PIONEERPOS AT Commands G24-LC - Manual (Page 36)

Improved OEM Features
1-6 G24-L AT Commands Reference Manual April 15, 2008
2. The G24-L opens a TCP/IP stack as one of its "sockets" (it must know the target’s IP address
and port number).
3. Once the connection is established, data is transferred freely in both directions (upload and
download).
Connection with another G24-L using the "GPRS Manager"
The following occurs when creating a TCP/IP connection with another G24-L using the "GPRS
Manager":
1. The OEM on the target side (server) uses the "GPRS Manager" application. When using this
application the TCP/IP is external to the OEM. (External TCP stack is used).
2. The target side activates the "server application" (The term "server application" means an
application that has the ability to listen on a given IP address and port number).
3. After connecting to the GPRS network, the "server" sends its IP address to the G24-L using
an alternative connection (for example, CSD, SMS and so on).
4. The server application listens on a known port, waiting for G24-L to connect.
5. The G24-L connects to the same GPRS network as the server, and receives an IP address
(using the +MIPCALL command).
6. The G24-L initiates a TCP/IP connection with the listening "server". (It knows the IP
address and port number of the server).
7. Once the server is connected, the TCP/IP connection is created and data can be transferred
freely in both directions (upload and download).
UDP/IP
The set of AT commands created for the TCP/IP connection is used for the UDP/IP connection as
well. Therefore, UDP/IP must open a UDP stack using the MIPOPEN AT command. The
connection created does not change any concept regarding the
UDP/IP known protocol (which is connectionless), this is just an easy way for the terminal to
specify to the G24-L which of the four possible stacks should be used.
When establishing the UDP/IP connection, the G24-L is both the "initiator" and the "listener".
Creating UDP/IP Connections
Connection with another G24
The following occurs during a UDP/IP connection with another G24:
1. Side A:
– The G24-L connects to the GPRS network and receives an IP address (using the
+MIPCALL command).
– The G24-L opens a UDP/IP stack as one of its "sockets" (using the +MIPOPEN and
selecting the protocol UDP).
2. Side B:
– The G24-L connects to the GPRS network and receives an IP address (using the
+MIPCALL command).
– The G24-L opens a UDP/IP stack as one of its "sockets" (using the +MIPOPEN and
selecting the protocol UDP).