sensors Article Fast Synchronization Scheme Using 2-Way Parallel Rendezvous in IEEE 802.15.4 TSCH † Byeong-Hwan Bae and Sang-Hwa Chung * Department of Electrical, Electronics, and Computer Engineering, Pusan National University, Busan 46241, Korea; bbh2002@pusan.ac.kr * Correspondence: shchung...