WiFi: Decuple IP stack bringup and IP address provisioning

features/net/FEATURE_IPV4/lwip-interface/LWIPIPStack.cpp

@@ -34,6 +34,16 @@ void IPStackInterface::bringdown()
     lwip_bringdown();
 }
 
+int IPStackInterface::start_dhcp(uint timeout)
+{
+    return lwip_start_dhcp(timeout);
+}
+
+int IPStackINterface::start_static_ip(const char *ip, const char *netmask, const char *gw)
+{
+    return lwip_start_static_ip();
+}
+
 const char * IPStackInterface::get_mac_address()
 {
     return lwip_get_mac_address();

features/net/FEATURE_IPV4/lwip-interface/lwip_stack.c

@@ -403,7 +403,7 @@ int lwip_bringup(emac_interface_t *emac, bool dhcp, const char *ip, const char *
     }
 
     // Zero out socket set
-    lwip_arena_init();
+    lwip_arena_init(15000);
 
 #if LWIP_IPV6
     netif_create_ip6_linklocal_address(&lwip_netif, 1/*from MAC*/);
@@ -510,10 +510,6 @@ int lwip_bringdown(void)
     }
 #endif
 
-    lwip_connected = false;
-    // TO DO - actually remove addresses from stack, and shut down properly
-    return 0;
-}
 
 /* LWIP error remapping */
 static int lwip_err_remap(err_t err) {

features/net/network-socket/IPStackInterface.h

@@ -43,6 +43,24 @@ public:
      */
     virtual void bringdown();
 
+    /**
+     * Sends the dhcp request
+     *
+     * @param timeout Request timeout in ms
+     * @return NSAPI_ERROR_OK in case of success, error code otherwise
+     */
+    virtual int start_dhcp(uint timeout = 15000);
+
+    /**
+     * Starts the interface with static IP
+     *
+     * @param  ip      Static IP to use (in XYZ.XYZ.XYZ.XYZ format)
+     * @param  netmask Network mask to use (in XYZ.XYZ.XYZ.XYZ format)
+     * @param  gw      Gateway IP address (in XYZ.XYZ.XYZ.XYZ format)
+     * @return         NSAPI_ERROR_OK in case of success, error code otherwise
+     */
+    virtual int start_static_ip(const char *ip, const char *netmask, const char *gw);
+
     /**
      * Returns  MAC address
      *