在Flutter 动中绘制ECG图

简短版本:你must知道设备如何编码数据，以便正确地解释你接收的数据，假设那是数据而不是某些接口特殊命令.否则，您可以猜测并try 从字节转换为数据.

Long version: that piece of data you pasted (I assume it's not the complete) looks like some byte or hex value, but without having a precise idea of what that means, you won't go anywhere. Those bytes may be the bytes of an image you need to reconstruct, or maybe of a PDF file, or numeric values of a curve, or almost anything else. They may even be some special commands the instrument uses to communicate (something like telling "the measure has started").
I just have faced a similar problem: a medical device was sending me a string that could be long up to 70000 or more characters. I had to contact the manufacturer to have a description of their outgoing protocol, because the string itself had no meaning: I suspected it was a base64-encoded string because sometimes there were some '=' at the end, but I could not be sure. In the end, the string, after being decoded was to be interpreted as a set of bytes representing a PNG image, but I could be sure of this only by looking at the instrument documentation. Otherwise, you just have to try different interpretations and hope to get it right.
Just to give you an idea, once I had to work on a similar instrument: that time the string was not meant as a PNG image converted to bytes, but it was a chart. Each pair of bytes represented the value of the Nth value in the X axis: I just had to build a bar chart, with the bar at the N/2 position being as high as the value of Nth pair of bytes. Another example would be an instrument that measured Covid-19 antigenes reaction over a 15-minutes time: that instrument enveloped the real data in headers, while sending other information encoded with special characters. Using your data string as example, it was sending this kind of messages:

• C8—44—80是每个报文的报头
• C8—44—80—01后面是另一个字节，代表测量开始、停止或暂停等特殊命令
• C8—44—80—0A代表真实数据，后面是10字节数据

我希望这能给你一个概念，让你知道你有多少可能错误地解释你正在接收的数据.你最好还是带上一些制造商的文件.