The first of these parameters is the client id which is a string based identification for the client which must be unique to each MQTT client connecting to the broker.
第一个参数是客户机id，它是基于字符串的客户机的标识，必须对每一个连接到代理的MQTT客户机唯一。
2
A new lithology identification method based on axial amplitude modulation signal of drill string is proposed.