[realtek-ambz] Fix (some) WiFi crashes

arduino/libretuya/api/WiFiClient.h

@@ -28,9 +28,7 @@ class IWiFiClient : public Client {
 
 	IWiFiClient(int sock) {}
 
-	~IWiFiClient() {
-		stop();
-	}
+	~IWiFiClient() {}
 
 	virtual int connect(IPAddress ip, uint16_t port, int32_t timeout)	  = 0;
 	virtual int connect(const char *host, uint16_t port, int32_t timeout) = 0;
@@ -70,5 +68,4 @@ class IWiFiClient : public Client {
 	virtual uint16_t localPort(int sock) const	= 0;
 
 	using Print::write;
-	using Client::stop;
 };

arduino/realtek-ambz/cores/arduino/hooks.c

@@ -28,7 +28,12 @@
 static void __empty() {
 	// Empty
 }
-void yield(void) __attribute__ ((weak, alias("__empty")));
+
+#include "cmsis_os.h"
+
+void yield(void) {
+  taskYIELD();
+}
 
 /**
  * SysTick hook

arduino/realtek-ambz/libraries/WiFi/WiFiAP.cpp

@@ -5,6 +5,8 @@ bool WiFiClass::softAP(const char *ssid, const char *passphrase, int channel, bo
 	if (!enableAP(true))
 		return false;
 
+	vTaskDelay(20);
+
 	if (!ssid || *ssid == 0x00 || strlen(ssid) > 32)
 		return false;
 

arduino/realtek-ambz/libraries/WiFi/WiFiClient.cpp

@@ -2,7 +2,6 @@
 #include "WiFiPriv.h"
 
 WiFiClient::WiFiClient() {
-	DiagPrintf("WiFiClient()\r\n");
 	_sock	   = -1;
 	_connected = false;
 	_rxBuffer  = NULL;
@@ -16,6 +15,10 @@ WiFiClient::WiFiClient(int sock) {
 	_timeout   = WIFI_CLIENT_CONNECT_TIMEOUT;
 }
 
+WiFiClient::~WiFiClient() {
+	stop();
+}
+
 WiFiClient &WiFiClient::operator=(const IWiFiClient &other) {
 	stop();
 	WiFiClient *oth = (WiFiClient *)&other;
@@ -254,14 +257,14 @@ void WiFiClient::stop() {
 		lwip_close(_sock);
 	_sock	   = -1;
 	_connected = false;
-	free(_rxBuffer);
+	delete _rxBuffer;
 	_rxBuffer = NULL;
 }
 
 uint8_t WiFiClient::connected() {
 	if (_connected) {
 		uint8_t dummy;
-		if (lwip_recv(_sock, &dummy, 0, MSG_DONTWAIT) < 0) {
+		if (lwip_recv(_sock, &dummy, 0, MSG_DONTWAIT) <= 0) {
 			switch (errno) {
 				case EWOULDBLOCK:
 				case ENOENT: // caused by vfs

arduino/realtek-ambz/libraries/WiFi/WiFiClient.h

@@ -12,6 +12,7 @@ class WiFiClient : public IWiFiClient {
   public:
 	WiFiClient();
 	WiFiClient(int sock);
+	~WiFiClient();
 
 	int connect(IPAddress ip, uint16_t port);
 	int connect(const char *host, uint16_t port);

arduino/realtek-ambz/libraries/WiFi/WiFiServer.cpp

@@ -51,7 +51,7 @@ WiFiClient WiFiServer::accept() {
 		return WiFiClient();
 
 	int sock;
-	if (_sockAccepted) {
+	if (_sockAccepted >= 0) {
 		sock		  = _sockAccepted;
 		_sockAccepted = -1;
 	} else {