text: /* Copyright (c) 2017 ARM Limited
   *
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   *     http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  
  #define __STDC_LIMIT_MACROS
  
  #include "nsapi.h"
  #include "mbed_interface.h"
  #include "mbed_assert.h"
  #include <stdio.h>
  #include <stdbool.h>
  #include <string.h>
  #include <new>
  #include <stdint.h>
  
  #include "lwip/opt.h"
  #include "lwip/api.h"
  #include "lwip/inet.h"
  #include "lwip/netif.h"
  #include "lwip/dhcp.h"
  #include "lwip/tcpip.h"
  #include "lwip/tcp.h"
  #include "lwip/ip.h"
  #include "lwip/mld6.h"
  #include "lwip/dns.h"
  #include "lwip/udp.h"
  
  #include "ppp_lwip.h"
  
  #include "LWIPStack.h"
  
  LWIP::Interface *LWIP::Interface::list;
  
  LWIP::Interface *LWIP::Interface::our_if_from_netif(struct netif *netif)
  {
      for (Interface *interface = list; interface; interface = interface->next) {
          if (netif == &interface->netif) {
              return interface;
          }
      }
  
      return NULL;
  }
  
  static void add_dns_addr_to_dns_list_index(const u8_t addr_type, const u8_t index)
  {
  #if LWIP_IPV6
      if (addr_type == IPADDR_TYPE_V6) {
          /* 2001:4860:4860::8888 google */
          ip_addr_t ipv6_dns_addr = IPADDR6_INIT(
                                        PP_HTONL(0x20014860UL),
                                        PP_HTONL(0x48600000UL),
                                        PP_HTONL(0x00000000UL),
                                        PP_HTONL(0x00008888UL));
          dns_setserver(index, &ipv6_dns_addr);
      }
  #endif
  #if LWIP_IPV4
      if (addr_type == IPADDR_TYPE_V4) {
          /* 8.8.8.8 google */
          ip_addr_t ipv4_dns_addr = IPADDR4_INIT(0x08080808);
          dns_setserver(index, &ipv4_dns_addr);
      }
  #endif
  }
  
  static int get_ip_addr_type(const ip_addr_t *ip_addr)
  {
  #if LWIP_IPV6
      if (IP_IS_V6(ip_addr)) {
          return IPADDR_TYPE_V6;
      }
  #endif
  #if LWIP_IPV4
      if (IP_IS_V4(ip_addr)) {
          return IPADDR_TYPE_V4;
      }
  #endif
  #if LWIP_IPV6 && LWIP_IPV4
      return IPADDR_TYPE_ANY;
  #endif
  }
  
  void LWIP::add_dns_addr(struct netif *lwip_netif)
  {
      // Check for existing dns address
      for (char numdns = 0; numdns < DNS_MAX_SERVERS; numdns++) {
          const ip_addr_t *dns_ip_addr = dns_getserver(numdns);
          if (!ip_addr_isany(dns_ip_addr)) {
              return;
          }
      }
  
      // Get preferred ip version
      const ip_addr_t *ip_addr = get_ip_addr(false, lwip_netif);
      u8_t addr_type = IPADDR_TYPE_ANY;
  
      // Add preferred ip version dns address to index 0
      if (ip_addr) {
          addr_type = get_ip_addr_type(ip_addr);
          add_dns_addr_to_dns_list_index(addr_type, 0);
      }
  
  #if LWIP_IPV4 && LWIP_IPV6
      if (!ip_addr) {
          // Get address for any ip version
          ip_addr = get_ip_addr(true, lwip_netif);
          if (!ip_addr) {
              return;
          }
          addr_type = get_ip_addr_type(ip_addr);
          // Add the dns address to index 0
          add_dns_addr_to_dns_list_index(addr_type, 0);
      }
  
      if (addr_type == IPADDR_TYPE_V4) {
          // If ipv4 is preferred and ipv6 is available add ipv6 dns address to index 1
          ip_addr = get_ipv6_addr(lwip_netif);
      } else if (addr_type == IPADDR_TYPE_V6) {
          // If ipv6 is preferred and ipv4 is available add ipv4 dns address to index 1
          ip_addr = get_ipv4_addr(lwip_netif);
      } else {
          ip_addr = NULL;
      }
  
      if (ip_addr) {
          addr_type = get_ip_addr_type(ip_addr);
          add_dns_addr_to_dns_list_index(addr_type, 1);
      }
  #endif
  }
  
  nsapi_error_t LWIP::Interface::set_dhcp()
  {
      netif_set_up(&netif);
  
  #if LWIP_DHCP
      if (dhcp_has_to_be_set) {
          err_t err = dhcp_start(&netif);
          dhcp_has_to_be_set = false;
          if (err) {
              connected = NSAPI_STATUS_DISCONNECTED;
              if (client_callback) {
                  client_callback(NSAPI_EVENT_CONNECTION_STATUS_CHANGE, NSAPI_STATUS_DISCONNECTED);
              }
              return NSAPI_ERROR_DHCP_FAILURE;
          }
          dhcp_started = true;
      }
  #endif
  
      return NSAPI_ERROR_OK;
  }
  
  void LWIP::Interface::netif_link_irq(struct netif *netif)
  {
      LWIP::Interface *interface = our_if_from_netif(netif);
      nsapi_connection_status_t connectedStatusPrev = interface->connected;
  
      if (netif_is_link_up(&interface->netif) && interface->connected == NSAPI_STATUS_CONNECTING) {
          nsapi_error_t dhcp_status = interface->set_dhcp();
  
          if (interface->blocking && dhcp_status == NSAPI_ERROR_OK) {
              osSemaphoreRelease(interface->linked);
          } else if (dhcp_status != NSAPI_ERROR_OK) {
              netif_set_down(&interface->netif);
          }
      } else {
          osSemaphoreRelease(interface->unlinked);
          if (netif_is_up(&interface->netif)) {
              interface->connected = NSAPI_STATUS_CONNECTING;
          }
          netif_set_down(&interface->netif);
      }
  
      if (interface->client_callback && connectedStatusPrev != interface->connected
              && interface->connected != NSAPI_STATUS_GLOBAL_UP /* advertised by netif_status_irq */
              && interface->connected != NSAPI_STATUS_DISCONNECTED) { /* advertised by bring_down */
          interface->client_callback(NSAPI_EVENT_CONNECTION_STATUS_CHANGE, interface->connected);
      }
  }
  
  void LWIP::Interface::netif_status_irq(struct netif *netif)
  {
      LWIP::Interface *interface = our_if_from_netif(netif);
      nsapi_connection_status_t connectedStatusPrev = interface->connected;
  
      if (netif_is_up(&interface->netif) && netif_is_link_up(&interface->netif)) {
          bool dns_addr_has_to_be_added = false;
          if (!(interface->has_addr_state & HAS_ANY_ADDR) && LWIP::get_ip_addr(true, netif)) {
              if (interface->blocking) {
                  osSemaphoreRelease(interface->has_any_addr);
              }
              interface->has_addr_state |= HAS_ANY_ADDR;
              dns_addr_has_to_be_added = true;
          }
  #if PREF_ADDR_TIMEOUT
          if (!(interface->has_addr_state & HAS_PREF_ADDR) && LWIP::get_ip_addr(false, netif)) {
              if (interface->blocking) {
                  osSemaphoreRelease(interface->has_pref_addr);
              }
              interface->has_addr_state |= HAS_PREF_ADDR;
              dns_addr_has_to_be_added = true;
          }
  #endif
  #if BOTH_ADDR_TIMEOUT
          if (!(interface->has_addr_state & HAS_BOTH_ADDR) && LWIP::get_ipv4_addr(netif) && LWIP::get_ipv6_addr(netif)) {
              if (interface->blocking) {
                  osSemaphoreRelease(interface->has_both_addr);
              }
              interface->has_addr_state |= HAS_BOTH_ADDR;
              dns_addr_has_to_be_added = true;
          }
  #endif
          if (dns_addr_has_to_be_added && !interface->blocking) {
              add_dns_addr(&interface->netif);
          }
  
          if (interface->has_addr_state & HAS_ANY_ADDR) {
              interface->connected = NSAPI_STATUS_GLOBAL_UP;
          }
      } else if (!netif_is_up(&interface->netif) && netif_is_link_up(&interface->netif)) {
          interface->connected = NSAPI_STATUS_DISCONNECTED;
      }
  
      if (interface->client_callback && (connectedStatusPrev != interface->connected)
              && interface->connected != NSAPI_STATUS_DISCONNECTED) { /* advertised by bring_down */
          interface->client_callback(NSAPI_EVENT_CONNECTION_STATUS_CHANGE, interface->connected);
      }
  }
  
  void LWIP::Interface::attach(mbed::Callback<void(nsapi_event_t, intptr_t)> status_cb)
  {
      client_callback = status_cb;
  }
  
  nsapi_connection_status_t LWIP::Interface::get_connection_status() const
  {
      return connected;
  }
  
  #if LWIP_IPV6
  static void mbed_lwip_clear_ipv6_addresses(struct netif *netif)
  {
      for (u8_t i = 0; i < LWIP_IPV6_NUM_ADDRESSES; i++) {
          netif_ip6_addr_set_state(netif, i, IP6_ADDR_INVALID);
      }
  }
  #endif
  
  char *LWIP::Interface::get_mac_address(char *buf, nsapi_size_t buflen)
  {
      (void) snprintf(buf, buflen, "%02x:%02x:%02x:%02x:%02x:%02x",
                      netif.hwaddr[0], netif.hwaddr[1], netif.hwaddr[2],
                      netif.hwaddr[3], netif.hwaddr[4], netif.hwaddr[5]);
      return buf;
  }
  
  char *LWIP::Interface::get_ip_address(char *buf, nsapi_size_t buflen)
  {
      const ip_addr_t *addr = LWIP::get_ip_addr(true, &netif);
      if (!addr) {
          return NULL;
      }
  #if LWIP_IPV6
      if (IP_IS_V6(addr)) {
          return ip6addr_ntoa_r(ip_2_ip6(addr), buf, buflen);
      }
  #endif
  #if LWIP_IPV4
      if (IP_IS_V4(addr)) {
          return ip4addr_ntoa_r(ip_2_ip4(addr), buf, buflen);
      }
  #endif
  #if LWIP_IPV6 && LWIP_IPV4
      return NULL;
  #endif
  }
  
  char *LWIP::Interface::get_netmask(char *buf, nsapi_size_t buflen)
  {
  #if LWIP_IPV4
      const ip4_addr_t *addr = netif_ip4_netmask(&netif);
      if (!ip4_addr_isany(addr)) {
          return ip4addr_ntoa_r(addr, buf, buflen);
      } else {
          return NULL;
      }
  #else
      return NULL;
  #endif
  }
  
  char *LWIP::Interface::get_gateway(char *buf, nsapi_size_t buflen)
  {
  #if LWIP_IPV4
      const ip4_addr_t *addr = netif_ip4_gw(&netif);
      if (!ip4_addr_isany(addr)) {
          return ip4addr_ntoa_r(addr, buf, buflen);
      } else {
          return NULL;
      }
  #else
      return NULL;
  #endif
  }
  
  LWIP::Interface::Interface() :
      hw(NULL), has_addr_state(0),
      connected(NSAPI_STATUS_DISCONNECTED),
      dhcp_started(false), dhcp_has_to_be_set(false), blocking(true), ppp(false)
  {
      memset(&netif, 0, sizeof netif);
  
      osSemaphoreAttr_t attr;
      attr.name = NULL;
      attr.attr_bits = 0;
  
      attr.cb_mem = &linked_sem;
      attr.cb_size = sizeof linked_sem;
      linked = osSemaphoreNew(UINT16_MAX, 0, &attr);
  
      attr.cb_mem = &unlinked_sem;
      attr.cb_size = sizeof unlinked_sem;
      unlinked = osSemaphoreNew(UINT16_MAX, 0, &attr);
  
      attr.cb_mem = &has_any_addr_sem;
      attr.cb_size = sizeof has_any_addr_sem;
      has_any_addr = osSemaphoreNew(UINT16_MAX, 0, &attr);
  #if PREF_ADDR_TIMEOUT
      attr.cb_mem = &has_pref_addr_sem;
      attr.cb_size = sizeof has_pref_addr_sem;
      has_pref_addr = osSemaphoreNew(UINT16_MAX, 0, &attr);
  #endif
  #if BOTH_ADDR_TIMEOUT
      attr.cb_mem = &has_both_addr_sem;
      attr.cb_size = sizeof has_both_addr_sem;
      has_both_addr = osSemaphoreNew(UINT16_MAX, 0, &attr);
  #endif
  
      next = list;
      list = this;
  }
  
  nsapi_error_t LWIP::add_ethernet_interface(EMAC &emac, bool default_if, OnboardNetworkStack::Interface **interface_out)
  {
  #if LWIP_ETHERNET
      Interface *interface = new (std::nothrow) Interface();
      if (!interface) {
          return NSAPI_ERROR_NO_MEMORY;
      }
      interface->emac = &emac;
      interface->memory_manager = &memory_manager;
      interface->ppp = false;
  
  #if (MBED_MAC_ADDRESS_SUM != MBED_MAC_ADDR_INTERFACE)
      netif->interface.hwaddr[0] = MBED_MAC_ADDR_0;
      netif->interface.hwaddr[1] = MBED_MAC_ADDR_1;
      netif->interface.hwaddr[2] = MBED_MAC_ADDR_2;
      netif->interface.hwaddr[3] = MBED_MAC_ADDR_3;
      netif->interface.hwaddr[4] = MBED_MAC_ADDR_4;
      netif->interface.hwaddr[5] = MBED_MAC_ADDR_5;
  #else
      mbed_mac_address((char *) interface->netif.hwaddr);
  #endif
  
      interface->netif.hwaddr_len = 6;
  
      if (!netif_add(&interface->netif,
  #if LWIP_IPV4
                     0, 0, 0,
  #endif
                     interface, &LWIP::Interface::emac_if_init, tcpip_input)) {
          return NSAPI_ERROR_DEVICE_ERROR;
      }
  
      if (default_if) {
          netif_set_default(&interface->netif);
          default_interface = interface;
      }
  
      netif_set_link_callback(&interface->netif, &LWIP::Interface::netif_link_irq);
      netif_set_status_callback(&interface->netif, &LWIP::Interface::netif_status_irq);
  
      *interface_out = interface;
  
      /* Use mac address as additional seed to random number generator */
      uint64_t seed = interface->netif.hwaddr[0];
      for (uint8_t i = 1; i < 8; i++) {
          seed <<= 8;
          seed |= interface->netif.hwaddr[i % 6];
      }
      lwip_add_random_seed(seed);
  
      return NSAPI_ERROR_OK;
  #else
      return NSAPI_ERROR_UNSUPPORTED;
  #endif //LWIP_ETHERNET
  }
  
  
  nsapi_error_t LWIP::add_l3ip_interface(L3IP &l3ip, bool default_if, OnboardNetworkStack::Interface **interface_out)
  {
  #if LWIP_L3IP
      Interface *interface = new (std::nothrow) Interface();
      if (!interface) {
          return NSAPI_ERROR_NO_MEMORY;
      }
      interface->l3ip = &l3ip;
      interface->memory_manager = &memory_manager;
      interface->ppp = false;
  
  
  
      // interface->netif.hwaddr_len = 0; should we set?
  
      if (!netif_add(&interface->netif,
  #if LWIP_IPV4
                     0, 0, 0,
  #endif
                     interface, &LWIP::Interface::emac_if_init, ip_input)) {
          return NSAPI_ERROR_DEVICE_ERROR;
      }
  
      if (default_if) {
          netif_set_default(&interface->netif);
          default_interface = interface;
      }
  
      netif_set_link_callback(&interface->netif, &LWIP::Interface::netif_link_irq);
      netif_set_status_callback(&interface->netif, &LWIP::Interface::netif_status_irq);
  
      *interface_out = interface;
  
  
      //lwip_add_random_seed(seed); to do?
  
      return NSAPI_ERROR_OK;
  
  #else
      return NSAPI_ERROR_UNSUPPORTED;
  
  #endif //LWIP_L3IP
  }
  
  nsapi_error_t LWIP::remove_l3ip_interface(OnboardNetworkStack::Interface **interface_out)
  {
  #if LWIP_L3IP
      return NSAPI_ERROR_OK;
  #else
      return NSAPI_ERROR_UNSUPPORTED;
  
  #endif //LWIP_L3IP
  }
  /* Internal API to preserve existing PPP functionality - revise to better match mbed_ipstak_add_ethernet_interface later */
  nsapi_error_t LWIP::_add_ppp_interface(void *hw, bool default_if, nsapi_ip_stack_t stack, LWIP::Interface **interface_out)
  {
  #if LWIP_PPP_API
      Interface *interface = new (std::nothrow) Interface();
      if (!interface) {
          return NSAPI_ERROR_NO_MEMORY;
      }
      interface->hw = hw;
      interface->ppp = true;
  
      nsapi_error_t ret = ppp_lwip_if_init(hw, &interface->netif, stack);
      if (ret != NSAPI_ERROR_OK) {
          free(interface);
          return ret;
      }
  
      if (default_if) {
          netif_set_default(&interface->netif);
          default_interface = interface;
      }
  
      netif_set_link_callback(&interface->netif, &LWIP::Interface::netif_link_irq);
      netif_set_status_callback(&interface->netif, &LWIP::Interface::netif_status_irq);
  
      *interface_out = interface;
  
      return NSAPI_ERROR_OK;
  #else
      return NSAPI_ERROR_UNSUPPORTED;
  #endif //LWIP_PPP_API
  }
  
  
  nsapi_error_t LWIP::Interface::bringup(bool dhcp, const char *ip, const char *netmask, const char *gw, const nsapi_ip_stack_t stack, bool block)
  {
      // Check if we've already connected
      if (connected == NSAPI_STATUS_GLOBAL_UP) {
          return NSAPI_ERROR_IS_CONNECTED;
      } else if (connected == NSAPI_STATUS_CONNECTING) {
          return NSAPI_ERROR_BUSY;
      }
  
      connected = NSAPI_STATUS_CONNECTING;
      blocking = block;
  
  #if LWIP_DHCP
      if (stack != IPV6_STACK && dhcp) {
          dhcp_has_to_be_set = true;
      }
  #endif
  
  #if LWIP_IPV6
      if (stack != IPV4_STACK) {
          if (netif.hwaddr_len == 6) {
              netif_create_ip6_linklocal_address(&netif, 1/*from MAC*/);
          }
  #if LWIP_IPV6_MLD
          /*
           * For hardware/netifs that implement MAC filtering.
           * All-nodes link-local is handled by default, so we must let the hardware know
           * to allow multicast packets in.
           * Should set mld_mac_filter previously. */
          if (netif.mld_mac_filter != NULL) {
              ip6_addr_t ip6_allnodes_ll;
              ip6_addr_set_allnodes_linklocal(&ip6_allnodes_ll);
              netif.mld_mac_filter(&netif, &ip6_allnodes_ll, NETIF_ADD_MAC_FILTER);
          }
  #endif /* LWIP_IPV6_MLD */
  
  #if LWIP_IPV6_AUTOCONFIG
          /* IPv6 address autoconfiguration not enabled by default */
          netif.ip6_autoconfig_enabled = 1;
  #endif /* LWIP_IPV6_AUTOCONFIG */
      } else {
          // Disable rourter solicitations
          netif.rs_count = 0;
      }
  #endif /* LWIP_IPV6 */
  
  #if LWIP_IPV4
      if (stack != IPV6_STACK) {
          if (!dhcp && !ppp) {
              ip4_addr_t ip_addr;
              ip4_addr_t netmask_addr;
              ip4_addr_t gw_addr;
  
              if (!inet_aton(ip, &ip_addr) ||
                      !inet_aton(netmask, &netmask_addr) ||
                      !inet_aton(gw, &gw_addr)) {
                  return NSAPI_ERROR_PARAMETER;
              }
  
              netif_set_addr(&netif, &ip_addr, &netmask_addr, &gw_addr);
          }
      }
  #endif
  
      if (client_callback) {
          client_callback(NSAPI_EVENT_CONNECTION_STATUS_CHANGE, NSAPI_STATUS_CONNECTING);
      }
  
      if (ppp) {
          err_t err = ppp_lwip_connect(hw);
          if (err) {
              connected = NSAPI_STATUS_DISCONNECTED;
              if (client_callback) {
                  client_callback(NSAPI_EVENT_CONNECTION_STATUS_CHANGE, NSAPI_STATUS_DISCONNECTED);
              }
              return err_remap(err);
          }
      }
  
      if (!netif_is_link_up(&netif)) {
          if (blocking) {
              if (osSemaphoreAcquire(linked, 15000) != osOK) {
                  if (ppp) {
                      (void) ppp_lwip_disconnect(hw);
                  }
                  return NSAPI_ERROR_NO_CONNECTION;
              }
          }
      } else {
          nsapi_error_t ret = set_dhcp();
          if (ret != NSAPI_ERROR_OK) {
              return ret;
          }
      }
  
      if (!blocking) {
          // Done enough - as addresses are acquired, there will be
          // connected callbacks.
          return NSAPI_ERROR_OK;
      }
  
      // If doesn't have address
      if (!LWIP::get_ip_addr(true, &netif)) {
          if (osSemaphoreAcquire(has_any_addr, DHCP_TIMEOUT * 1000) != osOK) {
              if (ppp) {
                  (void) ppp_lwip_disconnect(hw);
              }
              return NSAPI_ERROR_DHCP_FAILURE;
          }
      }
  
  #if PREF_ADDR_TIMEOUT
      if (stack != IPV4_STACK && stack != IPV6_STACK) {
          // If address is not for preferred stack waits a while to see
          // if preferred stack address is acquired
          if (!LWIP::get_ip_addr(false, &netif)) {
              osSemaphoreAcquire(has_pref_addr, PREF_ADDR_TIMEOUT * 1000);
          }
      }
  #endif
  #if BOTH_ADDR_TIMEOUT
      if (stack != IPV4_STACK && stack != IPV6_STACK) {
          // If addresses for both stacks are not available waits a while to
          // see if address for both stacks are acquired
          if (!(LWIP::get_ipv4_addr(&netif) && LWIP::get_ipv6_addr(&netif))) {
              osSemaphoreAcquire(has_both_addr, BOTH_ADDR_TIMEOUT * 1000);
          }
      }
  #endif
  
      add_dns_addr(&netif);
  
      return NSAPI_ERROR_OK;
  }
  
  nsapi_error_t LWIP::Interface::bringdown()
  {
      // Check if we've connected
      if (connected == NSAPI_STATUS_DISCONNECTED) {
          return NSAPI_ERROR_NO_CONNECTION;
      }
  
  #if LWIP_DHCP
      // Disconnect from the network
      if (dhcp_started) {
          dhcp_release(&netif);
          dhcp_stop(&netif);
          dhcp_started = false;
          dhcp_has_to_be_set = false;
      }
  #endif
  
      if (ppp) {
          /* this is a blocking call, returns when PPP is properly closed */
          err_t err = ppp_lwip_disconnect(hw);
          if (err) {
              return err_remap(err);
          }
          MBED_ASSERT(!netif_is_link_up(&netif));
          /*if (netif_is_link_up(&netif)) {
              if (sys_arch_sem_wait(&unlinked, 15000) == SYS_ARCH_TIMEOUT) {
                  return NSAPI_ERROR_DEVICE_ERROR;
              }
          }*/
      } else {
          netif_set_down(&netif);
      }
  
  #if LWIP_IPV6
      mbed_lwip_clear_ipv6_addresses(&netif);
  #endif
  #if LWIP_IPV4
      ip_addr_set_zero(&(netif.ip_addr));
      ip_addr_set_zero(&(netif.netmask));
      ip_addr_set_zero(&(netif.gw));
  #endif
  
      osSemaphoreDelete(has_any_addr);
      osSemaphoreAttr_t attr;
      attr.name = NULL;
      attr.attr_bits = 0;
      attr.cb_mem = &has_any_addr_sem;
      attr.cb_size = sizeof has_any_addr_sem;
      has_any_addr = osSemaphoreNew(UINT16_MAX, 0, &attr);
  #if PREF_ADDR_TIMEOUT
      osSemaphoreDelete(has_pref_addr);
      attr.cb_mem = &has_pref_addr_sem;
      attr.cb_size = sizeof has_pref_addr_sem;
      has_pref_addr = osSemaphoreNew(UINT16_MAX, 0, &attr);
  #endif
  #if BOTH_ADDR_TIMEOUT
      osSemaphoreDelete(has_both_addr);
      attr.cb_mem = &has_both_addr_sem;
      attr.cb_size = sizeof has_both_addr_sem;
      has_both_addr = osSemaphoreNew(UINT16_MAX, 0, &attr);
  #endif
      has_addr_state = 0;
  
      connected = NSAPI_STATUS_DISCONNECTED;
      if (client_callback) {
          client_callback(NSAPI_EVENT_CONNECTION_STATUS_CHANGE, connected);
      }
      return 0;
  }
  