Stelpro stzw402+ setpoint issue

[david81]

Hello,

I believe I've run across an issue that has to do with behind the scenes temperature unit conversions. I have recently installed a Stelpro STZW402+ thermostat and included it in my network without issue. Unfortunately, I have been unable to set the setpoint on the device when it is set to F units. Setting both Domoticz and the thermostat to C enables me to set the setpoint without issue. Setting Domoticz to C and leaving the thermostat on F also works, but only for certain temps. Digging through the debug logs, this seems to be related to the length of the value being sent to the thermostat by Domoticz and, in turn, OZW.

An unsuccessful attempt (setting F value) looks like this in the logs (here I set 68 F in the UI)

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2018-01-28 11:35:38.205 Info, Node044, Value::Set - COMMAND_CLASS_THERMOSTAT_SETPOINT - Heating 1 - 1 - 1 - 68.002884
2018-01-28 11:35:38.205 Detail, Node044, Queuing (Send) ThermostatSetpointCmd_Set (Node=44): 0x01, 0x0f, 0x00, 0x13, 0x2c, 0x08, 0x43, 0x01, 0x01, 0xcc, 0x04, 0x0d, 0xa4, 0x44, 0x25, 0x94, 0x10

A successful attempt (setting F value) looks like this (here I set 16.1 C in the UI)

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2018-01-26 21:38:52.373 Info, Node042, Value::Set - COMMAND_CLASS_THERMOSTAT_SETPOINT - Heating 1 - 1 - 1 - 60.98
2018-01-26 21:38:52.374 Detail, Node042, Queuing (Send) ThermostatSetpointCmd_Set (Node=42): 0x01, 0x0d, 0x00, 0x13, 0x2a, 0x06, 0x43, 0x01, 0x01, 0x4a, 0x17, 0xd2, 0x25, 0x7c, 0x58

A successful attempt (setting a C value) looks like this (here I set 18 C in the UI)

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2018-01-26 21:40:40.366 Info, Node042, Value::Set - COMMAND_CLASS_THERMOSTAT_SETPOINT - Heating 1 - 1 - 1 - 18
2018-01-26 21:40:40.366 Detail, Node042, Queuing (Send) ThermostatSetpointCmd_Set (Node=42): 0x01, 0x0c, 0x00, 0x13, 0x2a, 0x05, 0x43, 0x01, 0x01, 0x01, 0x12, 0x25, 0xd3, 0x69

I have attempted to update the ozq config file for the device by adding

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override_precision="2"

to the device xml (excluded the device, stopped Domoticz, altered XML, started Domoticz, included device) but this does not resolve the issue.

Is Domoticz doing some sort of conversion on the back end that causes 68 F in the UI to turn into 68.002884 by the time it gets to OZW?

I've posted this issue on the OZW group, but have not heard anything for a few days, so I'm hoping someone over here may have some insight.

[david81]

Anyone have any thoughts on this one? I'd really love to get this thermostat linked up with the rest of the system.