If you surf on Chinese shopping web sites you might have seen devices from Broadlink like the A1. They are quite cheap and seem to be powerful. However, have a second look before buying.
First of all, some sellers claim that the A1 has a PM2.5 particle sensor “coming soon”. Looks like this isn’t implemented yet in this software – right? Wrong! The device doesn’t have the necessary hardware included. There might be an add-on module coming in the future, but it will be a hardware-add-on, not just a software upgrade.
Another thing that Broadlink doesn’t publicly communicate is the fact that there are no open interfaces available. It seems that there is an SDK for the device, but Broadlink only allows to use it under NDA and it is only available as library for IOS and Android. That makes it hard to impossible to use this hardware as a part of a larger integration.
Therefore I can’t recommend any of the Broadlink products as long as Broadlink doesn’t offer any documented APIs.