Bluetooth SIG Mesh is a set of Mesh protocols established by the Bluetooth Special Interest Group (SIG) based on Bluetooth technology. Currently, most Bluetooth Mesh systems in smart homes are implementations of SIG Mesh that adopt a “flooding” mechanism. The flooding mechanism lies between star topology and true Mesh: it is like a semi-solid battery in lithium batteries, neither fully solid nor liquid, but rather “semi Mesh.” For smart homes, it is sufficient: its efficiency is comparable to that of star networks, with a single central node achieving whole-house coverage through broadcast flooding. The stability is reliable, but the efficiency is relatively low, and it can only complete one unidirectional connection at a time before initiating the next. True Mesh should be multipath, bidirectional, capable of concurrent connections, and adaptive routing. If multiple points flood simultaneously, it is prone to packet loss, posing a higher risk. In lightweight scenarios with fewer devices or sensors, the flooding SIG Mesh protocol is adequate; its design and algorithms are simple, and while it is less efficient, it represents the entry-level form of Bluetooth Mesh.