Adam4, my first thought would be that this must be related to the ST app trouble you’re having. Thermostat Manager has no restrictions whatsoever in regards to thermostat type. If your device has, “thermostat” capability, then you should be able to select it no problem.
Unfortunately Thermostat Manager was not really designed for this purpose (Keep Me Cozy was). While TM does have the ability to control Emergency Heat mode based on an external sensor, that is the only type of external sensor that is supported at this time. This was added in by request in order to support those who live in extremely cold climates. Thermostat Mode Director attempts the feature that you are looking for (although it doesn’t work, for the same reason that I have not implemented it in Thermostat Manager, as I will explain). The thing is, unless you have a Nest or an Ecobee, I can make an app that will allow you to link an external sensor to your thermostat. In other words, we can say, for example, when tempSensorX hits temperature 80F, activate cool mode on the thermostat – and this will work. Let’s say that it is 75F degrees in the thermostat room and 80F in tempSensorX’s room. The problem is that the thermostat doesn’t actually start blowing cold air until its own internal thermometer hits the temperature setpoints that were set on the thermostat itself. Assuming that our thermostat setpoint is also 80F, in this situation, our thermostat will be set into cooling mode – it just won’t blow cold air. In other words, the system doesn’t really work like an Ecobee system in which the thermostat gives up control to the external sensor. This is why we don’t support it; it doesn’t work. Now, as long as you understand that I can bring the horse to water but I can’t make him drink (blow cold air), Thermostat Manager could be made to activate thermostat modes based on an external temp sensor. And I do get occasional requests from people who understand this and still want to add in support for this feature anyway. But as far as I’m concerned it is a feature that will never work well and so is very low on my priority list. I do expect I will add it in eventually but I won’t be adding in some half-baked AI (like Keep Me Cozy) in order to control it. Thermostat Manager is primarily a presence based thermostat mode manager.
My suggestion would be, check out Thermostat Manager anyway. It is pretty refined and I’m sure you noticed the developer is quite active. If you’re looking for something that is Thermostat Mode Director like, we’re probably the best of that type. But if you’re looking for, “Keep Me Cozy”, that is not what Thermostat Manager is designed for.