squeezelite-esp32/components/wifi-manager/network_manager.c

/*
Copyright (c) 2017-2021 Sebastien L
*/

#ifdef NETWORK_MANAGER_LOG_LEVEL
#define LOG_LOCAL_LEVEL NETWORK_MANAGER_LOG_LEVEL
#endif
#include "network_manager.h"
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "network_ethernet.h"
#include "network_status.h"
#include "network_wifi.h"

#include "dns_server.h"
#include "esp_log.h"
#include "esp_system.h"
#include "freertos/FreeRTOS.h"
#include "platform_esp32.h"

#include "esp_netif.h"
#include "freertos/task.h"

#include "cJSON.h"
#include "cmd_system.h"
#include "esp_app_format.h"

#include "esp_event.h"
#include "esp_ota_ops.h"
#include "esp_wifi.h"
#include "esp_wifi_types.h"
#include "lwip/api.h"
#include "lwip/err.h"
#include "lwip/ip4_addr.h"
#include "lwip/netdb.h"
#include "mdns.h"
#include "messaging.h"

#include "platform_config.h"
#include "tools.h"
#include "trace.h"

#include "accessors.h"
#include "esp_err.h"
#include "http_server_handlers.h"
#include "network_manager.h"

QueueHandle_t network_queue;
BaseType_t network_task_handle;
static const char TAG[] = "network";
static TaskHandle_t task_network_manager = NULL;
RTC_NOINIT_ATTR static bool s_wifi_prioritized;

extern esp_reset_reason_t xReason;
typedef struct network_callback {
    network_status_reached_cb cb;
    nm_state_t state;
    int sub_state;
    const char* from;
    SLIST_ENTRY(network_callback)
    next;  //!< next callback
} network_callback_t;
static wifi_connect_state_t wifi_connect_state = NETWORK_WIFI_STATE_INIT;
/** linked list of command structures */
static SLIST_HEAD(cb_list, network_callback) s_cb_list;
network_t NM;

//! Create and initialize the array of state machines.
state_machine_t* const SM[] = {(state_machine_t*)&NM};
static void network_timer_cb(void* timer_id);
int get_root_id(const state_t *  state);
const state_t* get_root( const state_t* const state);
static void network_task(void* pvParameters);
void network_wifi_set_connect_state(wifi_connect_state_t state){
    wifi_connect_state = state;
}
wifi_connect_state_t network_wifi_get_connect_state(){
    return wifi_connect_state;
}
void network_start_stop_dhcp_client(esp_netif_t* netif, bool start) {
    tcpip_adapter_dhcp_status_t status;
    esp_err_t err = ESP_OK;
    ESP_LOGD(TAG, "Checking if DHCP client for STA interface is running");
    if (!netif) {
        ESP_LOGE(TAG, "Invalid adapter. Cannot start/stop dhcp. ");
        return;
    }
    if((err=esp_netif_dhcpc_get_status(netif, &status))!=ESP_OK){
         ESP_LOGE(TAG,"Error retrieving dhcp status : %s", esp_err_to_name(err));
         return;
    }
     switch (status)
    {
        case ESP_NETIF_DHCP_STARTED:
        if(start){
            ESP_LOGD(TAG, "DHCP client already started");
        }
        else {
            ESP_LOGI(TAG, "Stopping DHCP client");
            err = esp_netif_dhcpc_stop(netif);
            if(err!=ESP_OK){
                ESP_LOGE(TAG,"Error stopping DHCP Client : %s",esp_err_to_name(err));
            }
        }
        break;
        case ESP_NETIF_DHCP_STOPPED:
        if(start){
            ESP_LOGI(TAG, "Starting DHCP client");
            err = esp_netif_dhcpc_start(netif);
            if(err!=ESP_OK){
                ESP_LOGE(TAG,"Error stopping DHCP Client : %s",esp_err_to_name(err));
            }
        }
        else {
            ESP_LOGI(TAG, "DHCP client already started");
        }
        break;
        case ESP_NETIF_DHCP_INIT:
        if(start){
            ESP_LOGI(TAG, "Starting DHCP client");
            err = esp_netif_dhcpc_start(netif);
            if(err!=ESP_OK){
                ESP_LOGE(TAG,"Error stopping DHCP Client : %s",esp_err_to_name(err));
            }
        }
        else {
            ESP_LOGI(TAG, "Stopping DHCP client");
            err = esp_netif_dhcpc_stop(netif);
            if(err!=ESP_OK){
                ESP_LOGE(TAG,"Error stopping DHCP Client : %s",esp_err_to_name(err));
            }
        }
        break;

        default:
            ESP_LOGW(TAG,"Unknown DHCP status");
            break;
    }
}
void network_start_stop_dhcps(esp_netif_t* netif, bool start) {
    tcpip_adapter_dhcp_status_t status;
    esp_err_t err = ESP_OK;
    ESP_LOGD(TAG, "Checking if DHCP server is running");
    if (!netif) {
        ESP_LOGE(TAG, "Invalid adapter. Cannot start/stop dhcp server. ");
        return;
    }
    if((err=esp_netif_dhcps_get_status(netif, &status))!=ESP_OK){
         ESP_LOGE(TAG,"Error retrieving dhcp server status : %s", esp_err_to_name(err));
         return;
    }
     switch (status)
    {
        case ESP_NETIF_DHCP_STARTED:
        if(start){
            ESP_LOGD(TAG, "DHCP server already started");
        }
        else {
            ESP_LOGI(TAG, "Stopping DHCP server");
            ESP_ERROR_CHECK_WITHOUT_ABORT(esp_netif_dhcps_stop(netif));
        }
        break;
        case ESP_NETIF_DHCP_STOPPED:
        if(start){
            ESP_LOGI(TAG, "Starting DHCP server");
            ESP_ERROR_CHECK_WITHOUT_ABORT(esp_netif_dhcps_start(netif));
        }
        else {
            ESP_LOGI(TAG, "DHCP server already stopped");
        }
        break;
        case ESP_NETIF_DHCP_INIT:
        if(start){
            ESP_LOGI(TAG, "Starting DHCP server");
            ESP_ERROR_CHECK_WITHOUT_ABORT(esp_netif_dhcps_start(netif));
        }
        else {
            ESP_LOGI(TAG, "Stopping DHCP server");
            ESP_ERROR_CHECK_WITHOUT_ABORT(esp_netif_dhcps_stop(netif));
        }
        break;

        default:
            ESP_LOGW(TAG,"Unknown DHCP status");
            break;
    }
}
/********************************************************************************************* 
 * String conversion routines
 */



#define ADD_ROOT(name,...)    CASE_TO_STR(name);
#define ADD_ROOT_LEAF(name,...) CASE_TO_STR(name);
#define ADD_LEAF(name,...) CASE_TO_STR(name);
#define ADD_EVENT(name) CASE_TO_STR(name);
#define ADD_FIRST_EVENT(name) CASE_TO_STR(name);
static const char* nm_state_to_string(nm_state_t  state) {
    switch (state) {
        ALL_NM_STATE
        default:
            break;
    }
    return "Unknown";
}
static const char* state_to_string(const  state_t * state) {
    if(!state) {
        return "";
    }
    return nm_state_to_string(state->Parent?state->Parent->Id:state->Id);
   
}
static const char* wifi_state_to_string(mn_wifi_active_state_t state) {
    switch (state) {
        ALL_WIFI_STATE(,)
        default:
            break;
    }
    return "Unknown";
}
static const char* eth_state_to_string(mn_eth_active_state_t state) {
    switch (state) {
        ALL_ETH_STATE(,)
        default:
            break;
    }
    return "Unknown";
}
static const char* wifi_configuring_state_to_string(mn_wifi_configuring_state_t state) {
    switch (state) {
        ALL_WIFI_CONFIGURING_STATE(,)
        default:
            break;
    }
    return "Unknown";
}
static const char* sub_state_id_to_string(nm_state_t state, int substate) {
    switch (state)
    {
    case NETWORK_ETH_ACTIVE_STATE:
        return eth_state_to_string(substate);
        break;
    case NETWORK_WIFI_ACTIVE_STATE:
        return wifi_state_to_string(substate);
    case NETWORK_WIFI_CONFIGURING_ACTIVE_STATE:
        return wifi_configuring_state_to_string(substate);
    default:
        break;
    }
    return "*";
}
static const char* sub_state_to_string(const state_t * state) {
    if(!state) {
        return "N/A";
    }
    return sub_state_id_to_string(get_root_id(state), state->Id);
}

static const char* event_to_string(network_event_t state) {
    switch (state) {
        ALL_NM_EVENTS

        default:
            break;
    }
    return "Unknown";
}

#undef ADD_EVENT
#undef ADD_FIRST_EVENT
#undef ADD_ROOT
#undef ADD_ROOT_LEAF
#undef ADD_LEAF

typedef struct  { 
    int parent_state; 
    int sub_state_last ;
} max_sub_states_t;
static const max_sub_states_t state_max[] = {
{ .parent_state = NETWORK_INSTANTIATED_STATE, .sub_state_last = 0 },
{.parent_state = NETWORK_ETH_ACTIVE_STATE, .sub_state_last = TOTAL_ETH_ACTIVE_STATE-1 },
{.parent_state = NETWORK_WIFI_ACTIVE_STATE, .sub_state_last = TOTAL_WIFI_ACTIVE_STATE-1 },
{.parent_state = NETWORK_WIFI_CONFIGURING_ACTIVE_STATE, .sub_state_last = TOTAL_WIFI_CONFIGURING_STATE-1 },
{.parent_state =-1}
};



void network_start() {
    
    if(cold_boot){
        ESP_LOGI(TAG, "Setting wifi priotitized flag to false");
        s_wifi_prioritized = false;
    }
    ESP_LOGD(TAG, " Creating message queue");
    network_queue = xQueueCreate(3, sizeof(queue_message));
    ESP_LOGD(TAG, " Creating network manager task");
    network_task_handle = xTaskCreate(&network_task, "network", 4096, NULL, WIFI_MANAGER_TASK_PRIORITY, &task_network_manager);
}

static void event_logger(uint32_t state_machine, uint32_t state, uint32_t event) {
    ESP_LOGD(TAG, "Handling network manager event state Id %d->[%s]", state, event_to_string(event));
}
static const char * get_state_machine_result_string(state_machine_result_t result) {
    switch(result) {
        case EVENT_HANDLED:
            return "EVENT_HANDLED"; 
        case EVENT_UN_HANDLED:  
            return "EVENT_UN_HANDLED";
        case TRIGGERED_TO_SELF:
            return "TRIGGERED_TO_SELF";
    }
    return "Unknown";
}
static void result_logger(uint32_t state, state_machine_result_t result) {
    ESP_LOGD(TAG, "Network Manager Result: %s, New State id: %d", get_state_machine_result_string(result) , state);
}

static void network_task(void* pvParameters) {
    queue_message msg;
    BaseType_t xStatus;
    initialize_network_handlers((state_machine_t*)&NM);
    network_async(EN_START);

    /* main processing loop */
    for (;;) {
        xStatus = xQueueReceive(network_queue, &msg, portMAX_DELAY);

        if (xStatus == pdPASS) {
            // pass the event to the sync processor
            NM.event_parameters = &msg;
            NM.Machine.Event = msg.trigger;
            if (dispatch_event(SM, 1, event_logger, result_logger) == EVENT_UN_HANDLED) {
                network_manager_format_from_to_states(ESP_LOG_ERROR,"Unhandled Event",NULL,NM.Machine.State,msg.trigger,false,"network manager");
            }
        } /* end of if status=pdPASS */
    }     /* end of for loop */

    vTaskDelete(NULL);
}



 int get_max_substate(nm_state_t state){
     for(int i=0;state_max[i].parent_state!=-1;i++){
         if(state_max[i].parent_state == state){
             return state_max[i].sub_state_last;
         }
     }
     return -1;
 }
esp_err_t network_register_state_callback(nm_state_t state,int sub_state, const char* from, network_status_reached_cb cb) {
    const char * error_prefix = "Error registering callback for State" ;
    network_callback_t* item = NULL;
    if (!cb) {
        return ESP_ERR_INVALID_ARG;
    }
    item = calloc(1, sizeof(*item));
    if (item == NULL) {
        ESP_LOGE(TAG,"%s %s. Memory allocation failed",error_prefix, nm_state_to_string(state));
        return ESP_ERR_NO_MEM;
    }
    if(sub_state != -1 && sub_state>get_max_substate(state)){
        // sub state has to be valid
        ESP_LOGE(TAG,"%s %s. Substate %d/%d %s",error_prefix, nm_state_to_string(state), sub_state,get_max_substate(state), sub_state>get_max_substate(state)?"out of boundaries":"invalid");
        return ESP_ERR_INVALID_ARG;
    }
    ESP_LOGI(TAG,"Registering callback for State %s, substate %s: %s", nm_state_to_string(state), sub_state_id_to_string(state,sub_state), from);
    item->state = state;
    item->cb = cb;
    item->from = from;
    item->sub_state=sub_state;
    
    network_callback_t* last = SLIST_FIRST(&s_cb_list);
    if (last == NULL) {
        SLIST_INSERT_HEAD(&s_cb_list, item, next);
    } else {
        network_callback_t* it;
        while ((it = SLIST_NEXT(last, next)) != NULL) {
            last = it;
        }
        SLIST_INSERT_AFTER(last, item, next);
    }
    return ESP_OK;
}
const state_t*  get_root( const state_t* const state){
    if(!state) return NULL;
    return state->Parent==NULL?state: get_root(state->Parent);
}
int get_root_id(const state_t *  state){
    if(!state) return -1;
    return state->Parent==NULL?state->Id: get_root_id(state->Parent);
}

static bool is_root_state(const state_t *  state){
    return state->Parent==NULL;
}
static bool is_current_state(const state_t*  state, nm_state_t  state_id, int sub_state_id){
    return get_root(state)->Id == state_id && (sub_state_id==-1 || (!is_root_state(state) && state->Id == sub_state_id) );
}

void network_execute_cb(state_machine_t* const state_machine, const char * caller) {
    network_callback_t* it;
    bool found=false;
    ESP_LOGI(TAG,"Checking if we need to invoke callbacks. ");
    SLIST_FOREACH(it, &s_cb_list, next) {
        if (is_current_state(state_machine->State,it->state, it->sub_state)) {
            char * cb_prefix= messaging_alloc_format_string("BEGIN Executing Callback %s", it->from) ;
            NETWORK_DEBUG_STATE_MACHINE(true,STR_OR_BLANK(cb_prefix),state_machine,false, STR_OR_BLANK(caller));    
            FREE_AND_NULL(cb_prefix);
            it->cb((nm_state_t)get_root(state_machine->State)->Id, is_root_state(state_machine->State)?-1:state_machine->State->Id);
            found = true;
            cb_prefix= messaging_alloc_format_string("END Executing Callback %s", it->from) ;
            NETWORK_DEBUG_STATE_MACHINE(false,STR_OR_BLANK(cb_prefix),state_machine,false, STR_OR_BLANK(caller));    
            FREE_AND_NULL(cb_prefix);
        }
    }
    if(!found){
        NETWORK_DEBUG_STATE_MACHINE(true,"No Callback found ",state_machine,false, STR_OR_BLANK(caller));    
    }
}

bool network_is_wifi_prioritized() {
    eth_config_t eth_config;
    config_eth_init(&eth_config);
    // char* prioritize = (char*)config_alloc_get_default(NVS_TYPE_STR, "prio_wifi", "N", 0);
    // bool result = strcasecmp("N", prioritize);
    bool result = s_wifi_prioritized;
    if(result){
        result = network_wifi_get_known_count()>0 || !eth_config.valid;
        ESP_LOGD(TAG,"Wifi is prioritized with %d known access points.%s %s",network_wifi_get_known_count(),eth_config.valid?" And a valid ethernet adapter":"",result?"Wifi prioritized":"Ethernet prioritized");
    }
    return result;
}

void network_prioritize_wifi(bool activate) {
    if(s_wifi_prioritized == activate) return;
    s_wifi_prioritized = activate;
    ESP_LOGI(TAG,"Wifi is %s prioritized",activate?"":"not");
    // if (network_is_wifi_prioritized() != activate) {
    //     ESP_LOGW(TAG, "Wifi will %s be prioritized on next boot", activate ? "" : "NOT");
    //     config_set_value(NVS_TYPE_STR, "prio_wifi", activate ? "Y" : "N");
    // }
}


void network_manager_format_state_machine(esp_log_level_t level, const char* prefix, state_machine_t* state_machine, bool show_source, const char * caller) {
    state_t const* source_state = NULL;
    state_t const* current_state = NULL;
    network_event_t event = -1;
    MEMTRACE_PRINT_DELTA();
    if (state_machine) {
        source_state = ((network_t *)state_machine)->source_state;
        current_state = state_machine->State;
        event = state_machine->Event;
        network_manager_format_from_to_states(level, prefix, source_state, current_state, event, show_source,caller);
    }
    else {
        ESP_LOG_LEVEL(level, TAG, "%s - %s -> [%s]",
                        STR_OR_BLANK(caller),
                        prefix,
                        event_to_string(event));
    }


}
void network_manager_format_from_to_states(esp_log_level_t level, const char* prefix,  const state_t * from_state,const state_t * current_state,  network_event_t event,bool show_source, const char * caller) {
    const char* source_state = "";
    const char* source_sub_state = "";
    const char* state = "N/A";
    const char* sub_state = "N/A";

    if (current_state) {
        state = state_to_string(current_state);
        sub_state = sub_state_to_string(current_state);
    }
    if (!from_state) {
        source_state = "N/A";
    } else {
        source_state = state_to_string(from_state);
        source_sub_state = sub_state_to_string(from_state);
    }
    if (show_source) {
        ESP_LOG_LEVEL(level, TAG, "%s %s %s.%s->%s.%s [evt:%s]",
                      STR_OR_BLANK(caller),
                      prefix,
                      source_state,
                      source_sub_state,
                      state,
                      sub_state,
                      event_to_string(event));
    } else {
        ESP_LOG_LEVEL(level, TAG, "%s %s %s(%s) [%s]",
                      STR_OR_BLANK(caller),
                      prefix,
                      state,
                      sub_state,
                      event_to_string(event));
    }
}
void network_async(network_event_t trigger) {
    queue_message msg;
    memset(&msg,0x00,sizeof(msg));
    msg.trigger = trigger;
    ESP_LOGD(TAG, "Posting event %s directly", event_to_string(trigger));
    xQueueSendToBack(network_queue, &msg, portMAX_DELAY);
}
void network_async_fail() {
    network_async(EN_FAIL);
}
void network_async_success() {
    network_async(EN_SUCCESS);
}
void network_async_connected(){
    network_async(EN_CONNECTED);
}
void network_async_link_up() {
    network_async(EN_LINK_UP);
}
void network_async_link_down() {
    network_async(EN_LINK_DOWN);
}
void network_async_configure() {
    network_async(EN_CONFIGURE);
}
void network_async_got_ip() {
    network_async(EN_GOT_IP);
}
void network_async_eth_got_ip() {
    network_async(EN_ETH_GOT_IP);
}
void network_async_timer() {
    network_async(EN_TIMER);
}
void network_async_start() {
    network_async(EN_START);
}
void network_async_scan() {
    network_async(EN_SCAN);
}

void network_async_update_status() {
    network_async(EN_UPDATE_STATUS);
}

void network_async_delete() {
    network_async(EN_DELETE);
}

void network_async_scan_done() {
    network_async(EN_SCAN_DONE);
}
void network_async_connect(const char * ssid, const char * password) {
    queue_message msg;
    memset(&msg,0x00,sizeof(msg));
    msg.trigger = EN_CONNECT_NEW;
    msg.ssid = strdup_psram(ssid);
    if(password && strlen(password) >0){
        msg.password = strdup_psram(password);
    }
    ESP_LOGD(TAG, "Posting event %s", event_to_string(msg.trigger));
    xQueueSendToBack(network_queue, &msg, portMAX_DELAY);
}
void network_async_lost_connection(wifi_event_sta_disconnected_t* disconnected_event) {
    queue_message msg;
    memset(&msg,0x00,sizeof(msg));
    msg.trigger = EN_LOST_CONNECTION;
    ESP_LOGD(TAG, "Posting event %s", event_to_string(msg.trigger));
    msg.disconnected_event =  clone_obj_psram(disconnected_event,sizeof(wifi_event_sta_disconnected_t));
    if(msg.disconnected_event){
        xQueueSendToBack(network_queue, &msg, portMAX_DELAY);
    }
    else {
        ESP_LOGE(TAG,"Unable to post lost connection event.");
    }
}
void network_async_reboot(reboot_type_t rtype) {
    queue_message msg;
    memset(&msg,0x00,sizeof(msg));
    msg.trigger = EN_REBOOT;
    msg.rtype = rtype;
    ESP_LOGD(TAG, "Posting event %s - type %d", event_to_string(msg.trigger),rtype);
    xQueueSendToBack(network_queue, &msg, portMAX_DELAY);
}

void network_reboot_ota(char* url) {
    queue_message msg;
    memset(&msg,0x00,sizeof(msg));

    if (url == NULL) {
        msg.trigger = EN_REBOOT;
        msg.rtype = OTA;
        ESP_LOGD(TAG, "Posting event %s - type %d", event_to_string(msg.trigger),msg.rtype);
    } else {
        msg.trigger = EN_REBOOT_URL;
        ESP_LOGD(TAG, "Posting event %s - type reboot URL", event_to_string(msg.trigger));
        msg.strval = strdup_psram(url);
    }
    
    xQueueSendToBack(network_queue, &msg, portMAX_DELAY);
}

network_t* network_get_state_machine() {
    return &NM;
}

static void network_timer_cb(void* timer_id) {
    network_async_timer();
}
esp_netif_t* network_get_active_interface() {
    if (NM.wifi_ap_netif && (network_wifi_is_ap_mode() || network_wifi_is_ap_sta_mode())) {
        return NM.wifi_ap_netif;
    } else if (NM.wifi_netif && network_wifi_is_sta_mode()) {
        return NM.wifi_netif;
    }
    return NM.eth_netif;
}
bool network_is_interface_connected(esp_netif_t* interface) {
    esp_err_t err = ESP_OK;
    tcpip_adapter_ip_info_t ipInfo;
    if(!interface){
        return false;
    }
    err = network_get_ip_info_for_netif(interface, &ipInfo);
    if(err != ESP_OK){
        ESP_LOGD(TAG,"network_get_ip_info_for_netif returned %s", esp_err_to_name(err));
    }
    return ((err == ESP_OK) && (ipInfo.ip.addr != IPADDR_ANY));
}
static esp_netif_t* get_connected_interface() {
    esp_netif_t* interface = NULL;
    for (int i = 0; i < 4; i++) {
        switch (i) {
            case 0:
                // try the active interface
                interface = network_get_active_interface();
                break;
            case 1:
                interface = NM.wifi_ap_netif;
                break;
            case 2:
                interface = NM.wifi_netif;
                break;
            case 3:
                interface = NM.eth_netif;
                break;
            default:
                break;
        }
        if (interface && network_is_interface_connected(interface)) {
            ESP_LOGD(TAG,"Found connected interface in iteration #%d",i);
            return interface;
        }
    }
    ESP_LOGD(TAG,"No connected interface found");
    return NULL;
}
esp_err_t network_get_ip_info_for_netif(esp_netif_t* netif, tcpip_adapter_ip_info_t* ipInfo) {
    esp_netif_ip_info_t loc_ip_info;
    if (!ipInfo ) {
        ESP_LOGE(TAG, "Invalid pointer for ipInfo");
        return ESP_ERR_INVALID_ARG;
    }
    if (!netif) {
        ESP_LOGE(TAG, "Invalid pointer for netif");
        return ESP_ERR_INVALID_ARG;
    }
    memset(ipInfo,0x00,sizeof(tcpip_adapter_ip_info_t));
    esp_err_t err= esp_netif_get_ip_info(netif, &loc_ip_info);
    if(err==ESP_OK){
        ip4_addr_set(&(ipInfo->ip),&loc_ip_info.ip);
        ip4_addr_set(&(ipInfo->gw),&loc_ip_info.gw);
        ip4_addr_set(&(ipInfo->netmask),&loc_ip_info.netmask);
    }
    return err;
}
esp_err_t network_get_ip_info(tcpip_adapter_ip_info_t* ipInfo) {
    esp_netif_t* netif= get_connected_interface();
    if(netif){
        return network_get_ip_info_for_netif(netif,ipInfo);
    }
    return ESP_FAIL;
}

esp_err_t network_get_hostname(const char** hostname) {
    return esp_netif_get_hostname(get_connected_interface(), hostname);
}

void network_set_timer(uint16_t duration, const char * tag) {
    if (duration > 0) {
        if(tag){
            ESP_LOGD(TAG, "Setting timer tag to %s", tag);
            NM.timer_tag = strdup_psram(tag);
        }
        if (!NM.state_timer) {
            ESP_LOGD(TAG, "Starting %s timer with period of %u ms.", STR_OR_ALT(NM.timer_tag,"anonymous"), duration);
            NM.state_timer = xTimerCreate("background STA", pdMS_TO_TICKS(duration), pdFALSE, NULL, network_timer_cb);
        } else {
            ESP_LOGD(TAG, "Changing %s timer period to %u ms.", STR_OR_ALT(NM.timer_tag,"anonymous"),duration);
            xTimerChangePeriod(NM.state_timer, pdMS_TO_TICKS(duration), portMAX_DELAY);
        }
        xTimerStart(NM.state_timer, portMAX_DELAY);
    } else if (NM.state_timer) {
        ESP_LOGD(TAG,"Stopping timer %s",STR_OR_ALT(NM.timer_tag,"anonymous"));
        xTimerStop(NM.state_timer, portMAX_DELAY);
        FREE_AND_NULL(NM.timer_tag);
    }

}
void network_ip_event_handler(void* arg, esp_event_base_t event_base, int32_t event_id, void* event_data) {
    ip_event_got_ip_t* s = NULL;
    esp_netif_ip_info_t* ip_info = NULL;

    if (event_base != IP_EVENT)
        return;
    switch (event_id) {
        case IP_EVENT_ETH_GOT_IP:
        case IP_EVENT_STA_GOT_IP:
            s = (ip_event_got_ip_t*)event_data;
            ip_info = &s->ip_info;
            ESP_LOGI(TAG, "Got an IP address from interface %s. IP=" IPSTR ", Gateway=" IPSTR ", NetMask=" IPSTR ", %s",
                     event_id == IP_EVENT_ETH_GOT_IP ? "Eth" : event_id == IP_EVENT_STA_GOT_IP ? "Wifi"
                                                                                               : "Unknown",
                     IP2STR(&ip_info->ip),
                     IP2STR(&ip_info->gw),
                     IP2STR(&ip_info->netmask),
                     s->ip_changed ? "Address was changed" : "Address unchanged");
            network_async(event_id == IP_EVENT_ETH_GOT_IP ? EN_ETH_GOT_IP : EN_GOT_IP);
            break;
        case IP_EVENT_STA_LOST_IP:
            ESP_LOGD(TAG, "IP_EVENT_STA_LOST_IP");
            break;
        case IP_EVENT_AP_STAIPASSIGNED:
            ESP_LOGD(TAG, "IP_EVENT_AP_STAIPASSIGNED");
            break;
        case IP_EVENT_GOT_IP6:
            ESP_LOGD(TAG, "IP_EVENT_GOT_IP6");
            break;
        default:
            break;
    }
}
char * alloc_get_host_name(){
    ESP_LOGD(TAG, "Retrieving host name from nvs");
    char* host_name = (char*)config_alloc_get(NVS_TYPE_STR, "host_name");
    if (host_name == NULL) {
        ESP_LOGE(TAG, "Could not retrieve host name from nvs");
    } 
    return host_name;
}
void network_set_hostname(esp_netif_t* interface) {
    esp_err_t err;
    char * host_name = alloc_get_host_name();
    if(!host_name) return;
    ESP_LOGD(TAG, "Setting host name to : %s", host_name);
    if ((err = esp_netif_set_hostname(interface, host_name)) != ESP_OK) {
        ESP_LOGE(TAG, "Unable to set host name. Error: %s", esp_err_to_name(err));
    }
    free(host_name);
}
#define LOCAL_MAC_SIZE 20
char* network_manager_alloc_get_mac_string(uint8_t mac[6]) {
    char* macStr = malloc_init_external(LOCAL_MAC_SIZE);
    if(macStr){
        snprintf(macStr, LOCAL_MAC_SIZE, MACSTR, MAC2STR(mac));
    }
    return macStr;
}