getsockopt()

Author: Veijo Pesonen

ESP8266Interface.cpp

@@ -485,10 +485,14 @@ nsapi_error_t ESP8266Interface::setsockopt(nsapi_socket_t handle, int level,
 {
     struct esp8266_socket *socket = (struct esp8266_socket *)handle;
 
-    if (level == NSAPI_SOCKET) {
+    if (!optlen || !socket) {
+        return NSAPI_ERROR_PARAMETER;
+    }
+
+    if (level == NSAPI_SOCKET && socket->proto == NSAPI_TCP) {
         switch (optname) {
             case NSAPI_KEEPALIVE: {
-                if(socket->connected == true) {// ESP8266 limitation, keepalive needs to be given before connecting
+                if(socket->connected) {// ESP8266 limitation, keepalive needs to be given before connecting
                     return NSAPI_ERROR_UNSUPPORTED;
                 }
 
@@ -507,6 +511,29 @@ nsapi_error_t ESP8266Interface::setsockopt(nsapi_socket_t handle, int level,
     return NSAPI_ERROR_UNSUPPORTED;
 }
 
+nsapi_error_t ESP8266Interface::getsockopt(nsapi_socket_t handle, int level, int optname, void *optval, unsigned *optlen)
+{
+    struct esp8266_socket *socket = (struct esp8266_socket *)handle;
+
+    if (!optval || !optlen || !socket) {
+        return NSAPI_ERROR_PARAMETER;
+    }
+
+    if (level == NSAPI_SOCKET && socket->proto == NSAPI_TCP) {
+        switch (optname) {
+            case NSAPI_KEEPALIVE: {
+                if(*optlen > sizeof(int)) {
+                    *optlen = sizeof(int);
+                }
+                memcpy(optval, &(socket->keepalive), *optlen);
+                return NSAPI_ERROR_OK;
+            }
+        }
+    }
+
+    return NSAPI_ERROR_UNSUPPORTED;
+}
+
 
 void ESP8266Interface::event() {
     for (int i = 0; i < ESP8266_SOCKET_COUNT; i++) {

ESP8266Interface.h

@@ -147,7 +147,7 @@ class ESP8266Interface : public NetworkStack, public WiFiInterface
      */
     using NetworkInterface::add_dns_server;
 
-    /*  Set ESP8266-specific socket options
+    /*  Set socket options
      *
      *  The setsockopt allow an application to pass stack-specific hints
      *  to the underlying stack. For unsupported options,
@@ -163,6 +163,24 @@ class ESP8266Interface : public NetworkStack, public WiFiInterface
     virtual nsapi_error_t setsockopt(nsapi_socket_t handle, int level,
             int optname, const void *optval, unsigned optlen);
 
+    /*  Get socket options
+     *
+     *  getsockopt allows an application to retrieve stack-specific options
+     *  from the underlying stack using stack-specific level and option names,
+     *  or to request generic options using levels from nsapi_socket_level_t.
+     *
+     *  For unsupported options, NSAPI_ERROR_UNSUPPORTED is returned
+     *  and the socket is unmodified.
+     *
+     *  @param level    Stack-specific protocol level or nsapi_socket_level_t
+     *  @param optname  Level-specific option name
+     *  @param optval   Destination for option value
+     *  @param optlen   Length of the option value
+     *  @return         0 on success, negative error code on failure
+     */
+    virtual nsapi_error_t getsockopt(nsapi_socket_t handle, int level, int optname,
+            void *optval, unsigned *optlen);
+
 protected:
     /** Open a socket
      *  @param handle       Handle in which to store new socket