reduce memory consumption

Makefile

@@ -114,14 +114,14 @@ LIBS		= c gcc hal phy pp net80211 wpa main lwip
 
 # compiler flags using during compilation of source files
 CFLAGS		= -Os -ggdb -std=c99 -Werror -Wpointer-arith -Wundef -Wall -Wl,-EL -fno-inline-functions \
-		-nostdlib -mlongcalls -mtext-section-literals  -D__ets__ -DICACHE_FLASH -D_STDINT_H \
-		-Wno-address -DFIRMWARE_SIZE=$(ESP_FLASH_MAX) \
+		-nostdlib -mlongcalls -mtext-section-literals -ffunction-sections -fdata-sections \
+		-D__ets__ -DICACHE_FLASH -D_STDINT_H -Wno-address -DFIRMWARE_SIZE=$(ESP_FLASH_MAX) \
 		-DMCU_RESET_PIN=$(MCU_RESET_PIN) -DMCU_ISP_PIN=$(MCU_ISP_PIN) \
 		-DLED_CONN_PIN=$(LED_CONN_PIN) -DLED_SERIAL_PIN=$(LED_SERIAL_PIN) \
 		"-DVERSION=$(VERSION)"
 
 # linker flags used to generate the main object file
-LDFLAGS		= -nostdlib -Wl,--no-check-sections -u call_user_start -Wl,-static
+LDFLAGS		= -nostdlib -Wl,--no-check-sections -u call_user_start -Wl,-static -Wl,--gc-sections
 
 # linker script used for the above linker step
 LD_SCRIPT 	:= build/eagle.esphttpd.v6.ld

httpd/httpd.c

@@ -19,7 +19,7 @@ Esp8266 http server - core routines
 //Max length of request head
 #define MAX_HEAD_LEN 1024
 //Max amount of connections
-#define MAX_CONN 8
+#define MAX_CONN 4
 //Max post buffer len
 #define MAX_POST 1024
 //Max send buffer len
@@ -543,4 +543,5 @@ void ICACHE_FLASH_ATTR httpdInit(HttpdBuiltInUrl *fixedUrls, int port) {
 	os_printf("Httpd init, conn=%p\n", &httpdConn);
 	espconn_regist_connectcb(&httpdConn, httpdConnectCb);
 	espconn_accept(&httpdConn);
+	espconn_tcp_set_max_con_allow(&httpdConn, MAX_CONN);
 }

serial/serbridge.c

@@ -281,6 +281,8 @@ static void ICACHE_FLASH_ATTR serbridgeConnectCb(void *arg) {
 	espconn_regist_reconcb(conn, serbridgeReconCb);
 	espconn_regist_disconcb(conn, serbridgeDisconCb);
 	espconn_regist_sentcb(conn, serbridgeSentCb);
+
+	espconn_set_opt(conn, ESPCONN_REUSEADDR|ESPCONN_NODELAY);
 }
 
 // callback with a buffer of characters that have arrived on the uart
@@ -320,5 +322,6 @@ void ICACHE_FLASH_ATTR serbridgeInit(int port, uint8_t reset_pin, uint8_t isp_pi
 
 	espconn_regist_connectcb(&serbridgeConn, serbridgeConnectCb);
 	espconn_accept(&serbridgeConn);
+	espconn_tcp_set_max_con_allow(&serbridgeConn, MAX_CONN);
 	espconn_regist_time(&serbridgeConn, SER_BRIDGE_TIMEOUT, 0);
 }

serial/serbridge.h

@@ -5,7 +5,7 @@
 #include <c_types.h>
 #include <espconn.h>
 
-#define MAX_CONN 5
+#define MAX_CONN 4
 #define SER_BRIDGE_TIMEOUT 28799
 
 //Max send buffer len