packages/php-modbus
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Use microsecond precision instead of second for timeout when reading from sockets.

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Expose variables to configure socket read and write timeouts in  sec and usec (microseconds) precision
This commit is contained in:
toimtoimtoim
2016-11-04 22:02:04 +02:00
parent c18696a718
commit e10bb250d8
1 changed files with 21 additions and 9 deletions
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src/ModbusMaster.php
+21 -9
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@@ -59,6 +59,14 @@ class ModbusMaster
public $timeout_sec = 5; // Timeout 5 sec
public $timeout_usec = 0; // is added to $timeout_sec when calculating real read timeout
public $socket_read_timeout_usec = 300000; // socket read timeout 300 ms
public $socket_write_timeout_sec = 1; // socket write timeout 1 sec
public $socket_write_timeout_usec = 0; // socket write timeout microseconds (must be lower than 1 sec e.g. 1000000)
public $endianness = 0; // Endianness codding (little endian == 0, big endian == 1)
public $socket_protocol = "UDP"; // Socket protocol (TCP, UDP)
@@ -117,8 +125,10 @@ class ModbusMaster
$this->status .= "Bound\n";
}
}
// Socket settings
socket_set_option($this->sock, SOL_SOCKET, SO_SNDTIMEO, array('sec' => 1, 'usec' => 0));
// Socket settings (send/write timeout)
socket_set_option($this->sock, SOL_SOCKET, SO_SNDTIMEO,
array('sec' => $this->socket_write_timeout_sec, 'usec' => $this->socket_write_timeout_usec)
);
// Connect the socket
$result = @socket_connect($this->sock, $this->host, $this->port);
if ($result === false) {
@@ -169,19 +179,21 @@ class ModbusMaster
$writesocks = null;
$exceptsocks = null;
$rec = "";
$lastAccess = time();
while (socket_select($readsocks, $writesocks, $exceptsocks, 0, 300000) !== false) {
$this->status .= "Wait data ... \n";
$timeoutInSeconds = $this->timeout_sec + ($this->timeout_usec / 1000000);
$lastAccess = microtime(true);
while (socket_select($readsocks, $writesocks, $exceptsocks, 0, $this->socket_read_timeout_usec) !== false) {
$this->status .= "Wait data ... " . PHP_EOL;
if (in_array($this->sock, $readsocks)) {
while (@socket_recv($this->sock, $rec, 2000, 0)) {
$this->status .= "Data received\n";
$this->status .= "Data received" . PHP_EOL;
return $rec;
}
$lastAccess = time();
$lastAccess = microtime(true);
} else {
if (time() - $lastAccess >= $this->timeout_sec) {
$usecSpentWaiting = microtime(true) - $lastAccess;
if ($usecSpentWaiting >= $timeoutInSeconds) {
throw new Exception("Watchdog time expired [ " .
$this->timeout_sec . " sec]!!! Connection to " .
$timeoutInSeconds . " sec]!!! Connection to " .
$this->host . " is not established.");
}
}