A network exposure function receives from an application function, a first message requesting delivery of one or more packets to a wireless device. The network exposure function determines that the one or more packets are for an Internet of things (IoT) data transmission that requires a session management function (SMF) that supports the IoT data transmission. The network exposure function sends to a network repository function based on the determining, a second message requesting a discovery of the session management function, the second message comprising a parameter indicating the IoT data transmission. The network exposure function receives from the network repository function based on the parameter, a third message comprising an identifier of the session management function that supports the IoT data transmission. The network exposure function sends to the session management function, a fourth message requesting delivery of the one or more packets to the wireless device.