ArtiFX on ESP8266

[lost-hope]

Feature Request:
Add ArtiFX support for ESP8266 platform

Additional Info:
When adding the ArtiFX usermod to the env of the ESP8266, the main issue seems to be that the function esp_get_free_heap_size() is not present for ESP8266 (https://github.com/espressif/ESP8266_RTOS_SDK/blob/35375c17be0b7837239c330d9a411a0ad46196b8/components/esp8266/source/system_api.c#L378)
That function itself needs the heap_caps_get_free_size function (https://github.com/espressif/ESP8266_RTOS_SDK/blob/35375c17be0b7837239c330d9a411a0ad46196b8/components/heap/src/esp_heap_caps.c#L69)
That function uses two global variables, that need to be properly initialized: g_heap_region_num and g_heap_region most of it seems to be initialized here (https://github.com/espressif/ESP8266_RTOS_SDK/blob/35375c17be0b7837239c330d9a411a0ad46196b8/components/heap/port/esp8266/esp_heap_init.c#L21)

[softhack007]

ESP.getFreeHeap() should also exists on 8266. It delivers the same information as esp_get_free_heap_size(), but it's part of the standard framework.

[MoonModules]

ESP.getFreeHeap worked! And some other changes and I am able to compile it, but then the result of ESP.getFreeHeap is

setup 8552 bytes free
open /wledv033.json 8128 ✓
definitionTree 0 => 8088 ✓
deserializeJson() of definition failed with code NoMemory
Setup not successful

Around 8K free while on ESP32 around 100K free, and that is what ARTI-FX needs (maybe like 50k works...)

Is it possible to allocate more heap?

[lost-hope]

yep seems to work:
I added a small ifdef at beginning of arti_wled.h:

#ifdef ESP32
#define FREE_SIZE esp_get_free_heap_size() // ESP32 is set in wled context: small trick to set WLED context
#define ARTI_PLATFORM ARTI_ARDUINO         // else on Windows/Linux/Mac...
#endif

#ifdef ESP8266
#define ARTI_PLATFORM ARTI_ARDUINO // else on Windows/Linux/Mac...
#define FREE_SIZE ESP.getFreeHeap()
#endif

and encased the `#define FREE_SIZE esp_get_free_heap_size()``in arti.h in a ifndef, so it does not override the other setting.

i am getting an error for no convertFromJson function in ArduinoJson-v6. how did you manage to circumvent that?

[MoonModules]

I did something similar (used ARDUINO_ARCH_ESP32/ESP8266 instead of ESP32/ESP8266), plus had to change the way strings are send to Serial/File. Will commit in half an hour I guess...

[MoonModules]

Committed! https://discord.com/channels/700041398778331156/1060959116526362634/1093848593489739879

Please test both on esp8266 (likely crash due to low mem but maybe you can increase mem alloc some way) and on esp32 (using USER_PRINTF now, so ARTI-FX can also be tracked in Net Print)

[MoonModules]

This asChar stuff is also something to look at, this caused me grey hairs last year when I made Arti, Serial.print looks so vulnerable for crashes, I got it now stable for ESP32 using .asstd::string().c_str(), which uses the string type as 'bridge' but if I use the direct way: .as<const char *>() then it crashes on ESP32. For ESP8266 I now have turn it off completely (#define asChar(x) "", .asstd::string().c_str() caused compile errors) so all ERROR_ARTI and DEBUG_ARTI will print nothing for asChar parts (to be on the save side) but would be nice if print