BambuHelper v2.3 Release Notes

AMS filament indicator (NEW)

• Active filament on screen - colored dot + filament type (e.g. "PLA Matte") shown on the bottom bar during PRINTING and IDLE screens
• Works with all AMS units (up to 4 units, 16 trays) and external spool (vt_tray)
• Black filament visibility - gray outline around the color dot so it's visible on dark backgrounds
• Falls back to WiFi signal display when no AMS is present or no tray is active
• Data parsed from MQTT pushall using memmem() raw scan (same proven pattern as H2C dual nozzle)

Smooth gauge animations (NEW)

• Smooth arc transitions - gauge arcs interpolate smoothly to new values instead of jumping instantly
• Text values update immediately (no delay), only the arc animates
• Exponential smoothing at 4Hz with ~1s settle time

Gauge flicker elimination

• Text cache system - gauge center is only cleared and redrawn when the displayed text actually changes (e.g. "220" to "221"), not on every MQTT update
• Transparent text rendering - text inside gauges uses transparent background to avoid rectangular artifacts overlapping the arc
• Bottom bar WiFi filter - WiFi RSSI noise no longer triggers bottom bar redraws when AMS filament indicator is shown instead

Buzzer improvements

• Test buzzer button - cycle through all sounds (Print Finished, Error, Connected) directly from the web UI
• Section renamed - "Multi-Printer" section renamed to "Hardware & Multi-Printer" for discoverability

Display improvements

• Larger gauge labels - gauge labels ("Nozzle", "Part", etc.) upgraded from Font 1 (8px) to Font 2 (16px), positioned closer to the gauge arc
• Smaller labels option - checkbox in Display settings to revert to the original smaller labels
• Animated progress bar default - shimmer effect now enabled by default
• Bottom bar font upgrade - bottom status bar changed from Font 1 (8px) to Font 2 (16px) for better readability
• Default background color - changed from dark navy (0x0861) to black (0x0000)
• Multi-printer no longer beta - removed BETA tag from multi-printer support

Cloud MQTT stability fix (IMPORTANT)

• Fixed cloud reconnect loop - cloud printers (H2C, H2D, H2S, P2S) could enter a disconnect/reconnect cycle every 5-100 seconds with TLS error 49 (access_denied). Root cause: static MQTT client ID caused session collisions on the Bambu Cloud broker when the previous TLS session hadn't fully closed server-side
• Random client ID for cloud - each cloud connection now uses a unique random client ID (like pybambu/Home Assistant), preventing broker session conflicts
• Clean TLS on cloud reconnect - TLS and MQTT objects are fully destroyed and recreated before each cloud reconnect, eliminating stale session state
• Initial-only pushall for cloud - cloud sends one pushall request after connecting (for immediate full status), but no periodic pushall - cloud broker pushes updates automatically and repeated publishing could trigger access_denied
• Instant first connection - removed unnecessary 30s delay before the first cloud reconnect attempt, reducing initial connection time from ~23s to ~3s
• Smart backoff - connections lasting less than 30s no longer reset the backoff counter, preventing aggressive reconnect spam when the broker is rejecting connections
• Cloud reconnect interval 30s - increased from 10s to reduce broker rate limit risk
• CA certificate bundle for cloud - cloud TLS now uses proper certificate verification instead of setInsecure()
• Disconnect diagnostics - logs PubSubClient rc code, TLS error, connection duration, and message count on every disconnect for easier debugging

Connecting screen improvements

• Slide bar animation - replaced the rotating arc spinner with a smooth sliding progress bar on both WiFi and MQTT connecting screens (fixes visual glitch where the arc would briefly show as a full circle during wrap-around)

Display fixes

• Pong clock text size bug - switching from Pong clock to printer dashboard no longer shows garbled oversized text (tft.setTextSize was not reset)
• ETA fallback fix - ETA display no longer intermittently falls back to "Remaining: Xh XXm" after DST implementation (race condition in getLocalTime with timeout 0)
• Finish buzzer repeating on rotation - buzzer no longer replays the "print finished" sound every time the display rotates back to a finished printer (per-printer flag, reset on next print start)
• Gauge text cache overflow - increased cache from 8 to 12 slots to cover all screen layouts (printing: 6, idle: 2, finished: 2), preventing occasional gauge flicker on screen transitions
• Gauge text cache null-terminator - fixed missing null-terminator in force-redraw path that could cause stale text comparison reads past buffer
• Smooth animation float comparison - replaced exact float != with epsilon-based comparison to prevent edge-case animation jitter

Code quality improvements

• MQTT parser bounds checks - added payload boundary validation to whitespace-skip loops after memmem() raw scans (extruder, ams, vt_tray parsing)
• Safe string copies - replaced strcpy/strncpy with strlcpy for gcodeState initialization and gauge text cache
• Goto removal - refactored goto wifi_fallback in bottom status bar to a helper function