Let a job choose its AMS slot; soak test for telemetry

POST /jobs takes an optional amsSlot (stored in the job metadata) which
dispatch passes to the gateway. The camera e2e script gains SOAK_S.

scripts/e2e-camera-snapshot.sh

@@ -148,6 +148,19 @@ if grep -qi 'access_code\|accessCode' "$WORK/backend.log"; then
 fi
 ok "the backend log never mentions an access code"
 
+# Optional soak: the first real dispatch froze the proxy ~4.5 min in (an
+# MQTT publish that never completed while the fleet lock was held). Staying
+# connected well past that and still receiving telemetry is the regression test.
+if [ -n "${SOAK_S:-}" ]; then
+  echo "==> soaking for ${SOAK_S}s: telemetry must keep arriving"
+  sleep "$SOAK_S"
+  AGE="$(psql_q "SELECT extract(epoch FROM now() - last_seen_at)::int FROM printers WHERE id='$CAM_UUID'")"
+  [ -n "$AGE" ] && [ "$AGE" -lt 20 ] || fail "telemetry is ${AGE:-never}s old after the soak - the proxy froze"
+  ok "telemetry still fresh (${AGE}s old) after ${SOAK_S}s"
+  code="$(fetch "$WORK/after.jpg")"; [ "$code" = 200 ] || fail "no camera frame after the soak: HTTP $code"
+  ok "camera still answers after the soak"
+fi
+
 [ -n "$SAVE_FRAME" ] && cp "$WORK/f2.jpg" "$SAVE_FRAME" && ok "kept a frame at $SAVE_FRAME"
 echo
 echo "PASS - a P1/A1 camera frame travelled printer -> proxy -> backend -> an authenticated viewer."

scripts/real-print-p1p.sh

@@ -20,6 +20,8 @@ REPO_ROOT="$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)"
 cd "$REPO_ROOT"
 PRINTER_ID="${PRINTER_ID:-p1p}"
 FILE="${FILE:-auto-test-001.gcode.3mf}"
+# 0-based across all AMS units (AMS1 slot 4 is 3). Unset: map by the project's filament.
+AMS_SLOT="${AMS_SLOT:-}"
 PROXY_DIR="${PROXY_DIR:-$REPO_ROOT/../continuum-proxy}"
 GO2RTC_BIN="${GO2RTC_BIN:-$HOME/.local/bin/go2rtc}"
 PORT="${PORT:-3060}"; AUTH_PORT="${AUTH_PORT:-3061}"
@@ -107,7 +109,7 @@ ok "the cloud sees $PRINTER_ID idle"
 
 echo "==> queueing the job"
 J="$(curl -sf -X POST "$BASE/jobs" -H "authorization: Bearer $TOKEN" -H 'content-type: application/json' \
-  -d "{\"farmId\":\"$FARM_ID\",\"fileName\":\"$FILE\",\"contentType\":\"application/octet-stream\"}")"
+  -d "{\"farmId\":\"$FARM_ID\",\"fileName\":\"$FILE\",\"contentType\":\"application/octet-stream\"${AMS_SLOT:+,\"amsSlot\":$AMS_SLOT}}")"
 JOB_ID="$(printf '%s' "$J" | python3 -c 'import json,sys; print(json.load(sys.stdin)["job"]["id"])')"
 OBJECT_KEY="$(printf '%s' "$J" | python3 -c 'import json,sys; print(json.load(sys.stdin)["job"]["r2ObjectKey"])')"
 UPLOAD_URL="$(printf '%s' "$J" | python3 -c 'import json,sys; print(json.load(sys.stdin)["uploadUrl"])')"

src/dispatch/index.ts

@@ -213,6 +213,8 @@ export async function dispatchTick(): Promise<number> {
         job_id: job.id,
         file_name: job.fileName,
         url,
+        // Chosen by whoever queued the job; absent means "by the project's filament".
+        ...(typeof job.metadata?.amsSlot === "number" ? { ams_slot: job.metadata.amsSlot } : {}),
       });
 
       if (!result.ok) {

src/routes/jobs.ts

@@ -73,6 +73,7 @@ export const jobRoutes = new Elysia({ prefix: "/jobs" })
           farmId: body.farmId,
           fileName: body.fileName,
           r2ObjectKey,
+          metadata: body.amsSlot === undefined ? {} : { amsSlot: body.amsSlot },
           // From the verified token, never from the body. It used to be a
           // `submittedBy` field the caller filled in, which made the audit
           // trail a suggestion rather than a record.
@@ -89,6 +90,9 @@ export const jobRoutes = new Elysia({ prefix: "/jobs" })
         farmId: t.String({ format: "uuid" }),
         fileName: t.String({ minLength: 1, maxLength: 500 }),
         contentType: t.Optional(t.String()),
+        // 0-based across all AMS units (AMS1 slot 4 is 3). Absent: the
+        // gateway maps by the project's own filament.
+        amsSlot: t.Optional(t.Integer({ minimum: 0, maximum: 15 })),
       }),
       detail: { tags: ["jobs"], summary: "Queue a print job and get an upload URL" },
     },