Motorola C370 ユーザーズマニュアル

6
Network API

- boolean timeout –

An optional third parameter, protocol may throw an

IOException when it detects a time-out condition.

The time-out period for the TCP implementation on the Motorola C370, C450, and C550

series of handsets is 20 seconds on read operation and about 45 seconds on write
operation if the time-out flag is set to true. If the time-out flag is set to false, the time-out
time is indefinite. The lingering time for closing sockets is 0 second (if the socket closed

by the server the lingering time will be less than 100 ms). If a new socket is requested
within this time frame and the maximum number of sockets opened has been reached (5

sockets), then an IOException is thrown.
Applications requesting a network resource for any protocol must use one of the three

methods above. The URL is the distinguishing argument that determines the difference
between HTTP, etc. The following chart details the prefixes that should be used for the
supported protocols.

Protocol

URL Format

HTTP

http://

TCP Sockets

socket://

UDP Sockets

datagram://

HTTP

The HTTP implementation follows the MIDP 1.0 standard. The

Connector.open()

methods return a

HttpConnection

object that is then used to open streams for

reading and writing. The following is a code example to show implementation of HTTP:

HttpConnection hc = (HttpConnection)Connector.open(
“http://www.motorola.com”);

In this particular example, the standard port 80 is used, but this parameter can be

specified as shown in the following example:

HttpConnection hc = (HttpConnection)Connector.open(
“http://www.motorola.com:8080”);

The other static Connector methods work in the same manner, but they provide the
application additional control in dealing with the properties of the connection. By default,

HTTP 1.1 persistency is used to increase efficiency while requesting multiple pieces of
data from the same server. In order to disable persistency, set the “Connection” property

of the HTTP header to “close”.