Wireless technologies are now operating in the same frequency bands, such as Wi-Fi, Bluetooth, ZigBee, and LoRa all using the 2.4 GHz band. This has made coexistence a reality, and there are three types of coexistence among these different wireless technologies. The first type treats other signals in the same band as interference, and schemes such as forward error correction (FEC), retransmission, interference avoidance, and signal recovery have been developed to address this. The second type makes one signal recognizable to the other signal, improving their ability to coexist. The third type, known as cross-technology communication (CTC), enables direct communication between two different technologies. CTC opens a door for direct communication between different wireless technologies. In this talk, we will present the latest progress in CTC.