Fix GreenGrass discovery (#55)

Author: graebm

discovery/source/DiscoveryClient.cpp

@@ -124,12 +124,12 @@ namespace Aws
                                 DiscoverResponse response(jsonObject.View());
                                 onDiscoverResponse(&response, AWS_ERROR_SUCCESS, callbackContext->responseCode);
                             }
-                            else if (errorCode)
-                            {
-                                onDiscoverResponse(nullptr, errorCode, callbackContext->responseCode);
-                            }
                             else
                             {
+                                if (!errorCode)
+                                {
+                                    errorCode = AWS_ERROR_UNKNOWN;
+                                }
                                 onDiscoverResponse(nullptr, errorCode, callbackContext->responseCode);
                             }
 

samples/greengrass/basic_discovery/main.cpp

@@ -189,7 +189,7 @@ int main(int argc, char *argv[])
 
             connection = mqttClient.NewConnection(
                 Aws::Iot::MqttClientConnectionConfigBuilder(certificatePath.c_str(), keyPath.c_str())
-                    .WithCertificateAuthority(groupToUse.CAs->at(0).c_str())
+                    .WithCertificateAuthority(ByteCursorFromCString(groupToUse.CAs->at(0).c_str()))
                     .WithPortOverride(connectivityInfo.Port.value())
                     .WithEndpoint(connectivityInfo.HostAddress.value())
                     .Build());