mirror/librenms-librenms
1
0
Fork 0
mirror of https://github.com/librenms/librenms.git synced 2024-10-07 16:52:45 +00:00
Code Issues Actions Packages Projects Releases Wiki Activity

disable snmp timeout/retries as defaults

Browse Source 
git-svn-id: http://www.observium.org/svn/observer/trunk@1720 61d68cd4-352d-0410-923a-c4978735b2b8
This commit is contained in:
Adam Amstrong
2010-10-07 18:12:35 +00:00
parent 60a9f84b02
commit e3b2bc788c
2 changed files with 89 additions and 60 deletions
Download Patch File Download Diff File Expand all files Collapse all files

6
includes/defaults.inc.php
View File

@@ -57,9 +57,9 @@ $config['show_locations_dropdown'] = 1; # Enable Locations dropdown on menu
$config['show_services'] = 1; # Enable Services on menu
$config['ports_page_default'] = "details/"; ## eg "details/" "graphs/bits/"
### SNMP Settings
$config['snmp']['timeout'] = 1; # timeout in seconds
$config['snmp']['retries'] = 5; # how many times to retry the query
### SNMP Settings - Timeouts/Retries disabled as default
#$config['snmp']['timeout'] = 1; # timeout in seconds
#$config['snmp']['retries'] = 5; # how many times to retry the query
$config['snmp']['community'][] = "public"; # Communities to try during discovery (dangerous)
$config['snmp']['internal'] = false; # Enable php_snmp functions to make gets faster

143
includes/snmp.inc.php
View File

@@ -8,8 +8,8 @@
function snmp_get_multi($device, $oids, $options = "-OQUs", $mib = NULL, $mibdir = NULL) {
global $debug,$config,$runtime_stats,$mibs_loaded;
if ($device['timeout'] == NULL) { $timeout = $config['snmp']['timeout']; } else { $timeout = $device['timeout']; }
if ($device['retries'] == NULL) { $retries = $config['snmp']['retries']; } else { $retries = $device['retries']; }
if (is_numeric($device['timeout'])) { $timeout = $device['timeout']; } elseif (isset($config['snmp']['timeout'])) { $timeout = $config['snmp']['timeout']; }
if (is_numeric($device['retries'])) { $timeout = $device['retries']; } elseif (isset($config['snmp']['retries'])) { $timeout = $config['snmp']['retries']; }
if ($config['snmp']['internal'] == true) {
if ($mib && $mibdir && !$mibs_loaded[$mib])
@@ -20,11 +20,11 @@ function snmp_get_multi($device, $oids, $options = "-OQUs", $mib = NULL, $mibdir
snmp_set_quick_print(1);
$oids = explode(" ",trim($oids));
// s->ms - php snmp extension requires the timeout in microseconds.
$timeout = $timeout*1000*1000;
if(isset($timeout)) { $timeout = $timeout*1000*1000; }
foreach($oids as $oid) {
if($device['snmpver'] == "v2c") {
if ($device['snmpver'] == "v2c") {
$data = @snmp2_get($device['hostname'].":".$device['port'], $device['community'], $oid, $timeout, $retries);
} elseif( $device['snmpver'] == "v1") {
} elseif ( $device['snmpver'] == "v1") {
$data = @snmpget($device['hostname'].":".$device['port'], $device['community'], $oid, $timeout, $retries);
}
@@ -32,19 +32,21 @@ function snmp_get_multi($device, $oids, $options = "-OQUs", $mib = NULL, $mibdir
if ($data) { $array[$index][$oid] = $data; }
else { $array[$index][$oid] = null; }
}
}
else {
} else {
$cmd = $config['snmpget'] . " -" . $device['snmpver'] . " -c " . $device['community'] . " ";
if($options) { $cmd .= " " . $options; }
if($mib) { $cmd .= " -m " . $mib; }
if($mibdir) { $cmd .= " -M " . $mibdir; } else { $cmd .= " -M ".$config['mibdir']; }
$cmd .= " -t " . $timeout . " -r " . $retries;
if ($options) { $cmd .= " " . $options; }
if ($mib) { $cmd .= " -m " . $mib; }
if ($mibdir) { $cmd .= " -M " . $mibdir; } else { $cmd .= " -M ".$config['mibdir']; }
if (isset($timeout)) { $cmd .= " -t " . $timeout; }
if (isset($retries)) { $cmd .= " -r " . $retries; }
$cmd .= " ".$device['hostname'].":".$device['port']." ".$oids;
if (!$debug) { $cmd .= " 2>/dev/null"; }
if($debug) { echo("$cmd\n"); }
if ($debug) { echo("$cmd\n"); }
$data = trim(shell_exec($cmd));
$runtime_stats['snmpget']++;
if($debug) { echo("$data\n"); }
if ($debug) { echo("$data\n"); }
foreach(explode("\n", $data) as $entry) {
list($oid,$value) = explode("=", $entry);
$oid = trim($oid); $value = trim($value);
@@ -59,8 +61,8 @@ function snmp_get_multi($device, $oids, $options = "-OQUs", $mib = NULL, $mibdir
function snmp_get($device, $oid, $options = NULL, $mib = NULL, $mibdir = NULL) {
global $debug,$config,$runtime_stats,$mibs_loaded;
if ($device['timeout'] == NULL) { $timeout = $config['snmp']['timeout']; } else { $timeout = $device['timeout']; }
if ($device['retries'] == NULL) { $retries = $config['snmp']['retries']; } else { $retries = $device['retries']; }
if (is_numeric($device['timeout'])) { $timeout = $device['timeout']; } elseif (isset($config['snmp']['timeout'])) { $timeout = $config['snmp']['timeout']; }
if (is_numeric($device['retries'])) { $timeout = $device['retries']; } elseif (isset($config['snmp']['retries'])) { $timeout = $config['snmp']['retries']; }
if ($config['snmp']['internal'] == true)
{
if ($mib && $mibdir && !$mibs_loaded[$mib])
@@ -70,25 +72,28 @@ function snmp_get($device, $oid, $options = NULL, $mib = NULL, $mibdir = NULL) {
}
snmp_set_quick_print(1);
// s->ms - php snmp extension requires the timeout in microseconds.
$timeout = $timeout*1000*1000;
if($device['snmpver'] == "v2c")
if(isset($timeout)) { $timeout = $timeout*1000*1000; }
if ($device['snmpver'] == "v2c")
{
$data = @snmp2_get($device['hostname'].":".$device['port'], $device['community'], $oid, $timeout, $retries);
} elseif( $device['snmpver'] == "v1") {
} elseif ( $device['snmpver'] == "v1") {
$data = @snmpget($device['hostname'].":".$device['port'], $device['community'], $oid, $timeout, $retries);
}
if ($debug) { print "DEBUG: $oid: $data\n"; }
} else {
$cmd = $config['snmpget'] . " -" . $device['snmpver'] . " -c " . $device['community'] . " ";
if($options) { $cmd .= " " . $options; }
if($mib) { $cmd .= " -m " . $mib; }
if($mibdir) { $cmd .= " -M " . $mibdir; } else { $cmd .= " -M ".$config['mibdir']; }
$cmd .= " -t " . $timeout . " -r " . $retries;
if ($options) { $cmd .= " " . $options; }
if ($mib) { $cmd .= " -m " . $mib; }
if ($mibdir) { $cmd .= " -M " . $mibdir; } else { $cmd .= " -M ".$config['mibdir']; }
if (isset($timeout)) { $cmd .= " -t " . $timeout; }
if (isset($retries)) { $cmd .= " -r " . $retries; }
$cmd .= " ".$device['hostname'].":".$device['port']." ".$oid;
if (!$debug) { $cmd .= " 2>/dev/null"; }
if($debug) { echo("$cmd\n"); }
if ($debug) { echo("$cmd\n"); }
$data = trim(shell_exec($cmd));
if($debug) { echo("$data\n"); }
if ($debug) { echo("$data\n"); }
}
$runtime_stats['snmpget']++;
if (is_string($data) && (preg_match("/No Such Instance/i", $data) || preg_match("/No Such Object/i", $data) || preg_match("/No more variables left/i", $data))) { return false; }
@@ -98,8 +103,8 @@ function snmp_get($device, $oid, $options = NULL, $mib = NULL, $mibdir = NULL) {
function snmp_walk($device, $oid, $options = NULL, $mib = NULL, $mibdir = NULL) {
global $debug,$config,$runtime_stats;
if ($device['timeout'] == NULL) { $timeout = $config['snmp']['timeout']; } else { $timeout = $device['timeout']; }
if ($device['retries'] == NULL) { $retries = $config['snmp']['retries']; } else { $retries = $device['retries']; }
if (is_numeric($device['timeout'])) { $timeout = $device['timeout']; } elseif (isset($config['snmp']['timeout'])) { $timeout = $config['snmp']['timeout']; }
if (is_numeric($device['retries'])) { $timeout = $device['retries']; } elseif (isset($config['snmp']['retries'])) { $timeout = $config['snmp']['retries']; }
// php has no bulkwalk functionality, so use binary for this.
if ($device['snmpver'] == 'v1' || $config['os'][$device['os']]['nobulk']) {
$snmpcommand = $config['snmpwalk'];
@@ -108,15 +113,16 @@ function snmp_walk($device, $oid, $options = NULL, $mib = NULL, $mibdir = NULL)
$snmpcommand = $config['snmpbulkwalk'];
}
$cmd = $snmpcommand . " -" . $device['snmpver'] . " -c " . $device['community'] . " ";
if($options) { $cmd .= " $options "; }
if($mib) { $cmd .= " -m $mib"; }
if($mibdir) { $cmd .= " -M " . $mibdir; } else { $cmd .= " -M ".$config['mibdir']; }
$cmd .= " -t " . $timeout . " -r " . $retries;
if ($options) { $cmd .= " $options "; }
if ($mib) { $cmd .= " -m $mib"; }
if ($mibdir) { $cmd .= " -M " . $mibdir; } else { $cmd .= " -M ".$config['mibdir']; }
if (isset($timeout)) { $cmd .= " -t " . $timeout; }
if (isset($retries)) { $cmd .= " -r " . $retries; }
$cmd .= " ".$device['hostname'].":".$device['port']." ".$oid;
if (!$debug) { $cmd .= " 2>/dev/null"; }
if($debug) { echo("$cmd\n"); }
if ($debug) { echo("$cmd\n"); }
$data = trim(shell_exec($cmd));
if($debug) { echo("$data\n"); }
if ($debug) { echo("$data\n"); }
if (is_string($data) && (preg_match("/No Such (Object|Instance)/i", $data)))
{
$data = false;
@@ -135,8 +141,8 @@ function snmp_walk($device, $oid, $options = NULL, $mib = NULL, $mibdir = NULL)
function snmpwalk_cache_cip($device, $oid, $array, $mib = 0) {
global $config;
if ($device['timeout'] == NULL) { $timeout = $config['snmp']['timeout']; } else { $timeout = $device['timeout']; }
if ($device['retries'] == NULL) { $retries = $config['snmp']['retries']; } else { $retries = $device['retries']; }
if (is_numeric($device['timeout'])) { $timeout = $device['timeout']; } elseif (isset($config['snmp']['timeout'])) { $timeout = $config['snmp']['timeout']; }
if (is_numeric($device['retries'])) { $timeout = $device['retries']; } elseif (isset($config['snmp']['retries'])) { $timeout = $config['snmp']['retries']; }
if ($device['snmpver'] == 'v1' || $config['os'][$device['os']]['nobulk']) {
$snmpcommand = $config['snmpwalk'];
}
@@ -144,9 +150,10 @@ function snmpwalk_cache_cip($device, $oid, $array, $mib = 0) {
$snmpcommand = $config['snmpbulkwalk'];
}
$cmd = $snmpcommand . " -O snQ -" . $device['snmpver'] . " -c " . $device['community'] . " ";
if($mib) { $cmd .= " -m $mib"; }
if ($mib) { $cmd .= " -m $mib"; }
$cmd .= " -M ".$config['install_dir']."/mibs/";
$cmd .= " -t " . $timeout . " -r " . $retries;
if (isset($timeout)) { $cmd .= " -t " . $timeout; }
if (isset($retries)) { $cmd .= " -r " . $retries; }
$cmd .= " ".$device['hostname'].":".$device['port']." ".$oid;
if (!$debug) { $cmd .= " 2>/dev/null"; }
$data = trim(shell_exec($cmd));
@@ -165,8 +172,8 @@ function snmpwalk_cache_cip($device, $oid, $array, $mib = 0) {
$h_e = zeropad(dechex($e));
$h_f = zeropad(dechex($f));
$mac = "$h_a$h_b$h_c$h_d$h_e$h_f";
if($dir == "1") { $dir = "input"; } elseif($dir == "2") { $dir = "output"; }
if($mac && $dir) {
if ($dir == "1") { $dir = "input"; } elseif ($dir == "2") { $dir = "output"; }
if ($mac && $dir) {
$array[$ifIndex][$mac][$oid][$dir] = $this_value;
}
return $array;
@@ -176,6 +183,8 @@ function snmpwalk_cache_cip($device, $oid, $array, $mib = 0) {
function snmp_cache_ifIndex($device)
{
global $config;
if (is_numeric($device['timeout'])) { $timeout = $device['timeout']; } elseif (isset($config['snmp']['timeout'])) { $timeout = $config['snmp']['timeout']; }
if (is_numeric($device['retries'])) { $timeout = $device['retries']; } elseif (isset($config['snmp']['retries'])) { $timeout = $config['snmp']['retries']; }
if ($device['snmpver'] == 'v1' || $config['os'][$device['os']]['nobulk'])
{
$snmpcommand = $config['snmpwalk'];
@@ -187,7 +196,8 @@ function snmp_cache_ifIndex($device)
$cmd = $snmpcommand . " -O Qs -" . $device['snmpver'] . " -c " . $device['community'] . " ";
$cmd .= " -M ".$config['install_dir']."/mibs/";
$cmd .= " -m IF-MIB ifIndex";
$cmd .= " -t " . $timeout . " -r " . $retries . " " . $device['hostname'].":".$device['port'];
if (isset($timeout)) { $cmd .= " -t " . $timeout; }
if (isset($retries)) { $cmd .= " -r " . $retries; }
if (!$debug) { $cmd .= " 2>/dev/null"; }
$data = trim(shell_exec($cmd));
$device_id = $device['device_id'];
@@ -197,7 +207,7 @@ function snmp_cache_ifIndex($device)
$this_index = trim($this_index);
$this_oid = trim($this_oid);
$this_value = trim($this_value);
if(!strstr($this_value, "at this OID") && $this_index) {
if (!strstr($this_value, "at this OID") && $this_index) {
$array[] = $this_value;
}
}
@@ -227,11 +237,11 @@ function snmpwalk_cache_multi_oid($device, $oid, $array, $mib = NULL, $mibdir =
$oid_parts = explode(".", $oid);
$oid = $oid_parts['0'];
$index = $oid_parts['1'];
if(isset($oid_parts['2'])) { $index .= ".".$oid_parts['2']; }
if(isset($oid_parts['3'])) { $index .= ".".$oid_parts['3']; }
if(isset($oid_parts['4'])) { $index .= ".".$oid_parts['4']; }
if(isset($oid_parts['5'])) { $index .= ".".$oid_parts['5']; }
if(isset($oid_parts['6'])) { $index .= ".".$oid_parts['6']; }
if (isset($oid_parts['2'])) { $index .= ".".$oid_parts['2']; }
if (isset($oid_parts['3'])) { $index .= ".".$oid_parts['3']; }
if (isset($oid_parts['4'])) { $index .= ".".$oid_parts['4']; }
if (isset($oid_parts['5'])) { $index .= ".".$oid_parts['5']; }
if (isset($oid_parts['6'])) { $index .= ".".$oid_parts['6']; }
if (!strstr($value, "at this OID") && isset($oid) && isset($index)) {
$array[$index][$oid] = $value;
}
@@ -275,6 +285,8 @@ function snmpwalk_cache_triple_oid($device, $oid, $array, $mib = NULL, $mibdir =
function snmpwalk_cache_twopart_oid($device, $oid, $array, $mib = 0)
{
global $config;
if (is_numeric($device['timeout'])) { $timeout = $device['timeout']; } elseif (isset($config['snmp']['timeout'])) { $timeout = $config['snmp']['timeout']; }
if (is_numeric($device['retries'])) { $timeout = $device['retries']; } elseif (isset($config['snmp']['retries'])) { $timeout = $config['snmp']['retries']; }
if ($device['snmpver'] == 'v1' || $config['os'][$device['os']]['nobulk'])
{
$snmpcommand = $config['snmpwalk'];
@@ -285,8 +297,9 @@ function snmpwalk_cache_twopart_oid($device, $oid, $array, $mib = 0)
}
$cmd = $snmpcommand . " -O QUs -" . $device['snmpver'] . " -c " . $device['community'] . " ";
$cmd .= " -M ".$config['install_dir']."/mibs/";
if($mib) { $cmd .= " -m $mib"; }
$cmd .= " -t " . $timeout . " -r " . $retries;
if ($mib) { $cmd .= " -m $mib"; }
if (isset($timeout)) { $cmd .= " -t " . $timeout; }
if (isset($retries)) { $cmd .= " -r " . $retries; }
$cmd .= " ".$device['hostname'].":".$device['port']." ".$oid;
if (!$debug) { $cmd .= " 2>/dev/null"; }
$data = trim(shell_exec($cmd));
@@ -304,6 +317,8 @@ function snmpwalk_cache_twopart_oid($device, $oid, $array, $mib = 0)
function snmpwalk_cache_threepart_oid($device, $oid, $array, $mib = 0) {
global $config, $debug;
if (is_numeric($device['timeout'])) { $timeout = $device['timeout']; } elseif (isset($config['snmp']['timeout'])) { $timeout = $config['snmp']['timeout']; }
if (is_numeric($device['retries'])) { $timeout = $device['retries']; } elseif (isset($config['snmp']['retries'])) { $timeout = $config['snmp']['retries']; }
if ($device['snmpver'] == 'v1' || $config['os'][$device['os']]['nobulk'])
{
$snmpcommand = $config['snmpwalk'];
@@ -314,8 +329,9 @@ function snmpwalk_cache_threepart_oid($device, $oid, $array, $mib = 0) {
}
$cmd = $snmpcommand . " -O QUs -" . $device['snmpver'] . " -c " . $device['community'] . " ";
$cmd .= " -M ".$config['install_dir']."/mibs/";
if($mib) { $cmd .= " -m $mib"; }
$cmd .= " -t " . $timeout . " -r " . $retries;
if ($mib) { $cmd .= " -m $mib"; }
if (isset($timeout)) { $cmd .= " -t " . $timeout; }
if (isset($retries)) { $cmd .= " -r " . $retries; }
$cmd .= " ".$device['hostname'].":".$device['port']." ".$oid;
if (!$debug) { $cmd .= " 2>/dev/null"; }
$data = trim(shell_exec($cmd));
@@ -324,7 +340,7 @@ function snmpwalk_cache_threepart_oid($device, $oid, $array, $mib = 0) {
list($oid,$value) = explode("=", $entry);
$oid = trim($oid); $value = trim($value); $value = str_replace("\"", "", $value);
list($oid, $first, $second, $third) = explode(".", $oid);
if($debug) {echo("$entry || $oid || $first || $second || $third\n");}
if ($debug) {echo("$entry || $oid || $first || $second || $third\n");}
if (!strstr($value, "at this OID") && isset($oid) && isset($first) && isset($second) && isset($third)) {
$array[$first][$second][$third][$oid] = $value;
}
@@ -334,6 +350,8 @@ function snmpwalk_cache_threepart_oid($device, $oid, $array, $mib = 0) {
function snmp_cache_slotport_oid($oid, $device, $array, $mib = 0) {
global $config;
if (is_numeric($device['timeout'])) { $timeout = $device['timeout']; } elseif (isset($config['snmp']['timeout'])) { $timeout = $config['snmp']['timeout']; }
if (is_numeric($device['retries'])) { $timeout = $device['retries']; } elseif (isset($config['snmp']['retries'])) { $timeout = $config['snmp']['retries']; }
if ($device['snmpver'] == 'v1' || $config['os'][$device['os']]['nobulk'])
{
$snmpcommand = $config['snmpwalk'];
@@ -343,9 +361,10 @@ function snmp_cache_slotport_oid($oid, $device, $array, $mib = 0) {
$snmpcommand = $config['snmpbulkwalk'];
}
$cmd = $snmpcommand . " -O QUs -" . $device['snmpver'] . " -c " . $device['community'] . " ";
if($mib) { $cmd .= " -m $mib"; }
if ($mib) { $cmd .= " -m $mib"; }
$cmd .= " -M ".$config['install_dir']."/mibs/";
$cmd .= " -t " . $timeout . " -r " . $retries;
if (isset($timeout)) { $cmd .= " -t " . $timeout; }
if (isset($retries)) { $cmd .= " -r " . $retries; }
$cmd .= " ".$device['hostname'].":".$device['port']." ".$oid;
if (!$debug) { $cmd .= " 2>/dev/null"; }
$data = trim(shell_exec($cmd));
@@ -371,12 +390,16 @@ function snmp_cache_oid($oid, $device, $array, $mib = 0)
function snmp_cache_port_oids($oids, $port, $device, $array, $mib=0) {
global $config;
if (is_numeric($device['timeout'])) { $timeout = $device['timeout']; } elseif (isset($config['snmp']['timeout'])) { $timeout = $config['snmp']['timeout']; }
if (is_numeric($device['retries'])) { $timeout = $device['retries']; } elseif (isset($config['snmp']['retries'])) { $timeout = $config['snmp']['retries']; }
foreach($oids as $oid){
$string .= " $oid.$port";
}
$cmd = $config['snmpget'] . " -O vq -" . $device['snmpver'] . " -c " . $device['community'] . " ";
if (isset($timeout)) { $cmd .= " -t " . $timeout; }
if (isset($retries)) { $cmd .= " -r " . $retries; }
$cmd .= " -M ".$config['install_dir']."/mibs/";
if($mib) { $cmd .= " -m $mib"; }
if ($mib) { $cmd .= " -m $mib"; }
$cmd .= " -t " . $timeout . " -r " . $retries;
$cmd .= " ".$device['hostname'].":".$device['port']." ".$string;
if (!$debug) { $cmd .= " 2>/dev/null"; }
@@ -385,7 +408,7 @@ function snmp_cache_port_oids($oids, $port, $device, $array, $mib=0) {
$values = explode("\n", $data);
#echo("Caching: ifIndex $port\n");
foreach($oids as $oid){
if(!strstr($values[$x], "at this OID")) {
if (!strstr($values[$x], "at this OID")) {
$array[$port][$oid] = $values[$x];
}
$x++;
@@ -395,16 +418,19 @@ function snmp_cache_port_oids($oids, $port, $device, $array, $mib=0) {
function snmp_cache_portIfIndex ($device, $array) {
global $config;
if (is_numeric($device['timeout'])) { $timeout = $device['timeout']; } elseif (isset($config['snmp']['timeout'])) { $timeout = $config['snmp']['timeout']; }
if (is_numeric($device['retries'])) { $timeout = $device['retries']; } elseif (isset($config['snmp']['retries'])) { $timeout = $config['snmp']['retries']; }
$cmd = $config['snmpwalk'] . " -CI -m CISCO-STACK-MIB -O q -" . $device['snmpver'] . " -c " . $device['community'] . " ";
$cmd .= " -M ".$config['install_dir']."/mibs/";
$cmd .= " -t " . $timeout . " -r " . $retries;
if (isset($timeout)) { $cmd .= " -t " . $timeout; }
if (isset($retries)) { $cmd .= " -r " . $retries; }
$cmd .= " ".$device['hostname'].":".$device['port']." portIfIndex";
$output = trim(shell_exec($cmd));
$device_id = $device['device_id'];
foreach(explode("\n", $output) as $entry){
$entry = str_replace("CISCO-STACK-MIB::portIfIndex.", "", $entry);
list($slotport, $ifIndex) = explode(" ", $entry);
if($slotport && $ifIndex){
if ($slotport && $ifIndex){
$array[$ifIndex]['portIfIndex'] = $slotport;
$array[$slotport]['ifIndex'] = $ifIndex;
}
@@ -414,9 +440,12 @@ function snmp_cache_portIfIndex ($device, $array) {
function snmp_cache_portName ($device, $array) {
global $config;
if (is_numeric($device['timeout'])) { $timeout = $device['timeout']; } elseif (isset($config['snmp']['timeout'])) { $timeout = $config['snmp']['timeout']; }
if (is_numeric($device['retries'])) { $timeout = $device['retries']; } elseif (isset($config['snmp']['retries'])) { $timeout = $config['snmp']['retries']; }
$cmd = $config['snmpwalk'] . " -CI -m CISCO-STACK-MIB -O Qs -" . $device['snmpver'] . " -c " . $device['community'] . " ";
$cmd .= " -M ".$config['install_dir']."/mibs/";
$cmd .= " -t " . $timeout . " -r " . $retries;
if (isset($timeout)) { $cmd .= " -t " . $timeout; }
if (isset($retries)) { $cmd .= " -r " . $retries; }
$cmd .= " ".$device['hostname'].":".$device['port']." portName";
$output = trim(shell_exec($cmd));
$device_id = $device['device_id'];