A: it is recommended that you purchase at least 2pcs or more for the first time to facilitate testing. After purchasing the module, 

our salesmen will provide you with a set of information packages, including manuals, upper computers, packaging libraries and 

other information.
After receiving the module, it is strongly recommended that you first use USB to TTL to connect with the module, and use the 

computer and the upper computer provided by the data package to conduct communication test and familiarize yourself with 

the protocol. After the test meets the requirements, the product can communicate with MCU.