Fix error in WiFiClient.cpp where the connect function fails for timeouts below 1 second (#7686)

* Update WiFiClient.cpp

This change will allow specifying connect timeouts below 1 second. Without this change, if connect timeouts under 1 second are given, the connect defaults to 0ms and fails. 
This will also allow timeouts in fractions of seconds, e.g. 1500ms. Without this change, connect timeouts are truncated to full second increments.

* Make parameter timeout_ms clear

* Change connection timeout_ms name for clarity

---------
Co-authored-by: Rodrigo Garcia <rodrigo.garcia@espressif.com>

libraries/WiFi/src/WiFiClient.cpp

@@ -210,9 +210,9 @@ int WiFiClient::connect(IPAddress ip, uint16_t port)
 {
     return connect(ip,port,_timeout);
 }
-int WiFiClient::connect(IPAddress ip, uint16_t port, int32_t timeout)
+int WiFiClient::connect(IPAddress ip, uint16_t port, int32_t timeout_ms)
 {
-    _timeout = timeout;
+    _timeout = timeout_ms;
     int sockfd = socket(AF_INET, SOCK_STREAM, 0);
     if (sockfd < 0) {
         log_e("socket: %d", errno);
@@ -231,7 +231,7 @@ int WiFiClient::connect(IPAddress ip, uint16_t port, int32_t timeout)
     FD_ZERO(&fdset);
     FD_SET(sockfd, &fdset);
     tv.tv_sec = _timeout / 1000;
-    tv.tv_usec = 0;
+    tv.tv_usec = (_timeout  % 1000) * 1000;
 
 #ifdef ESP_IDF_VERSION_MAJOR
     int res = lwip_connect(sockfd, (struct sockaddr*)&serveraddr, sizeof(serveraddr));
@@ -292,13 +292,13 @@ int WiFiClient::connect(const char *host, uint16_t port)
     return connect(host,port,_timeout);
 }
 
-int WiFiClient::connect(const char *host, uint16_t port, int32_t timeout)
+int WiFiClient::connect(const char *host, uint16_t port, int32_t timeout_ms)
 {
     IPAddress srv((uint32_t)0);
     if(!WiFiGenericClass::hostByName(host, srv)){
         return 0;
     }
-    return connect(srv, port, timeout);
+    return connect(srv, port, timeout_ms);
 }
 
 int WiFiClient::setSocketOption(int option, char* value, size_t len)

libraries/WiFi/src/WiFiClient.h

@@ -50,9 +50,9 @@ public:
     WiFiClient(int fd);
     ~WiFiClient();
     int connect(IPAddress ip, uint16_t port);
-    int connect(IPAddress ip, uint16_t port, int32_t timeout);
+    int connect(IPAddress ip, uint16_t port, int32_t timeout_ms);
     int connect(const char *host, uint16_t port);
-    int connect(const char *host, uint16_t port, int32_t timeout);
+    int connect(const char *host, uint16_t port, int32_t timeout_ms);
     size_t write(uint8_t data);
     size_t write(const uint8_t *buf, size_t size);
     size_t write_P(PGM_P buf, size_t size);