48 lines
1.7 KiB
Nix
48 lines
1.7 KiB
Nix
{
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liminix
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, usb-modeswitch
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, ppp
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, lib
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, svc
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}:
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{ apn, username, password, authType }:
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let
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inherit (liminix.services) oneshot;
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authTypeNum = if authType == "pap" then "1" else "2";
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chat = lib.escapeShellArgs [
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# Your usb modem thing might present as a tty that you run PPP
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# over, or as a network device ("ndis" or "ncm"). The latter
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# kind is to be preferred, at least in principle, because it's
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# faster. This initialization sequence works for the Huawei
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# E3372, and took much swearing: the error messages are *awful*
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"" "AT"
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"OK" "ATZ"
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# create PDP context
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"OK" "AT+CGDCONT=1,\"IP\",\"${apn}\""
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# activate PDP context
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"OK" "AT+CGACT=1,1"
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# setup username and password per requirements of sim provider.
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# (caret is special to chat, so needs escaping in AT commands)
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"OK" "AT\\^AUTHDATA=1,${authTypeNum},\"\",\"${password}\",\"${username}\""
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# start the thing (I am choosing to read this as "NDIS DialUP")
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"OK" "AT\\^NDISDUP=1,1"
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];
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modemConfig = oneshot {
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name = "modem-configure";
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# this is currently only going to work if there is one
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# modem only plugged in, it is plugged in already at boot,
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# and nothing else is providing a USB tty.
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# https://stackoverflow.com/questions/5477882/how-to-i-detect-whether-a-tty-belonging-to-a-gsm-3g-modem-is-a-data-or-control-p
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up = ''
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sleep 2
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${usb-modeswitch}/bin/usb_modeswitch -v 12d1 -p 14fe --huawei-new-mode
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sleep 5
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${ppp}/bin/chat -s -v ${chat} 0<>/dev/ttyUSB0 1>&0
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'';
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down = "chat -v '' ATZ OK </dev/ttyUSB0 >&0";
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};
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in svc.network.link.build {
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ifname = "wwan0";
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dependencies = [ modemConfig ];
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}
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