How to enable debug logging for Arduino's ESP8266HTTPClient with PlatformIO
Part of the Getting Started with ESP8266 + Arduino series.
While working on my ESP8266 Arduino HTTPS demo project, I wanted to enable debug logging from the HTTP client. It took me a few minutes to figure out, likely due to my lack of experience with this platform & toolchain (Arduino, ESP8266, PlatformIO).
In platfomio.ini, add:
build_flags =
-DDEBUG_ESP_HTTP_CLIENT -DDEBUG_ESP_PORT=Serial
The first flag enables debugging for the HTTP client; the second tells it where the debug logging should go.
(I initially tried adding #define DEBUG_ESP_HTTP_CLIENT and #define DEBUG_ESP_PORT Serial in my program, before including ESP8266HTTPClient.h. That does not work, though a similar approach works to configure some third-party libraries. I believe this is because the Arduino core and therefore the HTTP client are built well before the compiler gets to my main.cpp file and its #defines, so these definitions must be set earlier.)
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