001-0004-819 Rev01
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3.
After connecting to the CDMA 1x network, the "server" sends its IP address to the SMC
modem using an alternative connection (for example, CSD, SMS and so on).
4.
The server application listens on a known port, waiting for SMC modem to connect.
5.
The SMC MODEM connects to the same CDMA 1x network as the server, and receives an IP
address (using the +MIPCALL command).
6.
The SMC MODEM 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 C24 which of the four
possible stacks should be used.
When establishing the UDP/IP connection, the SMC modem is both the "initiator" and the "listener".
Creating UDP/IP Connections
The following occurs during a UDP/IP connection with another SMC modem:
1.
Side A:
– The SMC modem connects to the 1x network and receives an IP address (using the
+MIPCALL command).
– The SMC modem opens a UDP/IP stack as one of its "sockets" (using the +MIPOPEN and
selecting the protocol UDP).
2.
Side B:
– The SMC modem connects to the 1x network and receives an IP address (using the
+MIPCALL command).
– The SMC modem opens a UDP/IP stack as one of its "sockets" (using the +MIPOPEN and
selecting the protocol UDP).
3.
Side A and B previously agree on a port number, and exchange their given IP addresses via
other means of connection (SMS, CSD, Voice, DB and so on).
4.
The SMC modem sends and receives data to and from the targeted site as it knows the IP
address and port number of the target.
Summary of Contents for SMC-CDMA Series
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