Opens a network interface and prepares it for use.
Must be called before any communication using the network interface can occur.
netOpen(iface := 1) is identical to gprsOpen(), and must be called after gsmPower.
Note that the connection to the network is not established when this function returns.
The netConnected() function will indicate when the connection to the network is established and ready for communication.
Input:
iface : SINT
The network interface to open. 1 = Cellular network, 2 = LAN network, etc. (See Network)
Returns: INT
0
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- Success.
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-1
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- Unsupported interface.
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-2
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- Interface is powered off.
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-3
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- Interface can not be opened at the selected CPU speed (see pmSetSpeed).
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-4
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- Interface is unable to connect because of the configuration.
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-5
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- Interface is not accessible. This may be because the cellular connection is using the highspeed link. See gsmPower().
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Declaration:
FUNCTION netOpen : INT;
VAR_INPUT
iface : SINT;
END_VAR;
Example:
INCLUDE rtcu.inc
VAR
netInfo : netGetInformation;
iface : SINT := _NET_IFACE_LAN1;
END_VAR;
FUNCTION printInfo
netInfo(iface:=iface);
DebugFmt(message:="Network interface \1:", v1 := iface);
DebugFmt(message:=" Status \1", v1 := netInfo.status);
IF netInfo.status > 1 THEN
DebugMsg(message:=" Phy addr " + netInfo.phy_addr);
IF netInfo.dhcp THEN
DebugMsg(message:=" Dynamic IP address");
ELSE
DebugMsg(message:=" Static IP address");
END_IF;
DebugMsg(message:=" IP addr " + sockIPToName(ip := netInfo.ip));
DebugMsg(message:=" Mask " + sockIPToName(ip := netInfo.subnetMask));
DebugMsg(message:=" Gateway " + sockIPToName(ip := netInfo.gateway));
IF netInfo.AutoDNS THEN
DebugMsg(message:=" Automatic DNS");
ELSE
DebugMsg(message:=" Manual DNS");
END_IF;
DebugMsg(message:=" DNS1 " + sockIPToName(ip := netInfo.DNS1));
DebugMsg(message:=" DNS2 " + sockIPToName(ip := netInfo.DNS2));
END_IF;
END_FUNCTION;
PROGRAM test;
VAR
rc : INT;
END_VAR;
IF iface = 1 THEN
gsmPower(power:=ON);
END_IF;
IF NOT netPresent(iface:=iface) THEN
DebugFmt(message:="Network interface \1 is not available", v1:=iface);
WHILE TRUE DO
Sleep(delay:=5000);
END_WHILE;
END_IF;
rc := netOpen(iface:=iface);
DebugFmt(message:="netOpen: \1", v1:=rc);
WHILE NOT netConnected(iface:=iface) DO
DebugMsg(message:="Waiting for network connection");
Sleep(delay:=2500);
END_WHILE;
printInfo();
BEGIN
END;
END_PROGRAM;
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