There are provided systems and methods for a smart harbor device for intelligent updating and selection for use of transaction processing terminal devices. A smart harbor device may be used to provide updating, servicing, and other maintenance of transaction processing terminal devices, such as EMV terminals used in retail transaction processing. The smart harbor device may include a port where the transaction processing terminal devices may be places, and the smart harbor device may connect to each of the transaction processing terminal devices. Once connected, the smart harbor device may run diagnostics to determine the statuses and conditions for each of the transaction processing terminal devices and maintenance the transaction processing terminal devices. The maintenance may be performed at times where the transaction processing terminal devices are not required for use. Additionally, the smart harbor device may intelligently select one based on statuses and device capabilities.