* adding reconnect related messages to jam-pb

src/client_container.proto

@@ -25,6 +25,8 @@ message ClientMessage {
         FRIEND_REQUEST = 112;
         FRIEND_REQUEST_ACCEPTED = 113;
         MUSICIAN_SESSION_JOIN = 114;
+        MUSICIAN_SESSION_FRESH = 115;
+        MUSICIAN_SESSION_STALE = 116;
 
         TEST_SESSION_MESSAGE = 200;
 
@@ -66,6 +68,8 @@ message ClientMessage {
     optional FriendRequest              friend_request = 112;
     optional FriendRequestAccepted      friend_request_accepted = 113;
     optional MusicianSessionJoin        musician_session_join = 114;
+    optional MusicianSessionFresh       musician_session_fresh = 115;
+    optional MusicianSessionStale       musician_session_stale = 116;
 
     // Client-Session messages (to/from)  
     optional TestSessionMessage     test_session_message = 200;
@@ -96,6 +100,8 @@ message Login {
     optional string password = 2; // a password
     optional string token = 3; // a token/cookie from previous successful login attempt or from 'token' field in .music file
     optional string client_id = 4; // if supplied, the server will accept this client_id as the unique Id of this client instance
+    optional string reconnect_music_session_id = 5; // if supplied, the server will attempt to log the client into this session (designed for reconnect scenarios while in-session)
+
 }
 
 // route_to: client
@@ -106,7 +112,8 @@ message LoginAck {
     optional string client_id = 2; // a new client_id if none is supplied in Login, or just the original client_id echoed back
     optional string token = 3; // the remember me token.  This is useful if you logged in with username/password (otherwise it's just 'token' echoed back)
     optional int32  heartbeat_interval = 4; // set your heartbeat interval to this value
-    optional string music_session_id = 5; // users session id if present
+    optional string music_session_id = 5; // the music session that the user was in very recently (likely due to dropped connection)
+    optional bool   reconnected = 6; // if reconnect_music_session_id is specified, and the server could log the user into that session, then true is returned. 
 }
 
 // route_to: server
@@ -166,6 +173,24 @@ message MusicianSessionDepart {
     optional string photo_url = 4;
 }
 
+// route_to: client:
+// sent by server to let the rest of the participants know a client has become active again after going stale 
+message MusicianSessionFresh {
+    optional string session_id = 1; // the session ID
+    optional string user_id = 2; // this is the user_id and can be used for user unicast messages
+    optional string username = 3; // meant to be a display name
+    optional string photo_url = 4;
+}
+
+// route_to: client:
+// sent by server to let the rest of the participants know a user has gone stale (websocket connection dropped) 
+message MusicianSessionStale {
+    optional string session_id = 1; // the session ID
+    optional string user_id = 2; // this is the user_id and can be used for user unicast messages
+    optional string username = 3; // meant to be a display name
+    optional string photo_url = 4;
+}
+
 message JoinRequest {
     optional string join_request_id = 1;
     optional string username = 2;