CC-StationBroadcast/debug-upcoming-data-missing.md

[OPEN] upcoming-data-missing

Symptom

• Monitor shows NONE / WAITING DATA under UPCOMING TRAINS.
• Expected: list of upcoming trains parsed from CRN advanced display NBT (TrainStops).

Hypotheses (falsifiable)

1. Peripherals.blockReader is not detected (wrong peripheral type string / not connected to this computer).
2. blockReader.getBlockData() succeeds but returns a table without TrainStops (block reader is pointing at the wrong block or advanced display data not present).
3. TrainStops exists but is not an array (non-numeric keys), so ipairs() iteration yields 0 rows.
4. TrainStops exists but the code path exits before assigning State.upcomingTrains.

Evidence to collect (instrumentation)

• Whether blockReader/create_target are detected.
• Whether getBlockData succeeds.
• Whether TrainStops exists and how many rows it contains (ipairs count vs pairs count).

Next action

• Add runtime instrumentation to display these values on the monitor and in logs.