Metrologic Optimus R, Programming Manual

Page: 185 / 241

Chapter 3 Terminal Specific Function Library 179
b) Before receiving data from the network, call socket_hasdata() to check if there is
data in the buffer. Then, call Nread() to receive data on the network.
Note: In case of an abnormal break during PPP or DUN-GPRS connection,
CheckNetStatus(NET_IPReady) will return -1.
Refer to the Supplemental Functions section for other useful functions.
Close a Connection:
Call Nclose() to terminate a particular connection, i.e. conno returned by Nopen() ,
when the application program does not use it any more.
Termination of Networking Protocol Stack & Wireless Module:
When the application program wishes to stop using the network, call NetClose() to
terminate networking and shut down the power to the module so that it can save
power. To enable the network again, it is necessary to call
NetInit() again.
Note: After calling NetClose(), any previous network connection and data will be lost.