Internet-of-Things (IoT) connectivity modules and associated systems and methods for pool and spa equipment are provided. The IoT connectivity module includes an input/output module configured for communication with a pool or spa device, a radio module having a first wireless transceiver configured for wireless communication with a user wireless device and a second wireless transceiver configured for wireless communication with a gateway device, and a processor in communication with and controlling the input/output module and the radio module. The radio module is configured to receive a control command formatted in a first format using at least one of the first wireless transceiver or the second wireless transceiver. The processor is configured to process the control command into a second format compatible with the pool or spa device, and the input/output module is configured to transmit the control command in the second format to the pool or spa device, the pool or spa device executing the control command to control operation of the pool or spa device. The input/output module is also configured to receive a status message from the pool or spa device formatted in a third format, the processor is configured to process the status message into a fourth format, and the radio module is configured to transmit the status message to the user device in the fourth format using at least one of the first wireless transceiver or the second wireless transceiver.