/// <summary>
///
/// </summary>
/// <returns>The server's count of currently available (eg. unused) prekeys for this user.</returns>
/// <exception cref="IOException"></exception>
public async Task <int> GetPreKeysCountAsync(CancellationToken?token = null)
{
if (token == null)
{
token = CancellationToken.None;
}
return(await pushServiceSocket.GetAvailablePreKeysAsync(token));
}