Write a non-blocking byte to a host trigger fifo, to cause a triggered
       scan

def host_trigger_pull(trg_queue, ignore_listener=False):
    '''Write a non-blocking byte to a host trigger fifo, to cause a triggered
       scan'''
    trigger_pull(trg_queue, ignore_listener=ignore_listener,
                 trigger=_c.FSQ_HOSTS_TRIGGER)