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sdk:scripts:scan-wlan [2015/05/05 17:04] (current)
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 +====== SDK Script scan-wlan.are ======
 +<code c scan-wlan.are>​
 +/* DESC: This script can be used to switch the WLAN client network according to availability
 + * Copyright (C) 2013 NetModule AG, Switzerland
 + */
 +
 +IFC = "​WLAN1";​
 +NETWORK = "";​
 +MIN_SIGNAL = -90;
 +
 +/* ATTENTION: Scanning for WLAN networks will tear down any running access-point */
 +nets = nb_scan_networks(IFC);​
 +nr_nets = struct_get(nets,​ "​NETWORK_COUNT"​);​
 +
 +if (is_void(nr_nets) || nr_nets < 1) {
 +    nb_syslog("​no networks found on %s", IFC);
 +    exit(0);
 +}
 +
 +/* lookup WLAN networks */
 +for (i = 1; i <= nr_nets; i++) {
 +    k = sprintf("​NETWORK%d_SSID",​ i);
 +    ssid = struct_get(nets,​ k);
 +    k = sprintf("​NETWORK%d_SIGNAL",​ i);    ​
 +    signal = (int)struct_get(nets,​ k);
 +
 +    if (strlen(ssid) == 0) continue;
 +
 +    nb_syslog("​detected %s network '​%s'​ (signal %d)", IFC, ssid, signal);
 +
 +    if ((ssid == "​home-network"​ || ssid == "​office-network"​) && signal > MIN_SIGNAL) {
 +        NETWORK = ssid;       
 +        break;
 +    }
 +}
 +
 +if (NETWORK != ""​) {
 +    nb_syslog("​activating %s network '​%s'",​ IFC, NETWORK);
 +    cfg = sprintf("​wlan.0.client.0.ssid=%s",​ NETWORK);
 +    nb_config_set(cfg);​
 +} else {
 +    nb_syslog("​no known networks found on %s", IFC);
 +}
 +
 +exit(0);
 +
 +</​code>​