SyncSynic 

Namespace: SynicSugar.P2P
Class: ConnectHub

public async void SyncSynic(UserId targetId, SynicType type, byte syncedPhase = 9, bool syncSinglePhase = false)

    public enum SynicType {
        /// <summary>
        /// Only sender data
        /// </summary>
        OnlySelf,
        /// <summary>
        /// Sender data and (Host) TargetData
        /// </summary>
        WithTarget,
        /// <summary>
        /// Sender data, (Host) TargetData and (Host) Disconencted user Data
        /// </summary>
        WithOthers
    }

Description 

Synchronize all own Synic variables at once to TargetUser.

targetId: Synced target
type: OnlySelf-Send Local Data, WithTarget-Host send target(Reconnecter)'s data, WithOthers-Host send target(Reconnecter)'s and other disconencted users' data. syncedPhase: Sync varaibles from 0 to passed value or only passed value.
syncSinglePhase: If true, sync only varaibles on Synic that have syncedPhase.

using SynicSugar.P2P;
using UnityEngine;

public class p2pSample : MonoBehaviour {
    void Start() {
        p2pInfo.Instance.ConnectionNotifier.Disconnected += OnDisconect;
        p2pInfo.Instance.ConnectionNotifier.Connected += OnConnected;
    }
    void OnDisconect(){
        chatText.text += $"{p2pInfo.Instance.LastDisconnectedUsersId} is Disconnected / {p2pInfo.Instance.LastDisconnectedUsersReason}{System.Environment.NewLine}";
        
    }
    void OnConnected(){
        chatText.text += $"{p2pInfo.Instance.LastDisconnectedUsersId} Join {System.Environment.NewLine}";
        //Send local data
        ConnectHub.Instance.SyncSynic(p2pInfo.Instance.LastConnectedUsersId, SynicType.WithOthers, 0, false);
    }
}