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diff --git a/firmwares/wifishield/wifiHD/src/wl_cm.c b/firmwares/wifishield/wifiHD/src/wl_cm.c
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-/* This source file is part of the ATMEL AVR-UC3-SoftwareFramework-1.7.0 Release */
-
-/*! \page License
- * Copyright (C) 2009, H&D Wireless AB All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions are met:
- *
- * 1. Redistributions of source code must retain the above copyright notice,
- * this list of conditions and the following disclaimer.
- *
- * 2. Redistributions in binary form must reproduce the above copyright notice,
- * this list of conditions and the following disclaimer in the documentation
- * and/or other materials provided with the distribution.
- *
- * 3. The name of H&D Wireless AB may not be used to endorse or promote products derived
- * from this software without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY H&D WIRELESS AB ``AS IS'' AND ANY EXPRESS OR IMPLIED
- * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
- * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE EXPRESSLY AND
- * SPECIFICALLY DISCLAIMED. IN NO EVENT SHALL ATMEL BE LIABLE FOR ANY DIRECT,
- * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
- * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
- * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
- * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
- * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
- * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- */
-#include "wl_cm.h"
-#include "util.h"
-#include <string.h>
-#include "debug.h"
-
-/** Roaming configuration parameters **/
-
-/*! The ROAMING_RSSI_THRESHOLD setting defines how bad the current
- * signal strength should be before we'll consider roaming to an AP
- * with better signal strength. The objective is to stay on the
- * current AP as long as the RSSI is decent, even if there are other
- * APs in the same BSS with better RSSI available.
- * If ROAMING_RSSI_THRESHOLD is too high we might roam unecessarily.
- * If ROAMING_RSSI_THRESHOLD is too low we might not roam in time to
- * avoid packet loss. This also impacts power consumption, staying
- * too long with an AP with poor RSSI will consume more power.
- * Unit is dBm.
- */
-#define ROAMING_RSSI_THRESHOLD -65
-
-/*! The ROAMING_RSSI_DIFF setting defines how much better
- * than the currently associated AP a new AP must be before
- * we'll attempt to roam over to the new AP.
- * If ROAMING_RSSI_DIFF is too high it might be too hard
- * to roam (important if the STA is expected to move
- * quickly through different AP coverage areas).
- * If ROAMING_RSSI_DIFF is too low we might bounce between
- * two APs with similar signal strengths.
- * Unit is dBm.
- */
-#define ROAMING_RSSI_DIFF 10
-
-# include "printf-stdarg.h"
-#include "ard_utils.h"
-#include "debug.h"
-
-/** \defgroup wl_cm Connection Manager
- *
- * These functions are used to configure and control the WiFi connetion
- * manager.
- *
- *
- * @{
- */
-
-struct cm_candidate {
- struct wl_ssid_t ssid;
- struct wl_mac_addr_t bssid;
-};
-
-struct cm {
- cm_scan_cb_t *scan_cb;
- cm_conn_cb_t *conn_cb;
- cm_disconn_cb_t *disconn_cb;
- void* ctx;
- uint8_t enabled;
- struct cm_candidate candidate;
-};
-
-
-/**
- * This function can be modified to pick a network based on
- * application specific criteria.
- *
- * If the SSID can not be found in the scan list it will be
- * assumed to be a hidden SSID and the wl_connect() command
- * will be called to attempt to probe for the network and
- * connect to it.
- */
-static struct wl_network_t*
-find_best_candidate(struct cm* cm)
-{
- struct wl_network_list_t* netlist;
- struct wl_network_t *best_net = NULL;
- uint8_t i;
-
- if (wl_get_network_list(&netlist) != WL_SUCCESS)
- return NULL;
-
- if (netlist->cnt == 0)
- return NULL;
-
- for (i = 0; i < netlist->cnt; i++) {
- /* match on ssid */
- if (cm->candidate.ssid.len)
- if (!equal_ssid(&cm->candidate.ssid,
- &netlist->net[i]->ssid))
- continue;
-
- /* match bssid */
- if (strncmp((char*) cm->candidate.bssid.octet,
- "\xff\xff\xff\xff\xff\xff", 6))
- if (!equal_bssid(&cm->candidate.bssid,
- &netlist->net[i]->bssid))
- continue;
- /* check for best rssi. */
- if ( best_net &&
- ( best_net->rssi > netlist->net[i]->rssi) ) {
- continue;
- }
- best_net = netlist->net[i];
- }
-
- return best_net;
-}
-
-
-/**
- *
- */
-static void
-select_net(struct cm* cm)
-{
- struct wl_network_t *candidate_net;
- struct wl_network_t *current_net;
- struct wl_ssid_t *ssid_p;
-
- int ret;
-
- /* Nothing to do */
- if (0 == cm->candidate.ssid.len) {
- return;
- }
-
- current_net = wl_get_current_network();
- candidate_net = find_best_candidate(cm);
-
- /* Connected to the candidate? ... */
- if ( current_net == candidate_net ) {
- if ( current_net ) {
- /* ...yes, dont change. */
-
- return;
- }
- }
-
- /* Roaming checks */
- if (current_net && candidate_net) {
- /* Are we changing BSSs? */
- if ( equal_ssid(&candidate_net->ssid,
- &current_net->ssid)) {
-
- /* ...no. Does the currently connected
- * net have a decent RSSI?...*/
- if ( current_net->rssi > ROAMING_RSSI_THRESHOLD ) {
- /* ...yes, stay with it. */
- return;
- }
- /* ...no. Does the candidate have
- * sufficiently better RSSI to
- * motivate a switch to it? */
- if ( candidate_net->rssi < current_net->rssi +
- ROAMING_RSSI_DIFF) {
- return;
- }
- /* ...yes, try to roam to candidate_net */
- CM_DPRINTF("CM: Roaming from rssi %d to %d\n",
- current_net->rssi,
- candidate_net->rssi);
- }
- }
- /* a candidate is found */
- if (candidate_net) {
- /* We connect to a specific bssid here because
- * find_best_candidate() might have picked a
- * particulare AP among many with the same SSID.
- * wl_connect() would pick one of them at random.
- */
- ret = wl_connect_bssid(candidate_net->bssid);
- }
- /* no candidate found */
- else {
- CM_DPRINTF("CM: No candidate found for ssid \"%s\"\n",
- ssid2str(&cm->candidate.ssid));
- /* Might be a hidden SSID so we try to connect to it.
- * wl_connect() will trigger a directed scan
- * for the SSID in this case.
- */
- ssid_p = &cm->candidate.ssid;
- ret = wl_connect(ssid_p->ssid, ssid_p->len);
- }
- switch (ret) {
- case WL_SUCCESS :
- return;
- case WL_BUSY:
- wl_disconnect();
- return;
- case WL_RETRY:
- break;
- default :
- CM_DPRINTF("CM: failed to connect\n");
- break;
- }
-
- /* some operation failed or no candidate found */
- if (wl_scan() != WL_SUCCESS)
- CM_DPRINTF("CM: failed to scan\n");
-}
-
-
-/**
- *
- */
-static void
-wl_scan_complete_cb(void* ctx)
-{
- struct cm *cm = ctx;
-
- CM_DPRINTF("CM: scan completed\n");
-
- if (cm->scan_cb)
- cm->scan_cb(cm->ctx);
-
- if ( 0 == cm->enabled ) {
- return;
- }
- select_net(cm);
-}
-
-/**
- *
- */
-static void
-wl_media_connected_cb(void* ctx)
-{
- struct cm *cm = ctx;
- struct wl_network_t *net = wl_get_current_network();
- CM_DPRINTF("CM: connected to %s\n", ssid2str(&net->ssid));
- LINK_LED_ON();
- ERROR_LED_OFF();
- if (cm->conn_cb)
- cm->conn_cb(net, cm->ctx);
-}
-
-
-/**
- *
- */
-static void
-wl_conn_failure_cb(void* ctx)
-{
- struct cm *cm = ctx;
- CM_DPRINTF("CM: connect failed, scanning\n");
- ERROR_LED_ON();
- LINK_LED_OFF();
-
- if ( 0 == cm->enabled ) {
- return;
- }
- if (wl_scan() != WL_SUCCESS)
- /* should never happen */
- CM_DPRINTF("CM: could not start scan after connect fail!\n");
-}
-
-
-/**
- *
- */
-static void
-wl_conn_lost_cb(void* ctx)
-{
- struct cm *cm = ctx;
- CM_DPRINTF("CM: connection lost, scanning\n");
- LINK_LED_OFF();
- if (cm->disconn_cb)
- cm->disconn_cb(cm->ctx);
-
- if ( 0 == cm->enabled ) {
- return;
- }
- if (wl_scan() != WL_SUCCESS)
- /* should never happen */
- CM_DPRINTF("CM: could not start scan after connect lost!\n");
-}
-
-
-/**
- *
- */
-static void
-wl_event_cb(struct wl_event_t event, void* ctx)
-{
- struct cm *cm = ctx;
-
- switch (event.id) {
- case WL_EVENT_MEDIA_CONNECTED:
- wl_media_connected_cb(cm);
- break;
-
- case WL_EVENT_CONN_FAILURE:
- wl_conn_failure_cb(cm);
- break;
-
- case WL_EVENT_MEDIA_DISCONNECTED:
- CM_DPRINTF("CM: disconnected\n");
- wl_conn_lost_cb(cm);
- break;
-
- case WL_EVENT_SCAN_COMPLETE:
- wl_scan_complete_cb(cm);
- break;
-
- default:
- CM_DPRINTF("CM: unhandled event\n");
- };
-}
-
-static struct cm *cm = NULL;
-
-
-/**
- * Doesn't actually start the CM, just initializing. CM will run whenever
- * an valid ssid is set through wl_cm_set_network() and wl_cm_start()
- * has been called.
- */
-wl_err_t
-wl_cm_init(cm_scan_cb_t scan_cb,
- cm_conn_cb_t conn_cb,
- cm_disconn_cb_t disconn_cb,
- void* ctx)
-{
- if (cm != NULL)
- return WL_FAILURE;
-
- cm = calloc(1, sizeof(struct cm));
- if (cm == NULL) {
- CM_DPRINTF("CM: out of memory\n");
- return WL_FAILURE;
- }
-
- if (wl_register_event_cb(wl_event_cb, cm) != WL_SUCCESS) {
- CM_DPRINTF("CM: could not register event cb\n");
- return WL_FAILURE;
- }
-
- cm->scan_cb = scan_cb;
- cm->conn_cb = conn_cb;
- cm->disconn_cb = disconn_cb;
- cm->enabled = 0;
- cm->ctx = ctx;
-
- CM_DPRINTF("CM: initialized\n");
- return WL_SUCCESS;
-}
-
-wl_err_t
-wl_cm_start(void) {
- if (NULL == cm)
- return WL_FAILURE;
-
- cm->enabled = 1;
- return WL_SUCCESS;
-}
-
-wl_err_t
-wl_cm_stop(void) {
- if (NULL == cm)
- return WL_FAILURE;
-
- cm->enabled = 0;
- return WL_SUCCESS;
-}
-
-
-/**
- * Set the desired network which the connection manager should try to
- * connect to.
- *
- * The ssid and bssid of the desired network should be specified. The ssid and
- * bssid will be matched against the networks found during scan. If any
- * parameter is null, it will always match. If both parameters are null,
- * the first found network will be chosen.
- *
- * @param ssid The ssid of the desired network. If null, any ssid will match.
- * @param bssid The bssid of the desired network. If null, any bssid will match.
- *
- */
-wl_err_t
-wl_cm_set_network(struct wl_ssid_t *ssid, struct wl_mac_addr_t *bssid)
-{
- if (cm == NULL)
- return WL_FAILURE;
-
- if (ssid)
- memcpy(&cm->candidate.ssid, ssid, sizeof(cm->candidate.ssid));
- else
- cm->candidate.ssid.len = 0;
-
- if (bssid)
- memcpy(&cm->candidate.bssid, bssid,
- sizeof(cm->candidate.bssid));
- else
- memset(&cm->candidate.bssid, 0xff, sizeof(cm->candidate.bssid));
-
- if (cm->candidate.ssid.len)
- wl_scan();
-
- return WL_SUCCESS;
-}
-/*
- * @}
- */
generated by cgit v1.2.3-18-g5258 (git 2.32.0) at 2024-11-22 19:10:37 +0000