diff --git a/app/assets/protos/WelsonJS.GrpcService.proto b/app/assets/protos/WelsonJS.GrpcService.proto
deleted file mode 100644
index b3b542f..0000000
--- a/app/assets/protos/WelsonJS.GrpcService.proto
+++ /dev/null
@@ -1,15 +0,0 @@
-syntax = "proto3";
-
-option csharp_namespace = "WelsonJS.GrpcService";
-
-service MessageController {
-  rpc SendMessageStream (MessageRequest) returns (stream MessageReply);
-}
-
-message MessageRequest {
-  string clientId = 1;
-}
-
-message MessageReply {
-  string message = 1;
-}
\ No newline at end of file
diff --git a/app/assets/protos/heartbeat.proto b/app/assets/protos/heartbeat.proto
new file mode 100644
index 0000000..0ec3442
--- /dev/null
+++ b/app/assets/protos/heartbeat.proto
@@ -0,0 +1,27 @@
+syntax = "proto3";
+
+option csharp_namespace = "WelsonJS.Service";
+
+package heartbeat;
+
+service HeartbeatService {
+    rpc CheckHeartbeat (stream HeartbeatRequest) returns (stream HeartbeatResponse);
+    rpc FetchPendingEvents (FetchEventsRequest) returns (stream FetchEventsResponse);
+}
+
+message HeartbeatRequest {
+    bool is_alive = 1;
+}
+
+message HeartbeatResponse {
+    bool is_alive = 1;
+}
+
+message FetchEventsRequest {
+    string client_id = 1;
+}
+
+message FetchEventsResponse {
+    string event_type = 1;
+    repeated string args = 2;
+}