10-27-2026, 02:41 PM
Hello KinCony team,
I am using a KC868-A16 (original ESP32 v1.6, not A16v3) with KCS firmware v2.2.20 (build date Apr 2 2026), integrated into Home Assistant via MQTT (Mosquitto broker). Everything works: I control the outputs with {"outputN":{"value":true/false}} on KC868_A16/<serial>/SET and I read inputs and outputs from KC868_A16/<serial>/STATE.
I would like to use all the features of the board, so I have a few questions:
1. Complete MQTT documentation
Could you please send me the latest and complete MQTT protocol document for KCS v2.2.20? I need the full list of topics, commands and payload fields, including outputs, digital inputs, HT1–HT3 inputs, analog inputs (ADC), temperature/humidity sensors, RF 433 MHz, and any other parameter available via MQTT.
2. Availability / Last Will (LWT)
Does KCS v2 publish an availability or Last Will message (online/offline) when the board connects or disconnects from the broker? If yes, which topic and payload does it use? If not, is it possible to add it in a future firmware version?
3. Home Assistant MQTT Auto Discovery
Is Home Assistant MQTT auto discovery supported in KCS v2 for the KC868-A16, or only in KCS v3? If it is supported, where can I enable it?
4. Pulse command with duration
At the moment I use the "delay" output type in the web interface to create a pulse. Is there an MQTT command to send a pulse with a duration specified in the payload (for example "turn on output 5 for 300 ms"), so that the timing can be chosen per command?
5. Other commands
- Is there a command to request the full current state (refresh/query)?
- Is there a toggle command for outputs?
- Can the board publish its state periodically (heartbeat), and is the interval configurable?
- Are STATE messages published with the retain flag, and can this be configured?
6. Values for sensors not connected
I see "temperature":-100 and "humidity":-100 for sensors that are not connected. Can you confirm that -100 always means "no sensor"?
7. Firmware
Is v2.2.20 the latest KCS v2 firmware for the KC868-A16? Is a changelog available?
If you also have HTTP or TCP protocol documents for KCS v2, I would appreciate them too.
I am using a KC868-A16 (original ESP32 v1.6, not A16v3) with KCS firmware v2.2.20 (build date Apr 2 2026), integrated into Home Assistant via MQTT (Mosquitto broker). Everything works: I control the outputs with {"outputN":{"value":true/false}} on KC868_A16/<serial>/SET and I read inputs and outputs from KC868_A16/<serial>/STATE.
I would like to use all the features of the board, so I have a few questions:
1. Complete MQTT documentation
Could you please send me the latest and complete MQTT protocol document for KCS v2.2.20? I need the full list of topics, commands and payload fields, including outputs, digital inputs, HT1–HT3 inputs, analog inputs (ADC), temperature/humidity sensors, RF 433 MHz, and any other parameter available via MQTT.
2. Availability / Last Will (LWT)
Does KCS v2 publish an availability or Last Will message (online/offline) when the board connects or disconnects from the broker? If yes, which topic and payload does it use? If not, is it possible to add it in a future firmware version?
3. Home Assistant MQTT Auto Discovery
Is Home Assistant MQTT auto discovery supported in KCS v2 for the KC868-A16, or only in KCS v3? If it is supported, where can I enable it?
4. Pulse command with duration
At the moment I use the "delay" output type in the web interface to create a pulse. Is there an MQTT command to send a pulse with a duration specified in the payload (for example "turn on output 5 for 300 ms"), so that the timing can be chosen per command?
5. Other commands
- Is there a command to request the full current state (refresh/query)?
- Is there a toggle command for outputs?
- Can the board publish its state periodically (heartbeat), and is the interval configurable?
- Are STATE messages published with the retain flag, and can this be configured?
6. Values for sensors not connected
I see "temperature":-100 and "humidity":-100 for sensors that are not connected. Can you confirm that -100 always means "no sensor"?
7. Firmware
Is v2.2.20 the latest KCS v2 firmware for the KC868-A16? Is a changelog available?
If you also have HTTP or TCP protocol documents for KCS v2, I would appreciate them too.