This paper proposes a Duty-Cycle (DC) control method in order to improve the Packet Delivery Ratio (PDR) for IEEE 802. 15. 4-compliant heterogeneous Wireless Sensor Networks (WSNs). https://www.roneverhart.com/1992-1994-TOYOTA-CAMRY-Front-Bumper-Cover-Paint-Code-923-Silver-Taupe-Metallic/