diff --git a/Sming/Arch/Esp8266/Components/driver/SerialBuffer.h b/Sming/Arch/Esp8266/Components/driver/SerialBuffer.h
index f2df1f9a49..71a626c900 100644
--- a/Sming/Arch/Esp8266/Components/driver/SerialBuffer.h
+++ b/Sming/Arch/Esp8266/Components/driver/SerialBuffer.h
@@ -23,7 +23,7 @@ struct SerialBuffer {
 public:
 	~SerialBuffer()
 	{
-		delete buffer;
+		delete[] buffer;
 	}
 
 	size_t getSize()
diff --git a/Sming/Arch/Host/Components/driver/uart.cpp b/Sming/Arch/Host/Components/driver/uart.cpp
index 9a215b3565..ee07fe2499 100644
--- a/Sming/Arch/Host/Components/driver/uart.cpp
+++ b/Sming/Arch/Host/Components/driver/uart.cpp
@@ -111,7 +111,7 @@ static bool realloc_buffer(SerialBuffer*& buffer, size_t new_size)
 {
 	if(buffer != nullptr) {
 		if(new_size == 0) {
-			uart_disable_interrupts();
+			(void)uart_disable_interrupts();
 			delete buffer;
 			buffer = nullptr;
 			uart_restore_interrupts();
@@ -207,7 +207,7 @@ size_t uart_rx_available(uart_t* uart)
 		return 0;
 	}
 
-	uart_disable_interrupts();
+	(void)uart_disable_interrupts();
 
 	size_t avail = 0;
 
@@ -260,7 +260,7 @@ size_t uart_tx_free(uart_t* uart)
 		return 0;
 	}
 
-	uart_disable_interrupts();
+	(void)uart_disable_interrupts();
 
 	size_t space = 0;
 	if(uart->tx_buffer != nullptr) {
@@ -324,7 +324,7 @@ void uart_flush(uart_t* uart, uart_mode_t mode)
 	bool flushRx = mode != UART_TX_ONLY && uart->mode != UART_TX_ONLY;
 	bool flushTx = mode != UART_RX_ONLY && uart->mode != UART_RX_ONLY;
 
-	uart_disable_interrupts();
+	(void)uart_disable_interrupts();
 	if(flushRx && uart->rx_buffer != nullptr) {
 		uart->rx_buffer->clear();
 	}
diff --git a/Sming/Arch/Host/Components/hostlib/hostlib.c b/Sming/Arch/Host/Components/hostlib/hostlib.c
index 0647390804..4fc60673c8 100644
--- a/Sming/Arch/Host/Components/hostlib/hostlib.c
+++ b/Sming/Arch/Host/Components/hostlib/hostlib.c
@@ -31,7 +31,7 @@ int msleep(unsigned ms)
 
 void getHostAppDir(char* path, size_t bufSize)
 {
-	size_t len __attribute__((unused));
+	size_t len;
 	char sep;
 #ifdef __WIN32
 	len = GetModuleFileName(NULL, path, bufSize);
@@ -40,6 +40,7 @@ void getHostAppDir(char* path, size_t bufSize)
 	len = readlink("/proc/self/exe", path, bufSize);
 	sep = '/';
 #endif
+	path[len] = '\0';
 	char* p = strrchr(path, sep);
 	if(p) {
 		p[1] = '\0';
diff --git a/Sming/Arch/Host/Components/hostlib/keyb.cpp b/Sming/Arch/Host/Components/hostlib/keyb.cpp
index e59c5965e2..6106bca104 100644
--- a/Sming/Arch/Host/Components/hostlib/keyb.cpp
+++ b/Sming/Arch/Host/Components/hostlib/keyb.cpp
@@ -233,7 +233,7 @@ void keyb_restore()
 		attr.c_lflag |= ICANON | ECHO;
 		tcsetattr(STDIN_FILENO, TCSANOW, &attr);
 
-		fcntl(0, F_SETFL, g_orig_flags);
+		(void)fcntl(0, F_SETFL, g_orig_flags);
 		g_values_changed = false;
 	}
 #endif
@@ -250,7 +250,7 @@ void keyb_raw()
 	}
 
 	// make stdin non-blocking
-	fcntl(0, F_SETFL, g_orig_flags | O_NONBLOCK);
+	(void)fcntl(0, F_SETFL, g_orig_flags | O_NONBLOCK);
 	//
 	struct termios attr = g_orig_attr;
 	attr.c_lflag &= ~(ICANON | ECHO);
diff --git a/Sming/Arch/Host/Components/hostlib/sockets.cpp b/Sming/Arch/Host/Components/hostlib/sockets.cpp
index 72526beb74..6a56c10851 100644
--- a/Sming/Arch/Host/Components/hostlib/sockets.cpp
+++ b/Sming/Arch/Host/Components/hostlib/sockets.cpp
@@ -441,7 +441,7 @@ CSocket* CServerSocket::try_connect()
 	struct sockaddr sa;
 	socklen_t len = sizeof(sa);
 	int fd = ::accept(m_fd, &sa, &len);
-	if(fd <= 0) {
+	if(fd < 0) {
 		return nullptr;
 	}
 
diff --git a/Sming/Arch/Host/Components/hostlib/startup.cpp b/Sming/Arch/Host/Components/hostlib/startup.cpp
index 35c4898bee..d25695ba25 100644
--- a/Sming/Arch/Host/Components/hostlib/startup.cpp
+++ b/Sming/Arch/Host/Components/hostlib/startup.cpp
@@ -94,7 +94,7 @@ static void pause(int secs)
 {
 	if(secs == 0) {
 		hostmsg("Hit ENTER to continue.");
-		getchar();
+		(void)getchar();
 	} else if(secs > 0) {
 		hostmsg("Waiting for %u seconds...", secs);
 		msleep(secs * 1000);
diff --git a/Sming/Arch/Host/Components/lwip/.patches/lwip.patch b/Sming/Arch/Host/Components/lwip/.patches/lwip.patch
index 69c84e2c93..483d7850ac 100644
--- a/Sming/Arch/Host/Components/lwip/.patches/lwip.patch
+++ b/Sming/Arch/Host/Components/lwip/.patches/lwip.patch
@@ -1,8 +1,22 @@
 diff --git a/contrib/ports/unix/port/sys_arch.c b/contrib/ports/unix/port/sys_arch.c
-index a56d7de1..dd3f16e1 100644
+index a56d7de1..6fc9f434 100644
 --- a/contrib/ports/unix/port/sys_arch.c
 +++ b/contrib/ports/unix/port/sys_arch.c
-@@ -730,13 +730,3 @@ sys_arch_unprotect(sys_prot_t pval)
+@@ -68,10 +68,12 @@
+ #include "lwip/stats.h"
+ #include "lwip/tcpip.h"
+ 
++extern u32_t os_random(void);
++
+ u32_t
+ lwip_port_rand(void)
+ {
+-  return (u32_t)rand();
++  return os_random();
+ }
+ 
+ static void
+@@ -730,13 +732,3 @@ sys_arch_unprotect(sys_prot_t pval)
  }
  #endif /* SYS_LIGHTWEIGHT_PROT */
  
diff --git a/Sming/Arch/Host/Components/lwip/Linux/host_lwip.c b/Sming/Arch/Host/Components/lwip/Linux/host_lwip.c
index 3c09929244..9ec7255be3 100644
--- a/Sming/Arch/Host/Components/lwip/Linux/host_lwip.c
+++ b/Sming/Arch/Host/Components/lwip/Linux/host_lwip.c
@@ -49,13 +49,17 @@ static void getMacAddress(const char* ifname, uint8_t hwaddr[6])
 {
 	struct ifreq ifr = {0};
 	ifr.ifr_addr.sa_family = AF_INET;
-	strcpy(ifr.ifr_name, ifname);
+	strncpy(ifr.ifr_name, ifname, IFNAMSIZ);
 
 	int fd = socket(AF_INET, SOCK_DGRAM, 0);
-	ioctl(fd, SIOCGIFHWADDR, &ifr);
+	int res = ioctl(fd, SIOCGIFHWADDR, &ifr);
 	close(fd);
 
-	memcpy(hwaddr, ifr.ifr_hwaddr.sa_data, 6);
+	if(res == 0) {
+		memcpy(hwaddr, ifr.ifr_hwaddr.sa_data, 6);
+	} else {
+		memset(hwaddr, 0, 6);
+	}
 }
 
 /**
@@ -127,7 +131,7 @@ bool host_lwip_init(const struct lwip_param* param)
 
 	if(param->ipaddr == NULL) {
 		// Choose a default IP address
-		IP4_ADDR(&netcfg.ipaddr, ip4_addr1(&netcfg.gw), ip4_addr2(&netcfg.gw), ip4_addr3(&netcfg.gw), 10);
+		IP4_ADDR(&netcfg.ipaddr, (uint32_t)ip4_addr1(&netcfg.gw), (uint32_t)ip4_addr2(&netcfg.gw), (uint32_t)ip4_addr3(&netcfg.gw), 10U);
 	} else if(ip4addr_aton(param->ipaddr, &netcfg.ipaddr) != 1) {
 		hostmsg("Failed to parse provided IP address '%s'", param->ipaddr);
 		return false;
diff --git a/Sming/Arch/Host/Components/spi_flash/flashmem.cpp b/Sming/Arch/Host/Components/spi_flash/flashmem.cpp
index 188dd827bc..e56480705b 100644
--- a/Sming/Arch/Host/Components/spi_flash/flashmem.cpp
+++ b/Sming/Arch/Host/Components/spi_flash/flashmem.cpp
@@ -39,10 +39,10 @@ static const char* defaultFlashFileName = "flash.bin";
 bool host_flashmem_init(FlashmemConfig& config)
 {
 	if(config.filename != nullptr) {
-		strcpy(flashFileName, config.filename);
+		strncpy(flashFileName, config.filename, sizeof(flashFileName));
 	} else {
 		getHostAppDir(flashFileName, sizeof(flashFileName));
-		strcat(flashFileName, defaultFlashFileName);
+		strcpy(flashFileName, defaultFlashFileName);
 		config.filename = flashFileName;
 	}
 
diff --git a/Sming/Arch/Host/Core/DigitalHooks.cpp b/Sming/Arch/Host/Core/DigitalHooks.cpp
index bed86d9aae..8e25cad702 100644
--- a/Sming/Arch/Host/Core/DigitalHooks.cpp
+++ b/Sming/Arch/Host/Core/DigitalHooks.cpp
@@ -40,6 +40,6 @@ void DigitalHooks::pullup(uint16_t pin, bool enable)
 
 unsigned long DigitalHooks::pulseIn(uint16_t pin, uint8_t state, unsigned long timeout)
 {
-	host_printfp("pin: %u, state: %u, timeout: %u\n", __FUNCTION__, pin, state, timeout);
+	host_printfp("pin: %u, state: %u, timeout: %lu\n", __FUNCTION__, pin, state, timeout);
 	return 0;
 }
diff --git a/Sming/Arch/Host/Core/HardwarePWM.cpp b/Sming/Arch/Host/Core/HardwarePWM.cpp
index b974970e21..876e6f2fee 100644
--- a/Sming/Arch/Host/Core/HardwarePWM.cpp
+++ b/Sming/Arch/Host/Core/HardwarePWM.cpp
@@ -25,7 +25,7 @@
 
 #include <HardwarePWM.h>
 
-HardwarePWM::HardwarePWM(uint8_t* pins, uint8_t no_of_pins) : channel_count(no_of_pins)
+HardwarePWM::HardwarePWM(uint8_t* pins, uint8_t no_of_pins) : channel_count(no_of_pins), maxduty(0)
 {
 }
 
diff --git a/Sming/Components/.patches/ws_parser.patch b/Sming/Components/.patches/ws_parser.patch
index c7fc5bf08e..c1bfd3aba0 100644
--- a/Sming/Components/.patches/ws_parser.patch
+++ b/Sming/Components/.patches/ws_parser.patch
@@ -1,8 +1,24 @@
 diff --git a/ws_parser.c b/ws_parser.c
-index 88e4810..3da68e1 100644
+index 88e4810..e2d1147 100644
 --- a/ws_parser.c
 +++ b/ws_parser.c
-@@ -244,7 +244,8 @@ ws_parser_execute(ws_parser_t* parser, /* mutates! */ char* buff, size_t len)
+@@ -3,6 +3,7 @@
+ #endif
+ 
+ #include "ws_parser.h"
++#include <string.h>
+ 
+ enum {
+     S_OPCODE = 0,
+@@ -27,6 +28,7 @@ enum {
+ void
+ ws_parser_init(ws_parser_t* parser, const ws_parser_callbacks_t* callbacks)
+ {
++	memset(parser, 0, sizeof(ws_parser_t));
+     parser->user_data = NULL;
+     parser->callbacks = callbacks;
+     parser->state = S_OPCODE;
+@@ -244,7 +246,8 @@ ws_parser_execute(ws_parser_t* parser, /* mutates! */ char* buff, size_t len)
                  }
  
                  if(parser->mask_flag) {
diff --git a/Sming/Core/Data/Stream/FileStream.cpp b/Sming/Core/Data/Stream/FileStream.cpp
index c1d5be82e6..a5ddbee884 100644
--- a/Sming/Core/Data/Stream/FileStream.cpp
+++ b/Sming/Core/Data/Stream/FileStream.cpp
@@ -63,10 +63,10 @@ uint16_t FileStream::readMemoryBlock(char* data, int bufSize)
 	}
 
 	int available = fileRead(handle, data, std::min(size - pos, size_t(bufSize)));
-	check(available);
+	(void)check(available);
 
 	// Don't move cursor now (waiting seek)
-	fileSeek(handle, pos, eSO_FileStart);
+	(void)fileSeek(handle, pos, eSO_FileStart);
 
 	return available > 0 ? available : 0;
 }
diff --git a/Sming/Core/Data/Stream/GdbFileStream.cpp b/Sming/Core/Data/Stream/GdbFileStream.cpp
index a0721524a5..8ff135ac0a 100644
--- a/Sming/Core/Data/Stream/GdbFileStream.cpp
+++ b/Sming/Core/Data/Stream/GdbFileStream.cpp
@@ -74,10 +74,10 @@ uint16_t GdbFileStream::readMemoryBlock(char* data, int bufSize)
 	}
 
 	int available = gdb_syscall_read(handle, data, std::min(size - pos, size_t(bufSize)));
-	check(available);
+	(void)check(available);
 
 	// Don't move cursor now (waiting seek)
-	gdb_syscall_lseek(handle, pos, SEEK_SET);
+	(void)gdb_syscall_lseek(handle, pos, SEEK_SET);
 
 	return available > 0 ? available : 0;
 }
diff --git a/Sming/Core/HardwareSerial.cpp b/Sming/Core/HardwareSerial.cpp
index ca2ba52ef7..952266ac19 100644
--- a/Sming/Core/HardwareSerial.cpp
+++ b/Sming/Core/HardwareSerial.cpp
@@ -105,7 +105,7 @@ void HardwareSerial::systemDebugOutput(bool enabled)
 
 void HardwareSerial::invokeCallbacks()
 {
-	uart_disable_interrupts();
+	(void)uart_disable_interrupts();
 	auto status = callbackStatus;
 	callbackStatus = 0;
 	callbackQueued = false;