added VPN_CLIENT_ID

dap_stream_ch.h

@@ -31,6 +31,7 @@ typedef struct dap_stream_ch dap_stream_ch_t;
 typedef struct dap_events_socket dap_events_socket_t;
 
 #define SERVICE_CHANNEL_ID 's'
+#define VPN_CLIENT_ID SERVICE_CHANNEL_ID
 #define DATA_CHANNEL_ID 'd'
 
 typedef void (*dap_stream_ch_callback_t) (dap_stream_ch_t*,void*);