中文: 如果你正在使用HM-10藍芽模組，卻發現AT指令很奇怪，你買到的可能是山寨品，會需要使用截然不同AT指令
English: If you have problem using HM-10 module with AT commands, you may encounter clone/knockoff product. It takes different AT commands.
中文:
我不知如何在硬體上區別山寨品，但如果你發現你的AT指令需要包含「\r\n」，那你很可能是在使用山寨品，多數正品使用的AT指令會無法運作
你必須到莆洋國際(http://www.pu-yang.com.tw/download.html)的網站，下載編號1049和1513的說明檔案，來查看山寨品使用的AT指令
另外我買到的山寨品，有以下的使用現象
1.產品名: HM-10 CC2541 主從一體 => 明顯韌體有問題，當從機跟手機連線可以，和其他藍芽模組連線有各種問題，不管是當主機或從機
2.產品名: HM-10 CC2541 從機模組 => 其實可以當主機也可以當從機，除了需要使用上述山寨品專用的AT指令，運作很好
結論:
除非你知道如何買到正版HM-10，否則推薦嘗試用其他模組開發藍芽，真的要買山寨(莆洋國際)要選HM-10 CC2541 從機模組，他的特徵是硬體上比主從一體多一個小按鈕
English:
I don't know how to distinguish knockoff products by hardware, but if you find that your AT commands need to include "\r\n," you are likely using a knockoff product. Most AT commands of the genuine product will not function as expected.
You must visit the Pu-Yang company website (http://www.pu-yang.com.tw/download.html) and download the documentation with the index 1049 and 1513 to check the AT commands used by knockoff products. (Warning: it's all chinese)
Additionally, the knockoff products I purchased exhibit the following behaviors:
Product Name:
HM-10 CC2541 Master-Slave Integrated => Clearly, there is an issue with the firmware. While it can connect by a smartphone as a slave , various problems arise when connecting to other Bluetooth modules, whether acting as a master or slave.
Product Name:
HM-10 CC2541 Slave Module => It can actually function as both a master and a slave. Apart from requiring the custom AT commands mentioned above for knockoff products, it operates well.
Conclusion:
Unless you know how to purchase genuine HM-10, it is recommended to try developing Bluetooth with other modules. If you must buy a knockoff (from Pu-Yang company), choose the HM-10 CC2541 Slave Module. To distinguishing, there is an extra small button on the hardware of HM-10 CC2541 Slave Module compared to the master-slave integrated module.
