Recently I was exploring the differences between IBUS and SBUS protocols used in remote controls. The IBUS protocol appears to be a very simple half-duplex UART operating on speed 115200 baud. Packets of a fixed size, simple checksum calculation... Wait a second. What if we take the dirt-cheap ESP01 module, program it as the receiver and operate it with the smartphone? In just half an hour the minimal prototype was built.