				ENABLE_STRICT_OBJC_MSGSEND = YES;
+				ENABLE_TESTABILITY = YES;
+				GCC_C_LANGUAGE_STANDARD = gnu99;
+				GCC_DYNAMIC_NO_PIC = NO;
+				GCC_NO_COMMON_BLOCKS = YES;
+				GCC_OPTIMIZATION_LEVEL = 0;
+				GCC_PREPROCESSOR_DEFINITIONS = (
+					"DEBUG=1",
+					"$(inherited)",
+				);
+				GCC_WARN_64_TO_32_BIT_CONVERSION = YES;
+				GCC_WARN_ABOUT_RETURN_TYPE = YES_ERROR;
+				GCC_WARN_UNDECLARED_SELECTOR = YES;
+				GCC_WARN_UNINITIALIZED_AUTOS = YES_AGGRESSIVE;
+				GCC_WARN_UNUSED_FUNCTION = YES;
+				GCC_WARN_UNUSED_VARIABLE = YES;
+				IPHONEOS_DEPLOYMENT_TARGET = 10.0;
+				MTL_ENABLE_DEBUG_INFO = YES;
+				ONLY_ACTIVE_ARCH = YES;
+				SDKROOT = iphoneos;
+			};
+			name = Debug;
+		};
+		63BFB9DD1D2478DD00E17927 /* Release */ = {
+			isa = XCBuildConfiguration;
+			buildSettings = {
+				ALWAYS_SEARCH_USER_PATHS = NO;
+				CLANG_ANALYZER_NONNULL = YES;
+				CLANG_CXX_LANGUAGE_STANDARD = "gnu++0x";
+				CLANG_CXX_LIBRARY = "libc++";
+				CLANG_ENABLE_MODULES = YES;
+				CLANG_ENABLE_OBJC_ARC = YES;
+				CLANG_WARN_BOOL_CONVERSION = YES;
+				CLANG_WARN_CONSTANT_CONVERSION = YES;
+				CLANG_WARN_DIRECT_OBJC_ISA_USAGE = YES_ERROR;
+				CLANG_WARN_DOCUMENTATION_COMMENTS = YES;
+				CLANG_WARN_EMPTY_BODY = YES;
+				CLANG_WARN_ENUM_CONVERSION = YES;
+				CLANG_WARN_INT_CONVERSION = YES;
+				CLANG_WARN_OBJC_ROOT_CLASS = YES_ERROR;
+				CLANG_WARN_UNREACHABLE_CODE = YES;
+				CLANG_WARN__DUPLICATE_METHOD_MATCH = YES;
+				"CODE_SIGN_IDENTITY[sdk=iphoneos*]" = "iPhone Developer";
+				COPY_PHASE_STRIP = NO;
+				DEBUG_INFORMATION_FORMAT = "dwarf-with-dsym";
+				ENABLE_NS_ASSERTIONS = NO;
+				ENABLE_STRICT_OBJC_MSGSEND = YES;
+				GCC_C_LANGUAGE_STANDARD = gnu99;
+				GCC_NO_COMMON_BLOCKS = YES;
+				GCC_WARN_64_TO_32_BIT_CONVERSION = YES;
+				GCC_WARN_ABOUT_RETURN_TYPE = YES_ERROR;
+				GCC_WARN_UNDECLARED_SELECTOR = YES;
+				GCC_WARN_UNINITIALIZED_AUTOS = YES_AGGRESSIVE;
+				GCC_WARN_UNUSED_FUNCTION = YES;
+				GCC_WARN_UNUSED_VARIABLE = YES;
+				IPHONEOS_DEPLOYMENT_TARGET = 10.0;
+				MTL_ENABLE_DEBUG_INFO = NO;
+				SDKROOT = iphoneos;
+				VALIDATE_PRODUCT = YES;
+			};
+			name = Release;
+		};
+		63BFB9DF1D2478DD00E17927 /* Debug */ = {
+			isa = XCBuildConfiguration;
+			baseConfigurationReference = FC9BD3AE427396EDB4CD13E3 /* Pods-ConnectivityTestingApp.debug.xcconfig */;
+			buildSettings = {
+				ASSETCATALOG_COMPILER_APPICON_NAME = AppIcon;
+				INFOPLIST_FILE = Info.plist;
+				IPHONEOS_DEPLOYMENT_TARGET = 9.3;
+				LD_RUNPATH_SEARCH_PATHS = "$(inherited) @executable_path/Frameworks";
+				PRODUCT_BUNDLE_IDENTIFIER = io.grpc.ConnectivityTestingApp;
+				PRODUCT_NAME = "$(TARGET_NAME)";
+			};
+			name = Debug;
+		};
+		63BFB9E01D2478DD00E17927 /* Release */ = {
+			isa = XCBuildConfiguration;
+			baseConfigurationReference = BA96CBC1612BD2F70E66246C /* Pods-ConnectivityTestingApp.release.xcconfig */;
+			buildSettings = {
+				ASSETCATALOG_COMPILER_APPICON_NAME = AppIcon;
+				INFOPLIST_FILE = Info.plist;
+				IPHONEOS_DEPLOYMENT_TARGET = 9.3;
+				LD_RUNPATH_SEARCH_PATHS = "$(inherited) @executable_path/Frameworks";
+				PRODUCT_BUNDLE_IDENTIFIER = io.grpc.ConnectivityTestingApp;
+				PRODUCT_NAME = "$(TARGET_NAME)";
+			};
+			name = Release;
+		};
+/* End XCBuildConfiguration section */
+
+/* Begin XCConfigurationList section */
+		63BFB9C21D2478DD00E17927 /* Build configuration list for PBXProject "ConnectivityTestingApp" */ = {
+			isa = XCConfigurationList;
+			buildConfigurations = (
+				63BFB9DC1D2478DD00E17927 /* Debug */,
+				63BFB9DD1D2478DD00E17927 /* Release */,
+			);
+			defaultConfigurationIsVisible = 0;
+			defaultConfigurationName = Release;
+		};
+		63BFB9DE1D2478DD00E17927 /* Build configuration list for PBXNativeTarget "ConnectivityTestingApp" */ = {
+			isa = XCConfigurationList;
+			buildConfigurations = (
+				63BFB9DF1D2478DD00E17927 /* Debug */,
+				63BFB9E01D2478DD00E17927 /* Release */,
+			);
+			defaultConfigurationIsVisible = 0;
+			defaultConfigurationName = Release;
+		};
+/* End XCConfigurationList section */
+	};
+	rootObject = 63BFB9BF1D2478DD00E17927 /* Project object */;
+}

src/objective-c/tests/Connectivity/ConnectivityTestingApp.xcodeproj/project.xcworkspace/contents.xcworkspacedata

@@ -0,0 +1,7 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<Workspace
+   version = "1.0">
+   <FileRef
+      location = "self:ConnectivityTestingApp.xcodeproj">
+   </FileRef>
+</Workspace>

src/objective-c/tests/Connectivity/Info.plist

@@ -0,0 +1,40 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>CFBundleDevelopmentRegion</key>
+	<string>en</string>
+	<key>CFBundleExecutable</key>
+	<string>$(EXECUTABLE_NAME)</string>
+	<key>CFBundleIdentifier</key>
+	<string>$(PRODUCT_BUNDLE_IDENTIFIER)</string>
+	<key>CFBundleInfoDictionaryVersion</key>
+	<string>6.0</string>
+	<key>CFBundleName</key>
+	<string>$(PRODUCT_NAME)</string>
+	<key>CFBundlePackageType</key>
+	<string>APPL</string>
+	<key>CFBundleShortVersionString</key>
+	<string>1.0</string>
+	<key>CFBundleSignature</key>
+	<string>????</string>
+	<key>CFBundleVersion</key>
+	<string>1</string>
+	<key>LSRequiresIPhoneOS</key>
+	<true/>
+	<key>UILaunchStoryboardName</key>
+	<string>Main</string>
+	<key>UIMainStoryboardFile</key>
+	<string>Main</string>
+	<key>UIRequiredDeviceCapabilities</key>
+	<array>
+		<string>armv7</string>
+	</array>
+	<key>UISupportedInterfaceOrientations</key>
+	<array>
+		<string>UIInterfaceOrientationPortrait</string>
+		<string>UIInterfaceOrientationLandscapeLeft</string>
+		<string>UIInterfaceOrientationLandscapeRight</string>
+	</array>
+</dict>
+</plist>

src/objective-c/tests/Connectivity/Podfile

@@ -0,0 +1,10 @@
+install! 'cocoapods', :deterministic_uuids => false
+
+# Location of gRPC's repo root relative to this file.
+GRPC_LOCAL_SRC = '../../../..'
+
+target 'ConnectivityTestingApp' do
+  pod 'gRPC', :path => GRPC_LOCAL_SRC
+  pod 'Protobuf', :path => "#{GRPC_LOCAL_SRC}/third_party/protobuf"
+  pod 'BoringSSL', :podspec => "#{GRPC_LOCAL_SRC}/src/objective-c"
+end

src/objective-c/tests/Connectivity/README.md

@@ -0,0 +1,16 @@
+This app can be used to manually test gRPC under changing network conditions.
+
+It makes RPCs in a loop, logging when the request is sent and the response is received.
+
+To test on the simulator, run `pod install`, open the workspace created by Cocoapods, and run the app.
+Once running, disable WiFi (or ethernet) _in your computer_, then enable it again after a while. Don't
+bother with the simulator's WiFi or cell settings, as they have no effect: Simulator apps are just Mac
+apps running within the simulator UI.
+
+The expected result is to never see a "hanged" RPC: success or failure should happen almost immediately
+after sending the request. Symptom of a hanged RPC is a log like the following being the last in your
+console:
+
+```
+2016-06-29 16:51:29.443 ConnectivityTestingApp[73129:3567949] Sending request.
+```

src/objective-c/tests/Connectivity/ViewController.m

@@ -0,0 +1,82 @@
+/*
+ *
+ * Copyright 2016, Google Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following disclaimer
+ * in the documentation and/or other materials provided with the
+ * distribution.
+ *     * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+
+#import <UIKit/UIKit.h>
+
+#import <GRPCClient/GRPCCall.h>
+#import <ProtoRPC/ProtoMethod.h>
+#import <RxLibrary/GRXWriter+Immediate.h>
+#import <RxLibrary/GRXWriter+Transformations.h>
+
+@interface ViewController : UIViewController
+@end
+
+@implementation ViewController
+- (void)viewDidLoad {
+  [super viewDidLoad];
+
+  NSString *host = @"grpc-test.sandbox.googleapis.com";
+
+  GRPCProtoMethod *method = [[GRPCProtoMethod alloc] initWithPackage:@"grpc.testing"
+                                                             service:@"TestService"
+                                                              method:@"StreamingOutputCall"];
+
+  __block void (^startCall)() = ^{
+    GRXWriter *loggingRequestWriter = [[GRXWriter writerWithValue:[NSData data]] map:^id(id value) {
+      NSLog(@"Sending request.");
+      return value;
+    }];
+
+    GRPCCall *call = [[GRPCCall alloc] initWithHost:host
+                                               path:method.HTTPPath
+                                     requestsWriter:loggingRequestWriter];
+
+    [call startWithWriteable:[GRXWriteable writeableWithEventHandler:^(BOOL done, id value,
+                                                                       NSError *error) {
+      if (!done) {
+        return;
+      }
+      if (error) {
+        NSLog(@"Finished with error %@", error);
+      } else {
+        NSLog(@"Finished successfully.");
+      }
+
+      dispatch_time_t oneSecond = dispatch_time(DISPATCH_TIME_NOW, (int64_t)(1 * NSEC_PER_SEC));
+      dispatch_after(oneSecond, dispatch_get_main_queue(), startCall);
+    }]];
+  };
+
+  startCall();
+}
+@end

src/objective-c/tests/Connectivity/main.m

@@ -0,0 +1,46 @@
+/*
+ *
+ * Copyright 2015, Google Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following disclaimer
+ * in the documentation and/or other materials provided with the
+ * distribution.
+ *     * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+
+#import <UIKit/UIKit.h>
+
+@interface AppDelegate : UIResponder <UIApplicationDelegate>
+@property (strong, nonatomic) UIWindow *window;
+@end
+@implementation AppDelegate
+@end
+
+int main(int argc, char * argv[]) {
+  @autoreleasepool {
+      return UIApplicationMain(argc, argv, nil, NSStringFromClass(AppDelegate.class));
+  }
+}