Sequencer tries to configure next exposure before previous is complete

[astronomerdave]

See for example, in sequencerd_20260130.log:

2026-01-30T02:47:14.390  (Sequencer::Sequence::camera_set) ERROR sending "exptime 0": ERROR
2026-01-30T02:47:14.390  (Sequencer::Sequence::broadcast_waitstate) WAITSTATE: CAMERA SLIT
2026-01-30T02:47:14.390  (Sequencer::Sequence::slit_set) moving slit to set 0 0 for DATABASEposition
2026-01-30T02:47:14.390  (Sequencer::Sequence::broadcast_waitstate) WAITSTATE: SLIT
2026-01-30T02:47:14.391  (Sequencer::Sequence::sequence_start) ERROR: worker camera_set exception: camera returned ERROR
2026-01-30T02:47:14.391  (Sequencer::Sequence::broadcast_waitstate) WAITSTATE: CALIB SLIT

and the corresponding error in camerad_20260130.log:

2026-01-30T02:47:14.390  (Camera::doit) thread 0 received command on fd 6 (160) : exptime 0
2026-01-30T02:47:14.390  (AstroCam::Interface::do_exptime) ERROR: cannot change exposure time while reading out chan I R U
2026-01-30T02:47:14.390  (Camera::doit) command (160) reply: ERROR

The sequencer otherwise handled the error properly.

[astronomerdave]

camerad is correctly notifying when it is ready:
2026-01-30T02:47:23.664 (AstroCam::Interface::dothread_monitor_exposure_pending) NOTICE:ready for next exposure

but apparently the sequencer didn't see that.