I really appreciate the suggestions so far with my socket client problem. Somebody suggested I repost the issue with the program flow and code, to clarify the situation (a good idea). So here it is:
To sumarrize: My socket client runs fine when all it does is (1) wait for data from the server (2) respond to server message (3) then wait again (ad infinitum). E.g.,
---THIS WORKS----------------------
Setup and open TCP socket
Send a Password_DS to the Server
Send a Resend_DS to the Server
Enter infinite loop:
Wait for messages from the Server
Upon receipt of a Send_DS from the Server
Respond with a Send_DS_Ack
Upon receipt of a Ping_DS from the Server
Respond with a Ping_DS_Ack
Upon receipt of a Status_DS from the Server
Respond with a Status_DS_Ack
---THIS WORKS----------------------Again, the client loops fine and works well—UNTIL I I try to add one feature: If the Server doesn't send a message for more than five seconds, the socket_read should send Ping_DS to the Server to see if it's still alive, and then, if it is, continue to the top of the loop and wait for another message from the Server.
---THIS DOESN'T WORK----------------------
Setup and open TCP socket
Send a Password_DS to the Server
Send a Resend_DS to the Server
Enter infinite loop:
Wait for messages from the Server
Upon receipt of a Send_DS from the Server
Respond with a Send_DS_Ack
Upon receipt of a Ping_DS from the Server
Respond with a Ping_DS_Ack
Upon receipt of a Status_DS from the Server
Respond with a Status_DS_Ack
-> Periodically, send a Ping_DS to the Server
-> If the Ping_DS transmit fails
-> Clean-up and restart the socket connection
-> If a Ping_DS_Ack is not received from the Server
-> Clean-up and restart the socket connection
---THIS DOESN'T WORK-------------------------PROGRAM OUTPUT---------------------- Socket created. Socket connected to 192.168.0.13:9500.
SERVER <- CLIENT: 18 (PASSWORD_DS) SERVER -> CLIENT: 19 (PASSWORD_DS_ACK)
SERVER <- CLIENT: 3 (RESEND_DS)
MESSAGE RECEIVED
SERVER -> CLIENT: 23 (STATUS_DS) SERVER <- CLIENT: 24 (STATUS_DS_ACK)
MESSAGE RECEIVED
SERVER -> CLIENT: 16 (RESEND_DS_ACK)
PHP Warning: socket_read() unable to read from socket [35]: Resource temporarily unavailable in /Users/rene/Sites/gpspolice/titan/cr.php on line 65
Warning: socket_read() unable to read from socket [35]: Resource temporarily unavailable in /Users/rene/Sites/gpspolice/titan/cr.php on line 65
PHP Warning: socket_read() unable to read from socket [35]: Resource temporarily unavailable in /Users/rene/Sites/gpspolice/titan/cr.php on line 65
Warning: socket_read() unable to read from socket [35]: Resource temporarily unavailable in /Users/rene/Sites/gpspolice/titan/cr.php on line 65
---PROGRAM OUTPUT----------------------
---MY CODE (WHICH DOESN'T WORK)----------------------
$msg_recv = 3;
$timeout = array('sec' => 5, 'usec' => 0);// ENTER LOOP
do {
$data = "";
socket_set_block($socket);
socket_set_option($socket,SOL_SOCKET,SO_RCVTIMEO,$timeout);
while(($buf = socket_read($socket,128,PHP_BINARY_READ)) !== false) {
$data .= $buf; if(preg_match("/ENX/",$data)) {
$msg_recv = 1;
break;
} elseif ($error = socket_last_error($socket)) {
$msg_recv = 0;
echo "\nTIMEOUT: SOCKET ERROR [$error]:" .
socket_strerror($error);
break;
}
}if ($msg_recv == 1) {
echo "\n\n\nMESSAGE RECEIVED\n";
// RECEIVED MESSAGE
$msg_type = get_msg_type($data);
recv_msg($msg_type);
// RESPONSE
switch ($msg_type) {
case 1: // SEND_DS -- PROCESS MESSAGE, RESPOND
$msg_body = get_msg_body($data);
send_msg("",$cn["SEND_DS_ACK"]);
break;
case 13: // PING_DS -- RESPOND
send_msg("",$cn["PING_DS_ACK"]);
break;
case 23: // STATUS_DS -- UP AND RUNNING -- RESPOND
send_msg("",$cn["STATUS_DS_ACK"]);
break;
case 16: // RESEND_DS_ACK -- DO NOTHING
break;
case 25: // DISCONNECT_DS -- ACKNOWLEDGE, CLOSE SOCKET, REOPEN
socket_close($socket);
$connection = false;
break;
}
$msg_recv = 3;
} elseif ($msg_recv == 0) { echo "\n\n\nTIMEOUT: MESSAGE NOT RECEIVED\n";
$msg_recv = 3;
}} while ($connection == true); ---MY CODE WHICH DOESN'T WORK----------------------
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