ISM43362Interface.cpp

/* ISM43362 implementation of NetworkInterfaceAPI
 * Copyright (c) STMicroelectronics 2018
 *
 * 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.
 */

#include <string.h>
#include <inttypes.h>
#include "ISM43362Interface.h"
#include "mbed_debug.h"

#if MBED_CONF_ISM43362_READ_THREAD_STACK_SIZE != 0
#if MBED_CONF_ISM43362_READ_THREAD_STACK_STATICALLY_ALLOCATED == 1
static uint8_t ism_wifi_thread_stack[MBED_CONF_ISM43362_READ_THREAD_STACK_SIZE];
#else
static uint8_t *ism_wifi_thread_stack = NULL;
#endif // MBED_CONF_ISM43362_READ_THREAD_STACK_STATICALLY_ALLOCATED == 1
#endif // MBED_CONF_ISM43362_READ_THREAD_STACK_SIZE != 0

// Product ID,FW Revision,API Revision,Stack Revision,RTOS Revision,CPU Clock,Product Name
#define LATEST_FW_VERSION_NUMBER "C3.5.2.5" // ISM43362-M3G-L44-SPI,C3.5.2.5.STM,v3.5.2,v1.4.0.rc1,v8.2.1,120000000,Inventek eS-WiFi

// Set 1 to force debug information
#define ism_interface_debug 0

#define MIN(a,b) (((a)<(b))?(a):(b))

#define ISM43362_WIFI_IF_NAME "is0"

// ISM43362Interface implementation
ISM43362Interface::ISM43362Interface(bool debug)
    : _ism(MBED_CONF_ISM43362_WIFI_MOSI, MBED_CONF_ISM43362_WIFI_MISO, MBED_CONF_ISM43362_WIFI_SCLK, MBED_CONF_ISM43362_WIFI_NSS, MBED_CONF_ISM43362_WIFI_RESET, MBED_CONF_ISM43362_WIFI_DATAREADY, MBED_CONF_ISM43362_WIFI_WAKEUP, debug),
#if MBED_CONF_ISM43362_READ_THREAD_STACK_SIZE != 0
      thread_read_socket(osPriorityNormal, MBED_CONF_ISM43362_READ_THREAD_STACK_SIZE, ism_wifi_thread_stack, "ism43362"),
#endif
      _conn_stat(NSAPI_STATUS_DISCONNECTED),
      _conn_stat_cb(NULL)
{
    _ism_debug = ism_interface_debug || debug;
    memset(_ids, 0, sizeof(_ids));
    memset(_socket_obj, 0, sizeof(_socket_obj));
    _ism.attach(this, &ISM43362Interface::update_conn_state_cb);
    memset(_cbs, 0, sizeof(_cbs));
    memset(ap_ssid, 0, sizeof(ap_ssid));
    memset(ap_pass, 0, sizeof(ap_pass));
    ap_sec = ISM_SECURITY_UNKNOWN;

    thread_read_socket.start(callback(this, &ISM43362Interface::socket_check_read));

    _mutex.lock();

    // Check all supported firmware versions
    _FwVersion = _ism.get_firmware_version();

    if (!_FwVersion) {
        error("ISM43362Interface: ERROR cannot read firmware version\r\n");
    }

    debug_if(_ism_debug, "ISM43362Interface: read_version = %" PRIu32 "\r\n", _FwVersion);
    /* FW Revision should be with format "CX.X.X.X" with X as a single digit */
    if ((_FwVersion < 1000) || (_FwVersion > 9999)) {
        debug_if(_ism_debug, "ISM43362Interface: read_version issue\r\n");
    }

#if !TARGET_DISCO_F413ZH
    if ((int32_t)_FwVersion < ParseNumber((char *)LATEST_FW_VERSION_NUMBER, NULL)) {
        debug_if(_ism_debug, "ISM43362Interface: please update FW\r\n");
    }
#endif

    _connect_status = NSAPI_ERROR_NO_CONNECTION;
    _mutex.unlock();
}

nsapi_error_t ISM43362Interface::connect(const char *ssid, const char *pass, nsapi_security_t security,
                                         uint8_t channel)
{
    if (channel != 0) {
        return NSAPI_ERROR_UNSUPPORTED;
    }

    nsapi_error_t credentials_status = set_credentials(ssid, pass, security);
    if (credentials_status) {
        return credentials_status;
    }

    return connect();
}

nsapi_error_t ISM43362Interface::connect()
{
    if (strlen(ap_ssid) == 0) {
        return NSAPI_ERROR_NO_SSID;
    }

    _mutex.lock();

    if (!_ism.dhcp(true)) {
        _mutex.unlock();
        return NSAPI_ERROR_DHCP_FAILURE;
    }

    _connect_status = _ism.connect(ap_ssid, ap_pass, ap_sec);
    debug_if(_ism_debug, "ISM43362Interface: connect_status %d\n", _connect_status);

    if (_connect_status != NSAPI_ERROR_OK) {
        _mutex.unlock();
        return _connect_status;
    }

    if (!_ism.getIPAddress()) {
        _connect_status = NSAPI_ERROR_DHCP_FAILURE;
        _mutex.unlock();
        return NSAPI_ERROR_DHCP_FAILURE;
    }

    _mutex.unlock();

    return NSAPI_ERROR_OK;
}


int ISM43362Interface::set_credentials(const char *ssid, const char *pass, nsapi_security_t security)
{
    if ((ssid == NULL) || (strlen(ssid) == 0) || (strlen(ssid) > 32)) {
        return NSAPI_ERROR_PARAMETER;
    }

    if (security != NSAPI_SECURITY_NONE) {
        if ((pass == NULL) || (strcmp(pass, "") == 0)) {
            return NSAPI_ERROR_PARAMETER;
        }
    }

    if (strlen(pass) > 63) {
        return NSAPI_ERROR_PARAMETER;
    }

    _mutex.lock();
    memset(ap_ssid, 0, sizeof(ap_ssid));
    strncpy(ap_ssid, ssid, sizeof(ap_ssid));

    memset(ap_pass, 0, sizeof(ap_pass));
    strncpy(ap_pass, pass, sizeof(ap_pass));

    switch (security) {
        case NSAPI_SECURITY_NONE:
            ap_sec = ISM_SECURITY_NONE;
            break;
        case NSAPI_SECURITY_WEP:
            ap_sec = ISM_SECURITY_WEP;
            break;
        case NSAPI_SECURITY_WPA:
            ap_sec = ISM_SECURITY_WPA;
            break;
        case NSAPI_SECURITY_WPA2:
            ap_sec = ISM_SECURITY_WPA2;
            break;
        case NSAPI_SECURITY_WPA_WPA2:
            ap_sec = ISM_SECURITY_WPA_WPA2;
            break;
        default:
            ap_sec = ISM_SECURITY_UNKNOWN;
            break;
    }
    _mutex.unlock();

    return NSAPI_ERROR_OK;
}

int ISM43362Interface::set_channel(uint8_t channel)
{
    return NSAPI_ERROR_UNSUPPORTED;
}

nsapi_error_t ISM43362Interface::disconnect()
{
    _mutex.lock();

    if (_connect_status != NSAPI_ERROR_OK) {
        _mutex.unlock();
        return NSAPI_ERROR_NO_CONNECTION;
    }

    if (!_ism.disconnect()) {
        _mutex.unlock();
        return NSAPI_ERROR_DEVICE_ERROR;
    }

    _connect_status = NSAPI_ERROR_NO_CONNECTION;
    _mutex.unlock();
    return NSAPI_ERROR_OK;
}

const char *ISM43362Interface::get_ip_address()
{
    _mutex.lock();
    const char *ret = _ism.getIPAddress();
    _mutex.unlock();
    return ret;
}

nsapi_error_t ISM43362Interface::get_ip_address(SocketAddress *address)
{
    if (!address) {
        return NSAPI_ERROR_PARAMETER;
    }
    _mutex.lock();
    if (address->set_ip_address(_ism.getIPAddress())) {
        _mutex.unlock();
        return NSAPI_ERROR_OK;
    }
    _mutex.unlock();
    return NSAPI_ERROR_NO_ADDRESS;
}

const char *ISM43362Interface::get_mac_address()
{
    _mutex.lock();
    const char *ret = _ism.getMACAddress();
    _mutex.unlock();
    return ret;
}

const char *ISM43362Interface::get_gateway()
{
    _mutex.lock();
    const char *ret = _ism.getGateway();
    _mutex.unlock();
    return ret;
}

nsapi_error_t ISM43362Interface::get_gateway(SocketAddress *address)
{
    if (!address) {
        return NSAPI_ERROR_PARAMETER;
    }
    _mutex.lock();
    if (address->set_ip_address(_ism.getGateway())) {
        _mutex.unlock();
        return NSAPI_ERROR_OK;
    }
    _mutex.unlock();
    return NSAPI_ERROR_NO_ADDRESS;
}

const char *ISM43362Interface::get_netmask()
{
    _mutex.lock();
    const char *ret = _ism.getNetmask();
    _mutex.unlock();
    return ret;
}

nsapi_error_t ISM43362Interface::get_netmask(SocketAddress *address)
{
    if (!address) {
        return NSAPI_ERROR_PARAMETER;
    }
    _mutex.lock();
    if (address->set_ip_address(_ism.getNetmask())) {
        _mutex.unlock();
        return NSAPI_ERROR_OK;
    }
    _mutex.unlock();
    return NSAPI_ERROR_NO_ADDRESS;
}

char *ISM43362Interface::get_interface_name(char *interface_name)
{
    memcpy(interface_name, ISM43362_WIFI_IF_NAME, sizeof(ISM43362_WIFI_IF_NAME));
    return interface_name;
}

int8_t ISM43362Interface::get_rssi()
{
    _mutex.lock();
    int8_t ret = _ism.getRSSI();
    _mutex.unlock();
    return ret;
}

int ISM43362Interface::scan(WiFiAccessPoint *res, unsigned count)
{
    _mutex.lock();
    int ret = _ism.scan(res, count);
    _mutex.unlock();
    return ret;
}

struct ISM43362_socket {
    int id;
    nsapi_protocol_t proto;
    volatile bool connected;
    char read_data[1400];
    volatile uint32_t read_data_size;
};

int ISM43362Interface::socket_open(void **handle, nsapi_protocol_t proto)
{
    int ret = NSAPI_ERROR_OK;
    struct ISM43362_socket *socket;
    _mutex.lock();

    // Look for an unused socket
    int id = -1;
    for (int i = 0; i < ISM43362_SOCKET_COUNT; i++) {
        if (!_ids[i]) {
            id = i;
            _ids[i] = true;
            break;
        }
    }

    if (id == -1) {
        debug_if(_ism_debug, "ISM43362Interface: socket_open: no empty slot\n");
        ret = NSAPI_ERROR_NO_SOCKET;
        goto exit;
    }
    socket = new struct ISM43362_socket;
    if (!socket) {
        debug_if(_ism_debug, "ISM43362Interface: socket_open: create socket failed\n");
        ret = NSAPI_ERROR_NO_SOCKET;
        goto exit;
    }
    socket->id = id;

    debug_if(_ism_debug, "ISM43362Interface: socket_open id=%d proto=%d\n", socket->id, proto);
    memset(socket->read_data, 0, sizeof(socket->read_data));
    socket->read_data_size = 0;
    socket->proto = proto;
    socket->connected = false;
    *handle = socket;

    ret = _ism.open(socket->id, (socket->proto == NSAPI_UDP) ? "1" : "0");

exit:
    _mutex.unlock();
    return ret;
}

int ISM43362Interface::socket_close(void *handle)
{
    _mutex.lock();
    struct ISM43362_socket *socket = (struct ISM43362_socket *)handle;
    debug_if(_ism_debug, "ISM43362Interface: socket_close, id=%d\n", socket->id);
    int err = 0;

    if (!_ism.close(socket->id)) {
        err = NSAPI_ERROR_DEVICE_ERROR;
    }

    socket->connected = false;
    _ids[socket->id] = false;
    _socket_obj[socket->id] = 0;
    delete socket;
    _mutex.unlock();
    return err;
}

int ISM43362Interface::socket_bind(void *handle, const SocketAddress &address)
{
    int ret = NSAPI_ERROR_OK;
    struct ISM43362_socket *socket;

    _mutex.lock();
    socket = (struct ISM43362_socket *)handle;
    debug_if(_ism_debug, "ISM43362Interface: socket_bind, id=%d address=%s port=%d\n", socket->id, address.get_ip_address(), address.get_port());
    ret = _ism.bind(socket->id, address.get_ip_address(), address.get_port());
    if (ret != NSAPI_ERROR_OK)
    {
        debug_if(_ism_debug, "ISM43362Interface: socket_bind: bind failed\n");
        goto exit;
    }

    if (socket->proto == NSAPI_UDP)
    {
        ret = _ism.startServer(socket->id);
        if (ret != NSAPI_ERROR_OK)
        {
            debug_if(_ism_debug, "ISM43362Interface: socket_bind: start UDP server failed\n");
            goto exit;
        }
        _socket_obj[socket->id] = (uint32_t)socket;
    }

exit:
    _mutex.unlock();
    return ret;
}

int ISM43362Interface::socket_listen(void *handle, int backlog)
{
    int ret = NSAPI_ERROR_OK;
    struct ISM43362_socket *socket;

    _mutex.lock();
    socket = (struct ISM43362_socket *)handle;
    debug_if(_ism_debug, "ISM43362Interface: socket_listen, id=%d backlog=%d\n", socket->id, backlog);
    ret = _ism.setServerParam(socket->id, backlog);
    if (ret != NSAPI_ERROR_OK)
    {
        debug_if(_ism_debug, "ISM43362Interface: socket_bind: start UDP server failed\n");
        goto exit;
    }

    ret = _ism.startServer(socket->id);
    if (ret != NSAPI_ERROR_OK)
    {
        debug_if(_ism_debug, "ISM43362Interface: socket_listen: start TCP server failed\n");
        goto exit;
    }

    _socket_obj[socket->id] = (uint32_t)socket;

exit:
    _mutex.unlock();
    return ret;
}

int ISM43362Interface::socket_connect_nolock(void *handle, const SocketAddress &addr)
{
    struct ISM43362_socket *socket = (struct ISM43362_socket *)handle;
    return _ism.setClientParam(socket->id, addr.get_ip_address(), addr.get_port());;
}

int ISM43362Interface::socket_connect(void *handle, const SocketAddress &addr)
{
    int ret = NSAPI_ERROR_OK;
    struct ISM43362_socket *socket;

    _mutex.lock();
    socket = (struct ISM43362_socket *)handle;
    debug_if(_ism_debug, "ISM43362Interface: socket_connect, id=%d ip=%s port=%d\n", socket->id, addr.get_ip_address(), addr.get_port());
    ret = socket_connect_nolock(handle, addr);
    if (ret != NSAPI_ERROR_OK)
    {
        debug_if(_ism_debug, "ISM43362Interface: socket_connect: connect failed\n");
        goto exit;
    }

    ret = _ism.startClient(socket->id);
    if (ret != NSAPI_ERROR_OK)
    {
        debug_if(_ism_debug, "ISM43362Interface: socket_connect: start client failed\n");
        goto exit;
    }

    socket->connected = true;
    _socket_obj[socket->id] = (uint32_t)socket;

exit:
    _mutex.unlock();
    return ret;
}

void ISM43362Interface::socket_check_read()
{
    while (1) {
        if (_connect_status == NSAPI_ERROR_OK)
        {
            for (int i = 0; i < ISM43362_SOCKET_COUNT; i++) {
                _mutex.lock();
                if (_socket_obj[i] != 0) {
                    struct ISM43362_socket *socket = (struct ISM43362_socket *)_socket_obj[i];
                    /* Check if there is something to read for this socket. But if it */
                    /* has already been read : don't read again */
                    if ((socket->read_data_size == 0) && _cbs[socket->id].callback) {
                        /* if no callback is set, no need to read ?*/
                        // debug_if(_ism_debug, "ISM43362Interface socket_check_read: i %d\r\n", i);
                        int read_amount = _ism.check_recv_status(socket->id, socket->read_data);
                        if (read_amount > 0) {
                            socket->read_data_size = read_amount;
                            debug_if(_ism_debug, "ISM43362Interface socket_check_read read_amount %d\r\n", read_amount);
                        } else if (read_amount < 0) {
                            /* Mark donw connection has been lost or closed */
                            debug_if(_ism_debug, "ISM43362Interface socket_check_read: i %d closed\r\n", i);
                            socket->connected = false;
                        }
                        if (read_amount != 0) {
                            /* There is something to read in this socket*/
                            if (_cbs[socket->id].callback) {
                                _cbs[socket->id].callback(_cbs[socket->id].data);
                            }
                        }
                    }
                }
                _mutex.unlock();
            }
        }
        rtos::ThisThread::sleep_for(50);
    }
}

int ISM43362Interface::socket_accept(void *server, void **socket, SocketAddress *addr)
{
    int ret = NSAPI_ERROR_OK;
    char tmp[16];
    uint16_t port;

    _mutex.lock();

    if (server == nullptr || socket == nullptr || addr == nullptr)
    {
        debug_if(_ism_debug, "ISM43362Interface socket_accept: wrong arguments\r\n");
        _mutex.unlock();
        return NSAPI_ERROR_PARAMETER;
    }

    struct ISM43362_socket *serverSocket = (struct ISM43362_socket *)server;

    ret = _ism.getClientDetails(serverSocket->id, tmp, sizeof(tmp), &port);
    if (ret != NSAPI_ERROR_OK)
    {
        debug_if(_ism_debug, "ISM43362Interface socket_accept: get client details failed\r\n");
        _mutex.unlock();
        return ret;
    }
    SocketAddress clientAddr(tmp, port);
    *addr = clientAddr;

    serverSocket->connected = true;

    /* Reset read buffer */
    memset(serverSocket->read_data, 0, sizeof(serverSocket->read_data));
    serverSocket->read_data_size = 0;

    *socket = server;

exit:
    _mutex.unlock();
    return ret;
}

int ISM43362Interface::socket_send_nolock(void *handle, const void *data, unsigned size)
{
    struct ISM43362_socket *socket = (struct ISM43362_socket *)handle;

    debug_if(_ism_debug, "ISM43362Interface socket_send_nolock id %d size %u\r\n", socket->id, size);

    if (size > ES_WIFI_MAX_TX_PACKET_SIZE) {
        size = ES_WIFI_MAX_TX_PACKET_SIZE;
    }

    if (!_ism.send(socket->id, data, size)) {
        debug_if(_ism_debug, "ISM43362Interface: socket_send_nolock ERROR\r\n");
        return NSAPI_ERROR_DEVICE_ERROR;
    }

    return size;
}

int ISM43362Interface::socket_send(void *handle, const void *data, unsigned size)
{
    int ret = 0;
    _mutex.lock();
    struct ISM43362_socket *socket = (struct ISM43362_socket *)handle;
    if (!socket->connected) {
        _mutex.unlock();
        return NSAPI_ERROR_NO_CONNECTION;
    }
    ret = socket_send_nolock(handle, data, size);
    _mutex.unlock();
    return ret;
}

int ISM43362Interface::socket_recv(void *handle, void *data, unsigned size)
{
    _mutex.lock();
    unsigned recv = 0;
    struct ISM43362_socket *socket = (struct ISM43362_socket *)handle;
    char *ptr = (char *)data;

    if (!socket->connected) {
        _mutex.unlock();
        return 0;
    }

    if (socket->read_data_size == 0) {
        /* if no callback is set, no need to read ?*/
        int read_amount = _ism.check_recv_status(socket->id, socket->read_data);
        if (read_amount > 0) {
            socket->read_data_size = read_amount;
        } else if (read_amount < 0) {
            socket->connected = false;
            debug_if(_ism_debug, "ISM43362Interface socket_recv: socket closed\r\n");
            _mutex.unlock();
            return 0;
        }
    }

    if (socket->read_data_size != 0) {
        // debug_if(_ism_debug, "ISM43362Interface socket_recv: read_data_size=%d\r\n", socket->read_data_size);
        uint32_t i = 0;
        while ((i < socket->read_data_size) && (i < size)) {
            *ptr++ = socket->read_data[i];
            i++;
        }

        recv += i;

        if (i >= socket->read_data_size) {
            /* All the storeed data has been read, reset buffer */
            memset(socket->read_data, 0, sizeof(socket->read_data));
            socket->read_data_size = 0;
            // debug_if(_ism_debug, "ISM43362Interface: Socket_recv buffer reset\r\n");
        } else {
            /*  In case there is remaining data in buffer, update socket content
             *  For now by shift copy of all data (not very efficient to be
             *  revised */
            while (i < socket->read_data_size) {
                socket->read_data[i - size] = socket->read_data[i];
                i++;
            }

            socket->read_data_size -= size;
        }
    }
    // else {
    //     debug_if(_ism_debug, "ISM43362Interface socket_recv: Nothing in buffer\r\n");
    // }

    _mutex.unlock();

    if (recv > 0) {
        debug_if(_ism_debug, "ISM43362Interface socket_recv: recv=%d\r\n", recv);
        return recv;
    } else {
        // debug_if(_ism_debug, "ISM43362Interface socket_recv: returns WOULD BLOCK\r\n");
        return NSAPI_ERROR_WOULD_BLOCK;
    }
}

int ISM43362Interface::socket_sendto(void *handle, const SocketAddress &addr, const void *data, unsigned size)
{
    int ret;
    _mutex.lock();
    struct ISM43362_socket *socket = (struct ISM43362_socket *)handle;

    if (socket->proto == NSAPI_UDP && !socket->connected)
    {
        ret = socket_connect_nolock(handle, addr);
        if (ret != NSAPI_ERROR_OK)
        {
            _mutex.unlock();
            return ret;
        }

        ret = _ism.startClient(socket->id);
        if (ret != NSAPI_ERROR_OK)
        {
            _mutex.unlock();
            return ret;
        }
        socket->connected = true;
        _socket_obj[socket->id] = (uint32_t)socket;
    }
    else
    {
        if (!socket->connected)
        {
            _mutex.unlock();
            return NSAPI_ERROR_NO_CONNECTION;
        }
    }

    ret = socket_send_nolock(socket, data, size);
    _mutex.unlock();

    return ret;
}

int ISM43362Interface::socket_recvfrom(void *handle, SocketAddress *addr, void *data, unsigned size)
{
    int ret = 0;
    _mutex.lock();
    struct ISM43362_socket *socket = (struct ISM43362_socket *)handle;
    char *ptr = (char *)data;
    char tmp[16];
    uint16_t port;

    if (addr == nullptr || data == nullptr)
    {
        debug_if(_ism_debug, "ISM43362Interface socket_recvfrom: wrong arguments\r\n");
        _mutex.unlock();
        return NSAPI_ERROR_PARAMETER;
    }

    ret = _ism.getClientDetails(socket->id, tmp, sizeof(tmp), &port);
    if (ret != NSAPI_ERROR_OK)
    {
        debug_if(_ism_debug, "ISM43362Interface socket_recvfrom: get client details failed\r\n");
        _mutex.unlock();
        return ret;
    }
    SocketAddress clientAddr(tmp, port);

    *addr = clientAddr;

    if (socket->read_data_size == 0) {
        int read_amount = _ism.check_recv_status(socket->id, socket->read_data);
        if (read_amount > 0) {
            socket->read_data_size = read_amount;
        } else if (read_amount < 0) {
            debug_if(_ism_debug, "ISM43362Interface socket_recvfrom: data received failed\r\n");
            ret = NSAPI_ERROR_DEVICE_ERROR;
        }
    }

    if (socket->read_data_size > 0) {
        uint32_t i = 0;
        while ((i < socket->read_data_size) && (i < size)) {
            *ptr++ = socket->read_data[i];
            i++;
        }

        ret = i;

        if (i >= socket->read_data_size) {
            /* All the storeed data has been read, reset buffer */
            memset(socket->read_data, 0, sizeof(socket->read_data));
            socket->read_data_size = 0;
        } else {
            /*  In case there is remaining data in buffer, update socket content
             *  For now by shift copy of all data (not very efficient to be
             *  revised */
            while (i < socket->read_data_size) {
                socket->read_data[i - size] = socket->read_data[i];
                i++;
            }

            socket->read_data_size -= size;
        }
    }

    _mutex.unlock();
    return ret;
}

void ISM43362Interface::socket_attach(void *handle, void (*cb)(void *), void *data)
{
    _mutex.lock();
    struct ISM43362_socket *socket = (struct ISM43362_socket *)handle;
    debug_if(_ism_debug, "ISM43362Interface: socket_attach id %d\n", socket->id);
    _cbs[socket->id].callback = cb;
    _cbs[socket->id].data = data;
    _mutex.unlock();
}

void ISM43362Interface::event()
{
     _mutex.lock();
    debug_if(_ism_debug, "ISM43362Interface: event\n");
    for (int i = 0; i < ISM43362_SOCKET_COUNT; i++) {
        if (_cbs[i].callback) {
            _cbs[i].callback(_cbs[i].data);
        }
    }
    _mutex.unlock();
}

void ISM43362Interface::attach(Callback<void(nsapi_event_t, intptr_t)> status_cb)
{
    _mutex.lock();
    debug_if(_ism_debug, "ISM43362Interface: attach\n");
    _conn_stat_cb = status_cb;
    _mutex.unlock();
}

nsapi_connection_status_t ISM43362Interface::get_connection_status() const
{
    debug_if(_ism_debug, "ISM43362Interface: get_connection_status %d\n", _conn_stat);
    return _conn_stat;
}


void ISM43362Interface::update_conn_state_cb()
{
    _mutex.lock();
    nsapi_connection_status_t prev_stat = _conn_stat;
    _conn_stat = _ism.connection_status();
    debug_if(_ism_debug, "ISM43362Interface: update_conn_state_cb %d -> %d\n", prev_stat, _conn_stat);

    if (prev_stat == _conn_stat) {
        _mutex.unlock();
        return;
    }

    // Inform upper layers
    if (_conn_stat_cb) {
        _conn_stat_cb(NSAPI_EVENT_CONNECTION_STATUS_CHANGE, _conn_stat);
    }
    _mutex.unlock();
}


#if MBED_CONF_ISM43362_PROVIDE_DEFAULT

WiFiInterface *WiFiInterface::get_default_instance()
{
    static ISM43362Interface ism;
    return &ism;
}

#endif