Abstract: A method in a wireless sensing device for authenticating a gateway device of a sensor network is described. The method includes receiving a certificate where the certificate was generated by the management server upon a determination that the gateway device and the wireless sensing device are associated and is a digital document including data and a digital signature, where the digital signature was generated by the management server based on the data and a private key of the management server, and where the data includes a first identifier and a second identifier; confirming that the wireless sensing device is authorized to upload data to the gateway device; in response to the confirming that the wireless sensing device is authorized to upload data to the gateway device, uploading to the gateway device data indicative of a plurality of sensor measurements taken over time to be transmitted to the management server.