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Reduce String memory overhead from 24 bytes to 16 bytes by limiting the maximum string length to <64Kbytes (which is larger than heap so no effective problem). Add Small String Optimization, SSO, which instead of allocating pointers to small strings on the heap will store the string in place of the pointer in the class. This should reduce memory fragmentation as Save up to 12 chars (11 + \0) in String itself by using the terminating \0 in the inline string as a flag to identify if this is a SSO or a heap string. Add a host test that verifies that no memory is allocated until a full 11 characters are assigned to a string, as well as checking all intermediate values. No user code changes should be required to work with this optimization.
Host Tests for Continuous Integration ------------------------------------- make FORCE32=0 OPTZ=-O0 CI (FORCE32=0: https://bugs.launchpad.net/ubuntu/+source/valgrind/+bug/948004) Sketch emulation on host ------------------------ This environment let compile esp8266/Arduino sketches into native environment. Network (tcp, udp, including ssl and multicast) is linked to local host interfaces. WiFi is trivialy emulated and reported as "just" already connected and usable. Currently network emulation is a complete rewrite of WiFiClient+WiFiServer/ClientContext and WifiUdp/UdpContext using socket posix API. Further work will optionally propose native lwIP library instead. How to compile and run a sketch ------------------------------- All results are stored in ./bin/ . Show the core example list: make list Build one example make D=1 ../../libraries/esp8266/examples/Blink/Blink run it: ./bin/Blink/Blink -h Optional 'V=1' enables makefile verbosity Optional 'D=1' enables core debug (same as IDE's tools menu) Optional 'OPTZ=-O2' will update gcc -O option (default is -Os, D=1 implies -O0) Optional 'FORCE32=0' will use native/default gcc (default is FORCE32=1 unless gcc-multilib is not detected) Non exhaustive list of working examples: make D=1 ../../libraries/ESP8266WiFi/examples/udp/udp make D=1 ../../libraries/ESP8266WiFi/examples/WiFiClient/WiFiClient make D=1 ../../libraries/ESP8266WebServer/examples/HelloServer/HelloServer make D=1 ../../libraries/ESP8266WebServer/examples/AdvancedWebServer/AdvancedWebServer make D=1 ../../libraries/ESP8266mDNS/examples/mDNS_Web_Server/mDNS_Web_Server make D=1 ../../libraries/ESP8266WiFi/examples/BearSSL_Validation/BearSSL_Validation Compile other sketches: - library paths are specified using ULIBDIRS variable, separated by ':' - call 'make path-to-the-sketch-file' to build (without its '.ino' extension): - CAVEAT: functions must be declared *before* being called (arduino builder is not around) make D=1 ULIBDIRS=/path/to/your/arduino/libraries/lib1:/path/to/another/place/lib2 /path/to/your/sketchdir/sketch/sketch or: ULIBDIRS=/path/to/your/arduino/libraries/lib1:/path/to/another/place/lib2 make D=1 /path/to/your/sketchdir/sketch/sketch or (preferred): export ULIBDIRS=/path/to/your/arduino/libraries/lib1:/path/to/another/place/lib2 export D=1 export OPTZ=-O2 make clean make /path/to/your/sketchdir/sketch/sketch ./bin/sketch/sketch Executable location is always in bin/. Once a sketch is compiled, just run it: bin/sketch/sketch Options are available: -h -i eth0 bind servers to this interface (WIP) -l bind Multicast to the above interface (WIP) -f no throttle (possibly 100%CPU) TODO ---- A lot. Make fun, propose PRs. - replace some "fprintf(stderr" with redirectable log functions - spiffs in a file (done, need to initialize and check) - EEPROM in a file (partly done) - SDCARD on Host filesystem ? or in an image ? - nice curses interface to display/change gpios ? - display device emulation (like ssd1306) - optionaly use arduino-builder ? - store sketch objects and binaries outside from the source directories (done for sketches) - compile and use lwIP on host - easily debug HTTP classes - https://github.com/esp8266/Arduino/issues/1715 - gpio, currently: read as 0(digital) or 512(analog). output is printed on console.