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83 lines
2.1 KiB
83 lines
2.1 KiB
3 years ago
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/**
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* DHCP watchdog
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*
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* This is a workaround for a rare case where we don't get
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* any IP after connecting with STA. If it takes too long,
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* try power-cycling the DHCP client. If that fails too,
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* try cycling the WiFi stack too.
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*
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* This does not try to reboot, as there are valid cases when this
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* can happen - e.g. no DHCP on the network + no static IP configured yet.
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*
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* The ping component is used as a dependency.
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*/
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#ifndef _DHCP_WD_H_
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#define _DHCP_WD_H_
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#include "esp_netif.h"
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#include "esp_event.h"
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#include "freertos/FreeRTOS.h"
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#include "freertos/task.h"
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typedef struct dhcp_wd_instance * dhcp_wd_handle_t;
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/**
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* Start the watchdog. Handle must remain valid until the task is deleted.
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*
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* @param[in] iface
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* @param[out] handle - pointer to a handle variable (will be written to it)
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* @return success
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*/
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esp_err_t dhcp_watchdog_start(esp_netif_t * netif, bool is_wifi, dhcp_wd_handle_t *pHandle);
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/**
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* Check if a watchdog is running
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*
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* @param[in] handle
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* @return is running
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*/
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bool dhcp_watchdog_is_running(dhcp_wd_handle_t handle);
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/**
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* Stop the watchdog and free resources.
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* The handle becomes invalid and is set to NULL.
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*
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* @param[in] handle
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* @return success
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*/
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esp_err_t dhcp_watchdog_stop(dhcp_wd_handle_t *pHandle);
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enum dhcp_wd_event {
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DHCP_WD_NOTIFY_CONNECTED,
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DHCP_WD_NOTIFY_DISCONNECTED,
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DHCP_WD_NOTIFY_GOT_IP,
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};
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/**
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* @brief Notify the watchdog task about a wifi state change
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*
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* Call this from the WiFi event handler.
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*
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* @param[in] handle
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* @param[in] event - detected event
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*/
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esp_err_t dhcp_watchdog_notify(dhcp_wd_handle_t handle, enum dhcp_wd_event);
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enum dhcp_wd_test_result {
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DHCP_WD_RESULT_OK = 0,
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DHCP_WD_RESULT_PING_LOST,
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DHCP_WD_RESULT_NO_GATEWAY,
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};
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/**
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* Manually trigger a connection test by pinging the gateway.
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* This is independent on any watchdog tasks and can be run without starting the watchdog.
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*
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* @param[in] iface - network interface, typically TCPIP_ADAPTER_IF_STA
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* @return test result
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*/
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enum dhcp_wd_test_result dhcp_wd_test_connection(esp_netif_t *iface);
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#endif //_DHCP_WD_H_
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