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continuum-proxy/tests/fixtures/push_status_v2_h2c_printing.json
T
octoturgeandClaude Opus 5 1d95451c4c Fix print.push_status parsing, and stop losing reports silently 
Pointed at a real H2C that was 20% into a job, `print_status()` returned
nothing at all. The printer was in fact pushing a full status object every
second; every one was arriving, failing to deserialize, and being dropped
invisibly by an `if let Ok(report) = ..` with no `else`.

That silence produced two confidently-wrong claims in our own comments,
both corrected here:

- `pushall`'s doc said whether v2 emits `push_status` unprompted was "an
  open question". It is not: v2 pushes a full 97-field object roughly once
  a second from the moment you subscribe, no trigger needed. There is no
  missing "other trigger" to hunt for.
- The "sequence gap" warning blamed the network for dropped v1 updates.
  Those updates were not dropped in transit - they failed to parse, so
  they never reached the counter, making the next one that did look like a
  skip. Confirmed: seq 57, 62, 64 and 69 all arrived. After the fix, zero
  gaps and zero parse failures across a 25s run against both printers.

Two concrete causes, both found with captured payloads:

- v1 trays carry `tray_temp`/`tray_time`; v2 trays carry
  `drying_temp`/`drying_time`. All four were required, so *every* v1 push
  carrying AMS data failed.
- A third tray shape existed that nothing modelled: an empty v2 slot sends
  `{"id": "2", "state": 0}`, which matched neither `EmptyTray` (it denies
  unknown fields, deliberately) nor `LoadedTray` (16 fields short).

A parse failure now reports itself, naming the printer, the sequence id and
the serde error. A report this process cannot parse is a defect in
`PrintReport`, and the only way to fix it is to be told which field.

`PrintReport` itself modelled 9 of 97 top-level fields, and none of them
were progress or temperature - it was built from a truncated example. It
now carries gcode_state, percent, layer counts, remaining time, nozzle/bed
temperatures, fan gears, wifi and HMS entries. `merge_from`'s two dozen
four-line blocks collapse to `newer.x.or(self.x.take())` one-liners: the
old shape made adding a field a three-place edit, and forgetting the merge
half produced a field that silently never survived a partial update.

Two scale traps documented where they bite: reported fan speeds are 0-15
gears, not percent and not the 0-255 PWM we send (`set_fan_speed(50)`
reads back as "7"); and v2 pins `sequence_id` to one value for minutes
while contents change, so it orders and identifies nothing there.

Two examples, and the distinction between them is the point. `live_reports`
is read-only and safe against a printer mid-job. `bambu_idle_checks`
writes, so it requires an explicit printer id and refuses to run unless
that printer reports `gcode_state: "IDLE"`.

Regression fixtures are verbatim captures off both printers, hardware
identifiers scrubbed - the only way to keep this from regressing without a
printer plugged in.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
2026-10-03 10:12:05 +00:00

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{
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}
],
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},
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"gcode_file_prepare_percent": "100",
"gcode_state": "RUNNING",
"heatbreak_fan_speed": "14",
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{
"attr": 83952640,
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},
{
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},
{
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],
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},
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{
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},
{
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}
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],
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"net": {
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"info": [
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{
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}
]
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},
"percent": 13,
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"s_obj": [],
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"ams_new_version_number": "",
"consistency_request": false,
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"err_code": 0,
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"force_upgrade": false,
"idx": 16,
"idx2": 1393374092,
"lower_limit": "00.00.00.00",
"message": "",
"module": "",
"new_version_state": 0,
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"progress": "0",
"sequence_id": 0,
"sn": "31B8BP5A1800585",
"status": "IDLE",
"upgrade_fail_list": [],
"upgrade_type": "unknown"
},
"upload": {
"file_size": 0,
"finish_size": 0,
"message": "Good",
"oss_url": "",
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"sequence_id": "0903",
"speed": 0,
"status": "idle",
"task_id": "",
"time_remaining": 0,
"trouble_id": ""
},
"ver": "20000",
"vir_slot": [
{
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"cols": [
"0ACC38FF"
],
"ctype": 0,
"drying_temp": "0",
"drying_time": "0",
"id": "254",
"nozzle_temp_max": "250",
"nozzle_temp_min": "200",
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"tag_uid": "<scrubbed>",
"total_len": 330000,
"tray_color": "0ACC38FF",
"tray_diameter": "1.75",
"tray_id_name": "",
"tray_info_idx": "GFU98",
"tray_sub_brands": "",
"tray_type": "TPU-AMS",
"tray_uuid": "<scrubbed>",
"tray_weight": "0",
"xcam_info": "000000000000000000000000"
},
{
"bed_temp": "0",
"bed_temp_type": "0",
"cali_idx": -1,
"cols": [
"F95D73FF"
],
"ctype": 0,
"drying_temp": "0",
"drying_time": "0",
"id": "255",
"nozzle_temp_max": "240",
"nozzle_temp_min": "230",
"remain": 0,
"tag_uid": "<scrubbed>",
"total_len": 330000,
"tray_color": "F95D73FF",
"tray_diameter": "1.75",
"tray_id_name": "",
"tray_info_idx": "Pf3dbd0c",
"tray_sub_brands": "",
"tray_type": "TPU",
"tray_uuid": "<scrubbed>",
"tray_weight": "0",
"xcam_info": "000000000000000000000000"
}
],
"wifi_signal": "-66dBm",
"xcam": {
"allow_skip_parts": false,
"buildplate_marker_detector": true,
"cfg": 1797559,
"first_layer_inspector": true,
"halt_print_sensitivity": "medium",
"print_halt": true,
"printing_monitor": true,
"spaghetti_detector": true
},
"xcam_status": "0"
}
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