A method (30) performed in a client device (16) is provided for managing constrained devices (14a, 14b, 14c), which to at least some extent fail to support a Lightweight Machine to Machine, LWM2M, protocol. The client device (16) is compatible with a LWM2Mprotocol for communicating with a LWM2M server (17) and comprises a LWM2Mcontroller object (22) for management of any discovered constrained device (14a, 14b, 14c). The method (30) comprises discovering (31) one or more constrained devices (14a, 14b, 14c); creating (32), for each discovered constrained device (14a, 4b, 14c), a respective LWM2M connected device object (23), wherein the LWM2M controller object (22) points at the one or more created LWM2Mconnected device 10 objects (23); and exposing (33) the LWM2M controller object (22) to the LWM2M server (17). A method (40) in a server device (17), client device (16), server device (17), computer programs and computer program products are also provided.