It looks like you put in dynamic connection information without putting in a domain name to use for the alternate connection.
I think you can just delete the alternate connection code and use:
<?php
# FileName="WADYN_MYSQLI_CONN.htm"
# Type="MYSQL"
# HTTP="true"
$hostname_MyDevDB = "localhost";
$database_MyDevDB = "mydevices";
$username_MyDevDB = "paulc";
$password_MyDevDB = "pE8/AOzpL(";
@session_start();
$MyDevDB = mysqli_init();
if (defined("MYSQLI_OPT_INT_AND_FLOAT_NATIVE")) $MyDevDB->options(MYSQLI_OPT_INT_AND_FLOAT_NATIVE, TRUE);
$MyDevDB->real_connect($hostname_MyDevDB, $username_MyDevDB, $password_MyDevDB, $database_MyDevDB) or die("Connect Error: " . mysqli_connect_error());
?>