C Programming; Open() - Multitech MultiConnect MTPCIE-H5 Series Developer's Manual

USING LINUX WITH H5 DEVICES
usepeerdns
defaultroute
noauth
Step 2. Use a text editor to create a chat script containing the lines in the example below. In this example [APN]
should be replaced with the APN assigned by your cellular provider. Save the file as /etc/chatscripts/MAT1-chat.
Example chat script:
ABORT "ERROR"
ABORT "NO CARRIER"
ABORT "BUSY"
"" at+cgdcont=1,"IP","[APN]"
OK atd*99***1#
CONNECT ""
Step 3. Use the following command line to start pppd:
pppd debug call MAT1-peer
This command line enables logging of debug information and tells pppd to use the peer file referenced by the call
option. After 20-30 seconds, type ifconfig and check whether a ppp interface is listed. If it is not, then check syslog
for pppd and chat events. Normally pppd/chat logging is written to /var/log/syslog (could vary depending on syslog
configuration).

C Programming

The following topics show all the functions that can be used from C source code to perform read/write operations
on the serial devices.

open()

The open() function shall establish the connection between a file and a file descriptor. The file descriptor is used by
other I/O functions to refer to that file.
Header File
fcntl.h
Prototype:
int open(const char *pathname, int flags)
Parameters:
pathname – file name with its own path.
flags – is an int specifying file opening mode: is one of O_RDONLY, O_WRONLY or O_RDWR which request opening
the file read-only, write-only or read/write, respectively.
Returns:
The new file descriptor fildes if successful, -1 otherwise.
Example
Open the /dev/ttyACM0.
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MultiConnect PCIe MTPCIE-H5/MTPCIE-BW Developer Guide