Some integrated Wifi Routers/Modems such as TD-W8901N offer TR-069 (CWMP), is it possible to manage parameters such ass SSIDs, DHCP, WAN mode using this feature? Is this protocol designed to work on devices installed behind ISP modems as well?
What sort of parameters can be set using TR-069 (CWMP)?
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It depends on a number of factors - not least the data model objects supported by the client. Typical data models are TR-098 (typically not used for new implementations) and TR-181 (generic device data model, so covers gateways and endpoints) for gateways, TR-104 for VoIP endpoints etc.
It gets more complicated, because a device likely will not support all the objects in a data model. Usually The ACS starts by reading the supported object from the device (their are other methods, but not well supported).
TR-069 is designed to work behind modems/routers, as its the device which connects to the ACS. As such most devices are hard-coded to communicate with their owners (usually the ISP). TR-069 for end user control of devices can generally be considered to be overkill - its complicated. As an operator, if you want to control 100k+ devices, then its definitely a good way to go