nodemcu-firmware/extcomp-template/mymod.c

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#include "module.h"
static int lmymod_hello(lua_State *L)
{
if (lua_isnoneornil(L, 1))
lua_pushliteral(L, "world");
lua_getglobal(L, "print");
lua_pushliteral(L, "Hello,");
lua_pushvalue(L, 1);
lua_call(L, 2, 0);
return 0;
}
LROT_BEGIN(mymod, NULL, 0)
LROT_FUNCENTRY(hello, lmymod_hello)
LROT_END(mymod, NULL, 0)
NODEMCU_MODULE(MYMOD, "mymod", mymod, NULL);