重命名包 client 为 edge；重命名包 server 为 gateway

edge/core/consts.go

@@ -0,0 +1,9 @@
+package core
+
+const Version byte = 1
+
+const FwdCtrlPort uint = 18080
+const FwdDataPort uint = 18081
+
+const RetryInterval uint = 5
+const HeartbeatInterval uint = 30