Keep-alive

Keep-alive decoding

Periodically sent message which contains the most important device data.

The data is described in the table below, where an example is also given in a second table.

Byte	Bit Index	Value	Meaning
0	-	01	Command byte for this packet.
1	7	X	Set to 1 when the temperature is negative.
1	6:0	XX	Internal temperature sensor data – T[°C].
2	-	XX	Relay state: 0x00 - OFF; 0x01 - ON.

Keepalive example

Byte	Bit index	Value	Meaning
0	-	01	Command byte for this packet.
1	7	0	0: The temperature is positive.
1	6:0	1C	Internal temperature sensor: 0x1C = 28°C.
2	-	01	Relay state: 0x01 - ON.

Keepalive period

SET

Byte index	Hex value - Meaning
0	02 – Command code to set keepalive period
1	XX – keep-alive period in minutes. Value 0x00 isn’t applicable. Default value 0A = 10min.

Example command: 0x020F

The example sets the keep-alive period to 15 minutes.

GET

This command is used to get the period of the keep-alive command messages. Server sends the command code and the response is sent from the device together with the next keep-alive command.

The keep-alive in the example is omitted for clarity.

Byte index	Sent request	Received response
0	12 – The command code.	12 – The command code.
1		XX – device keep-alive period in minutes.

Example command sent from server: 0x12;

Example command response: 0x120F – the keep-alive is 15 minutes.