Handle keep alive in signal server

keepalive/client.go

@@ -0,0 +1,5 @@
+package keepalive
+
+func IsKeepAliveMsg(body []byte) bool {
+	return len(body) == 0
+}

keepalive/keep_alive.go

@@ -11,8 +11,9 @@ import (
 )
 
 const (
+	GrpcVersionHeaderKey = "version"
+
 	reversProxyHeaderKey = "x-netbird-peer"
-	grpcVersionHeaderKey = "version"
 	keepAliveInterval    = 30 * time.Second
 )
 
@@ -112,7 +113,7 @@ func (k *KeepAlive) keepAliveIsSupported(ctx context.Context) (string, bool) {
 		return "", false
 	}
 
-	if len(md.Get(grpcVersionHeaderKey)) == 0 {
+	if len(md.Get(GrpcVersionHeaderKey)) == 0 {
 		log.Debugf("version info not found")
 		return "", false
 	}