Modified LowPowerMode functions in WiFiClass.cpp/.h for better connection stability (#1046)

* Modified LowPowerMode functions in WiFiClass.cpp/.h

* Added noLowPowerMode() in the WiFiClass::begin()/beginAP()

Author: brabl2

libraries/WiFi/keywords.txt

@@ -57,7 +57,8 @@ beginEnterprise	KEYWORD2
 setHostname	KEYWORD2
 end	KEYWORD2
 getTime	KEYWORD2
-lowPowerMode	KEYWORD2
+aggressiveLowPowerMode	KEYWORD2
+defaultLowPowerMode	KEYWORD2
 noLowPowerMode	KEYWORD2
 ping	KEYWORD2
 beginMulticast	KEYWORD2

libraries/WiFi/src/WiFiClass.cpp

@@ -99,6 +99,7 @@ int WiFiClass::begin(const char* ssid, const char *passphrase) {
     if (!_wifi.begin()) {
         return WL_IDLE_STATUS;
     }
+    noLowPowerMode();
     // Enable CYW43 event debugging (make sure Debug Port is set)
     //cyw43_state.trace_flags = 0xffff;
     while (!_calledESP && ((millis() - start < (uint32_t)2 * _timeout)) && !connected()) {
@@ -134,6 +135,7 @@ uint8_t WiFiClass::beginAP(const char *ssid, const char* passphrase) {
     if (!_wifi.begin()) {
         return WL_IDLE_STATUS;
     }
+    noLowPowerMode();
     IPAddress gw = _wifi.gatewayIP();
     if (!gw.isSet()) {
         gw = IPAddress(192, 168, 42, 1);
@@ -565,14 +567,19 @@ unsigned long WiFiClass::getTime() {
     return millis();
 }
 
-void WiFiClass::lowPowerMode() {
+void WiFiClass::aggressiveLowPowerMode() {
     cyw43_wifi_pm(&cyw43_state, CYW43_AGGRESSIVE_PM);
 }
 
-void WiFiClass::noLowPowerMode() {
+void WiFiClass::defaultLowPowerMode() {
     cyw43_wifi_pm(&cyw43_state, CYW43_DEFAULT_PM);
 }
 
+// The difference between the default CYW43_DEFAULT_PM (0xA11142) and not low power (0xA11140) is that it changed from "Powersave mode on specified interface with High throughput" to "No Powersave mode". All other parameters stayed the same.
+void WiFiClass::noLowPowerMode() {
+    cyw43_wifi_pm(&cyw43_state, 0xA11140);
+}
+
 int WiFiClass::ping(const char* hostname, uint8_t ttl) {
     IPAddress ip;
     if (!hostByName(hostname, ip)) {

libraries/WiFi/src/WiFiClass.h

@@ -368,7 +368,8 @@ class WiFiClass {
 
     unsigned long getTime();
 
-    void lowPowerMode();
+    void aggressiveLowPowerMode();
+    void defaultLowPowerMode();
     void noLowPowerMode();
 
     int ping(const char* hostname, uint8_t ttl = 128);