How do I sync VARS with new players in a multiplayer game?

I have a project where players can work together for a goal, that goal is dynamic but i do have problems when new players are joining after i limited that goal

what i have right now

- host create a room and wait in the lobby

- players connect using a code generated random and wait in the lobby

- host can press a button to start the game before or after the lobby is full (max 20 players)

- goal is equal to current players*VAR(5)

- start the real game

- all players have the same goal number

my problems

if a new player want to enter in a non full room using the random code they can but they dont have access to the actual goal number, by default they would have VAR(5) and the other player will have a different goal

my options are to limit players or learn how to sync this info all the time

- a way to stop new players to enter in my room, i tried changing my room code but didnt work

- how to share VAR that are changing during the game with new players that are joining to the room after the game started

You can use a common data helper object that is synced, there is a sync instance variable action in the multiplayer object.

You can also have the host broadcast the message with the relevant information whenever it changes or when a new player joins, which is what I would recommend, as this variable is not something that needs to be updated 30 times a second.

You can use a common data helper object that is synced, there is a sync instance variable action in the multiplayer object.

You can also have the host broadcast the message with the relevant information whenever it changes or when a new player joins, which is what I would recommend, as this variable is not something that needs to be updated 30 times a second.

I like the idea but failed to do it

I tried using using a common obj with an instance variable, I added sync obj and sync var, also the broadcast message to do some tests

1st tried

Host press a button (only visible to host) to convert a boolean to true

that boolean (global boolean) set a random number of 4 digits into the instance variable

text on screen show that instace variable to everyone

results

Host can see the random number and peers see the default text

2st

same example but everyone can press the button

results

everyone see a different value but only when they press the button, i need they to see the same value

im not sure in what im failing, i need a dynmic value that can be changed only by the host when is needed and that value share to all players at same time

You probably didn't set it up correctly. Without seeing what you did, I have no idea why you failed either.

You probably didn't set it up correctly. Without seeing what you did, I have no idea why you failed either.

I think i did the most basic of the excersice i guess, players touch the button that is on the top and the number below should change to a random number, that number should be the same in both screen but im failing in something :c