Is it possible to control Homematic IP devices without Homematic IP Access Point via Amazon Echo devices with integrated smart home hub?
The integration of Homematic IP with Amazon Alexa takes place directly via the Homematic IP cloud, that is, in principle, via the Homematic IP Access Point.
The Amazon Alexa device variant Echo Plus supports a variant of the ZigBee protocol, which directly supports Philips HUE lights. With other Amazon Alexa devices, also an additional gateway is required for Philips HUE.
Thus, the cheapest way to set up voice control with Amazon Alexa is an Amazon Echo Dot + Homematic IP Access Point.