Function drain_queued_commands 

pub(super) fn drain_queued_commands(
    queued: &mut VecDeque<Command>,
    client: &mut Client<JournaledSession>,
    outbound: &mut PacketWriter<GrowBuffer>,
    pending: &mut Pending,
    max_packet_size: Option<u32>,
    outbound_aliases: &mut OutboundAliases,
    queued_waiting: &mut Vec<Sender<Result<(), Error>>>,
)

Drains commands queued while offline onto a freshly established connection.