Add openwrt makefile

Makefile

@@ -1,4 +1,4 @@
-VERSION = 0.0.7
+VERSION = 0.0.11
 # Global target; when 'make' is run without arguments, this is what it should do
 all: bell-mqtt-recv
  
@@ -35,4 +35,4 @@ clean:
 	rm bell-mqtt-recv -f *.o
 
 pack:
-	tar cvzf ../bell-rspro-$(VERSION).tar.gz $(DEPS) $(SRC) Makefile bell-rspro.init
+	tar cvzf ../bell-rspro-$(VERSION).tar.gz $(DEPS) $(SRC) Makefile Makefile.openwrt bell-rspro.init

Makefile.openwrt

@@ -0,0 +1,54 @@
+include $(TOPDIR)/rules.mk
+
+# Name, version and release number
+# The name and version of your package are used to define the variable to point to the build directory of your package: $(PKG_BUILD_DIR)
+PKG_NAME:=bell-rspro
+PKG_VERSION:=0.0.10
+PKG_RELEASE:=1
+
+# Source settings (i.e. where to find the source codes)
+# This is a custom variable, used below
+SOURCE_DIR:=/home/jaro/bell-rspro
+
+include $(INCLUDE_DIR)/package.mk
+
+# Package definition; instructs on how and where our package will appear in the overall configuration menu ('make menuconfig')
+define Package/bell-rspro
+  SECTION:=net
+  CATEGORY:=Network
+  PKG_BUILD_DEPENDS:=mosquitto
+  TITLE:=bell-rspro
+  DEPENDS:=+libmosquitto-nossl
+endef
+
+# Package description; a more verbose description on what our package does
+define Package/bell-rspro/description
+   App for home automation with MQTT for RS PRO and sending signal to GPIO port
+endef
+
+# Package preparation instructions; create the build directory and copy the source code. 
+# The last command is necessary to ensure our preparation instructions remain compatible with the patching system.
+define Build/Prepare
+	mkdir -p $(PKG_BUILD_DIR)
+	cp $(SOURCE_DIR)/* $(PKG_BUILD_DIR)
+	$(Build/Patch)
+endef
+# Package build instructions; invoke the target-specific compiler to first compile the source file, and then to link the file into the final executable
+define Build/Compile
+	$(MAKE) -C $(PKG_BUILD_DIR) \
+	  CC="$(TARGET_CC)" \
+	  LD="$(TARGET_LD)" \
+	  CFLAGS="$(TARGET_CFLAGS)" \
+	  LDFLAGS="$(TARGET_LDFLAGS) -lmosquitto" \
+	  CROSS_COMPILE="$(REAL_GNU_TARGET_NAME)-"
+endef
+
+# Package install instructions; create a directory inside the package to hold our executable, and then copy the executable we built previously into the folder
+define Package/bell-rspro/install
+	$(INSTALL_DIR) $(1)/usr/sbin
+	$(INSTALL_DIR) $(1)/etc/init.d
+	$(INSTALL_BIN) $(PKG_BUILD_DIR)/bell-mqtt-recv	$(1)/usr/sbin
+	$(INSTALL_BIN) $(PKG_BUILD_DIR)/bell-rspro.init	$(1)/etc/init.d/bell-rspro
+endef
+
+$(eval $(call BuildPackage,bell-rspro))

gpiosysfs.c

@@ -32,19 +32,17 @@ static void writeToFile(const char *absoluteFileName, const char *contents) {
 }
 
 void gpioSetup(const char *pin) {
-	// TODO only export if not already exported...
-	if (access("/sys/class/gpio/unexport",W_OK) == 0) 
-		writeToFile("/sys/class/gpio/unexport", pin);
-	writeToFile("/sys/class/gpio/export", pin);
-
-	char buf[33];
+	char buf[64];
 	struct stat statBuf;
 	int pinExported = -1;
 
 	sprintf(buf, "/sys/class/gpio/gpio%s/direction", pin);
 
+	if (stat(buf, &statBuf) != 0)
+		writeToFile("/sys/class/gpio/export", pin);
+
 	// May have to briefly wait for OS to make symlink! 
-	while (pinExported != 0) {	
+	while (pinExported != 0) {
 		msleep(1000);
 		pinExported = stat(buf, &statBuf);
 	}