Fix a handlers.c error I missed because of missing include file dependencies.

Also revert a Makefile change (lwip library) accidentally committed.
Add a "make depend" target to avoid missing dependencies.

Makefile

@@ -253,7 +253,7 @@ MODULES		+= $(foreach sdir,$(LIBRARIES_DIR),$(wildcard $(sdir)/*))
 EXTRA_INCDIR 	= include .
 
 # libraries used in this project, mainly provided by the SDK
-LIBS = c gcc hal phy pp net80211 wpa main lwip crypto
+LIBS = c gcc hal phy pp net80211 wpa main lwip_536 crypto
 
 # compiler flags using during compilation of source files
 CFLAGS	+= -Os -ggdb -std=c99 -Werror -Wpointer-arith -Wundef -Wall -Wl,-EL -fno-inline-functions \
@@ -519,3 +519,13 @@ ifeq ("$(COMPRESS_W_HTMLCOMPRESSOR)","yes")
 endif
 
 $(foreach bdir,$(BUILD_DIR),$(eval $(call compile-objects,$(bdir))))
+
+depend:
+	makedepend -p${BUILD_BASE}/ -Y -- $(INCDIR) $(MODULE_INCDIR) $(EXTRA_INCDIR) $(SDK_INCDIR) -I${XTENSA_TOOLS_ROOT}../xtensa-lx106-elf/include -I${XTENSA_TOOLS_ROOT}../lib/gcc/xtensa-lx106-elf/4.8.2/include -- */*.c
+
+# Rebuild version at least at every Makefile change
+
+${BUILD_BASE}/esp-link/main.o: Makefile
+
+# DO NOT DELETE
+

cmd/handlers.c

@@ -40,6 +40,8 @@ static void cmdWifiGetApCount(CmdPacket *cmd);
 static void cmdWifiGetApName(CmdPacket *cmd);
 static void cmdWifiSelectSSID(CmdPacket *cmd);
 static void cmdWifiSignalStrength(CmdPacket *cmd);
+static void cmdWifiQuerySSID(CmdPacket *cmd);
+static void cmdWifiStartScan(CmdPacket *cmd);
 
 void cmdMqttGetClientId(CmdPacket *cmd);
 
@@ -361,7 +363,7 @@ static void ICACHE_FLASH_ATTR cmdWifiSignalStrength(CmdPacket *cmd) {
 }
 
 // 
-void ICACHE_FLASH_ATTR cmdWifiQuerySSID(CmdPacket *cmd) {
+static void ICACHE_FLASH_ATTR cmdWifiQuerySSID(CmdPacket *cmd) {
   CmdRequest req;
   cmdRequest(&req, cmd);
   uint32_t callback = req.cmd->value;
@@ -381,7 +383,7 @@ void ICACHE_FLASH_ATTR cmdWifiQuerySSID(CmdPacket *cmd) {
 }
 
 // Start scanning, API interface
-void ICACHE_FLASH_ATTR cmdWifiStartScan(CmdPacket *cmd) {
+static void ICACHE_FLASH_ATTR cmdWifiStartScan(CmdPacket *cmd) {
   // call a function that belongs in esp-link/cgiwifi.c due to variable access
   wifiStartScan();
 }