Open Supervised Device Protocol (OSDP)
Open Supervised Device Protocol (OSDP) is an IEC standard (IEC 60839-11-5) intended to improve interoperability among access control and security products. It supports Secure Channel (SC) for encrypted and authenticated communication between configured devices.
OSDP describes the communication protocol for interfacing one or more Peripheral Devices (PD) to a Control Panel (CP) over a two-wire RS-485 multi-drop serial communication channel. Nevertheless, this protocol can be used to transfer secure data over any stream based physical channel. Read more about OSDP here..
Although OSDP is steered towards the Access and Security industries, it can be used as a general communication protocol for devices in a secure way without too much resource requirements. The security is not top-notch (AES-128) but it is reasonable enough, given that the alternative is no security at all.
OSDP Supports the control of the following components on a PD:
LED
Buzzer
Keypad
Output (GPIOs)
Input Control (GPIOs)
Displays
Device status (tamper, power, etc.,)
Card Reader
Fingerprint Reader