td HTML tag, or for better specification we can search for information in more detail based on class, identifiers and other attributes that HTML elements can acquire. If we load dynamic data from a web page, we can assume where it will be located in the structure of the loaded HTML source code of the website, for example between a paired td. Part of the analysis is also to find guidelines that can simplify the whole process of web scraping. The first step in implementing a web scraper on such an embeeded platform must be to analyze the specific website from which we want to obtain data. The data was contained only in the RAM memory of the microcontrollers for buffering purposes. The data was handled ethically without publishing the retrieved content on other websites. The information obtained was not saved, it was obtained only once in order to demonstrate the function of a webscraper in an article using a web socket as when using a web page by any human browser. Web scraper is exclusively educational for this article. For this reason, today I decided to extend this topic for a full-fledged client-side webscraper on the Arduino platform with Ethernet shield and WiFi platforms ESP8266, ESP32. However, a full-fledged web scraper should run on one device and should not be dependent on other systems, which complicates its management and controllability. The web server that received the line of the website was able to extract its content on the basis of a regular expression and, in the case of an e-mail address or telephone number, store this data in a MySQL database and dynamically expand the existing database of such data. Websocket loaded the web page line by line of the source code and sent it to another web server via HTTPClient. The implementation used a websocket for one connection and an HTTPClient for the other. That particular implementation of the web scraper used ESP in client mode, using two independent connections to two web servers. At that time, she was solving the problem of how to create a simple web scraper on the ESP8266 / ESP32 platform. The topic of web scraper appeared on this blog in 2018.
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