FAQ
TL;DR: Use Zigbee 3.0 for the first build: it is mature, ESP32-C6 already supports it, and a single CC2652P-based dongle in the attic can route ≥ 200 nodes when you add powered router modules throughout the house [Zigbee Alliance, 2023]. Keep Home Assistant on 4 GB RAM; 16 GB is surplus [Home Assistant Docs, 2024]. Pull CAT 6A + PoE to every switch box; it simplifies backup power and later Matter upgrades [Elektroda, Mavannkas, post #21440918]
Quick Facts
• Zigbee 3.0 mesh size: 1 coordinator + 20-50 direct children, up to 240 total nodes with routers [Zigbee Alliance, 2023]
• ESP32-C6: Wi-Fi 6, BLE 5, 802.15.4 (Zigbee/Thread); 320 kB SRAM, 4 MB flash typical [Espressif Datasheet, 2023]
• PoE (802.3af) budget: 48 V DC, 13 W per port; mid-span injectors €15–25 [Cisco Design Guide, 2024]
• Home Assistant OS: 2 CPU, 2 GB RAM minimum; 100+ devices run at <10 % CPU on a Celeron N5105 [Home Assistant Docs, 2024]
• Satel Integra + ETHM-1: 128 zones, MQTT/JSON in HA; module street price ≈ €110 [Distributor price list, 2024]
Why pick Zigbee over Matter today?
Zigbee has ten years of field-proven stability, abundant open-source stacks (Zigbee2MQTT, ZHA) and off-the-shelf routers from €8. Matter 1.2 still lacks DIY sensor support and multi-admin issues remain. You can flash ESP32-C6 with Zigbee2Tasmota now; Matter SDK for ESP32 is in beta only [Espressif, 2023].
Can I build DIY Zigbee sensors on ESP32-C6?
Yes. Flash the Z-BSP fork of ESPHome or Zigbee2Tasmota, expose clusters, then join via Zigbee2MQTT. Compile with ESP-IDF v5.1 and set channel 15 or 20 for EU [Espressif Docs, 2023].
Will one Sonoff ZBDongle-P serve two floors and ~100 nodes?
Yes if you add at least eight mains-powered Zigbee routers (e.g., Ikea TRÅDFRI repeaters) spaced every 8–10 m. The CC2652P radio handles ≈ 40 direct children; the mesh expands to 200+ via routers [Texas Instruments AN, 2023].
Is 16 GB RAM justified for Home Assistant + Zigbee2MQTT + Node-RED?
No. Real-world installs with 150 entities use <1.5 GB. Keep 4 GB for HA, 1 GB for Node-RED, and allocate the rest to Proxmox VMs [Home Assistant Docs, 2024].
PoE star cabling or low-voltage bus—what’s better?
PoE star wins. One UPS-backed PoE switch feeds all nodes, simplifies maintenance, and meets SELV safety. A 12 V trunk needs fatter copper and local DC/DC converters anyway [Elektroda, Mavannkas, post #21440918]
Which Zigbee coordinator model offers best range?
SMLIGHT SLZB-06M (EFR32-MG21 + external SMA antenna, 20 dBm) gives 2-3 dB extra link budget over Sonoff and has native USB/LAN/PoE connectivity [SLZB-06M datasheet, 2024].
How do I integrate Satel Integra alarms with Home Assistant?
Add the ETHM-1 IP module to Integra, enable TCP API, then load the built-in satel_integra integration. All zone states and outputs appear as binary_sensors and switches in HA [Home Assistant Docs, 2024].
Can Satel detectors trigger lighting scenes?
Yes. HA or Domoticz listens to zone state changes and fires automations. Example: motion zone → HA Automation → Zigbee light group ON. Latency ≈ 300 ms over LAN [Elektroda, Daro1003, post #21442111]
Deep switch boxes or central relay panel?
If the house lacks space for an extra cabinet, use 60 mm deep boxes and slim relay modules (≤ 18 mm). Keep CAT 6A slack in each box for future PoE devices [Elektroda, Mavannkas, post #21441881]
Recommended module for 230 V roller shutters?
Use Shelly 2.5 flashed with ESPHome or Zigbee-based Moes BHR-3. Both supply power factor correction and current sensing to stop the motor automatically [Shelly Datasheet, 2023].
Does Node-RED add value if I already use HA automations?
Yes when you need visual flow editing or complex conditional logic. Node-RED runs fine as an add-on, consuming ≈ 150 MB RAM idle [Node-RED Docs, 2024].
Is formal training necessary to program Satel?
Not strictly. Satel’s free manuals and YT tutorials cover 90 % of use cases. Paid courses speed up learning but add little for a single home project [Elektroda, sosarek, post #21442085]
What UPS size secures the entire smart home?
A 1500 VA/900 W line-interactive UPS keeps the PoE switch, server, and alarm panel alive for ≈ 45 minutes at 150 W draw [APC Runtime Chart, 2023].
How to avoid Zigbee interference with Wi-Fi?
Lock Zigbee on channel 25 (2.480 GHz) and set Wi-Fi APs to channels 1 or 6. Maintain 15 MHz guard band as per “Zigbee Coexistence Guide” [Silicon Labs AN, 2022].
Is Domoticz still maintained in 2025?
Yes, 2024.2 released in January adds Python 3.11 and Matter beta support [Domoticz Release Notes, 2024]. Choose it if you prefer Blockly/dzVents rule engines [Elektroda, Daro1003, post #21442914]