It is based on JSON data stream. Our eRetail 3.0 electronic shelf label system (eRetail 3.0) can be simply divided into three parts: DataSync / API、eRetail 3.0 and hardware devices. Among them, API is Restful style web API, which is responsible for providing interface for customer system to actively push commodity data; Data sync is a background service that actively grabs data from the customer system (such as database, WebAPI, Excel, etc.); SDK is responsible for managing commodity data, hardware equipment information, scheduling price change tasks etc. The hardware includes wireless communication base station, tag and related network equipment.Due to the actual project situation, it does not fully comply with the REST API specification. Here are some technical documents for you , please click the linkhttps://www.eslmfg.com/comm02/Specification.htm