Java PC-side client for a generic wire protocol (image transfer, drawing, storage, GPIO, OTA, power management) to remote-control small e-paper/LCD HMI displays over WiFi/TCP, BLE, and Serial - not tied to any one device. Originally developed against the CrowPanel 4.2" e-paper display; see doc/PROTOCOL.md in the firmware-BSHMIEinkDevice repository for the full wire protocol specification this implements.