PauseConnections 

Namespace: SynicSugar.P2P
Class: ConnectHub

public async UniTask PauseConnections(bool isForced = false, CancellationTokenSource cancelToken = default(CancellationTokenSource))

Description 

Stop receiving packets to the receive buffer and getting a packet from there.
After call this, the packets will have been dropped until connection will re-open.
To getting restart, call RestartConnections.

If 1st is false, get all packets in current buffer, then stop receiving.
If true, stop receiving a packet to the buffer immediatly.

2nd token is just for this Task instead of PacketReceiver's.

using SynicSugar.P2P;
using Cysharp.Threading.Tasks;

public class p2pSample {
    void ConnectHubSample(){
        ConnectHub.Instance.PauseConnections().Forget();
    }
}