ESP8266 - How to send temperature data from one module to another via UDP?

The discussion addresses how to transmit temperature data between two ESP8266 ESP-01 modules, with one running a web server on port 80 displaying its own temperature and the goal to also show temperature from the second module on the same webpage. Initial suggestions include embedding the second module's webpage via an iframe in the first module's HTML, avoiding direct UDP communication. Challenges arise in assigning static IP addresses to the modules, especially when using a Windows 10 mobile hotspot as the network, which complicates fixed IP configuration due to subnet mismatches and lack of router access. Solutions involve correctly setting static IPs within the hotspot's subnet range (e.g., 192.168.137.x), specifying gateway, subnet mask, and DNS parameters in WiFi.config(), and ensuring the order of WiFi configuration and connection calls is correct. For inter-module communication, a recommended approach is to have the second ESP send its temperature to the first via HTTP GET requests with parameters, which the first ESP stores and displays alongside its own data. The first ESP's web server then serves a combined page with both temperature readings. Code examples illustrate HTTP GET request formatting, proper URL parameter passing, and HTML iframe embedding. The discussion also highlights common pitfalls such as incorrect IP subnet settings, improper HTTP request formatting (e.g., misuse of Content-Length), and network conflicts when static IPs are assigned without router control. Ultimately, the solution favors HTTP GET communication between ESP modules over UDP for simplicity and reliability in this context.
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