Recently, I have been using Daxia’s Bluetooth modules, which come in two models: BT36 and BT04-E. There are significant differences between these two models in terms of communication.First, let’s talk about the upload (data sent from the Bluetooth module to the host computer) byte count. The BT04-E sends 12 bytes of data each time. For example, when the BT04-E sends 72 bytes to the host computer, the host must receive it in 6 separate transmissions.
On the other hand, the BT36 does not seem to have this issue. I have tested sending 32 bytes to the host computer, and it was received in one go.Next, regarding the download (data sent from the host computer to the module) byte count, the BT04-E can only receive 20 bytes of data at a time; if it exceeds this, it will not receive anything. I tested sending 72 bytes to the module, and the result was that the module only received 20 bytes.
I have not tested the BT36, so I do not know if it will encounter this problem. I have only tested sending 20 bytes at a time, and there were no issues. This might be a limitation of Bluetooth communication!Bluetooth modules must adhere to Bluetooth communication protocols, so when we need to use a specific module, we must be familiar with its communication specifications to effectively handle large data communication tasks.2025.7.16
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