Also controlled via [modem] CallerID key in svdm.ini fiile.
Reports the connected IP address between the first and second RING result.
Required a fix to reset the ringcount to 0 upon new connection.

Simplified the AT command parsing logic a bit.

This sets the stage for "Caller-ID" support and IP/host filtering (before
sending a "RING" result and requiring an auto-answer or host/BBS software to
send "ATA").

by default, client.ini in the current working directory.
Configurable filename via ClientFile key in the root section of svdm.ini.

Added undocumented experimental options -I and -O to enable DOS input and output interception modes in sbbsexec (e.g. to be used possibly with '-h'). Also -M to specify sbbsexec mode value by number (e.g. 3 to enable DOS Input/Output redir).

Added '-n' option to specify node number (probably no real value/need).

Safe string formatting.

When listening, the address family cannot be PF_UNSPEC, so default to PF_INET (IPv4), when not specified.
Not sure why we're setting ai_flags to PF_UNSPEC (copied from syncterm) - that's just 0, but otherwise the PF_ and AI_ flags are not compatible.
Don't set the ai_flags to anything here since they don't seem to change the behavior.

Fix a corner case where an invalid command-mode escape sequence (e.g. "+.+.+") could've been interpreted as valid.

More case-insensitivity in parsing special "number" values (e.g. 'L' for last number).

Default to Telnet mode (not Raw TCP).
Default to unspecific address family (not IPv4).
Case-insensitive "-telnet" and "-raw" option recognition.

To (re)generate git_branch.h and git_hash.h every build

svdm -V and "ATi1" output.

To be more consistent with other Synchronet project and solution files.

Set sbbs_hungup event state correctly based on initial online state (i.e. FALSE if already connected/online).

Allow BusyNotice (string) to be configurable via .ini file.

Support specifying an additional or alternate .ini file to read using -c<fname> option.

Support [sockopts] (socket options) settings in ini file

CamelCase the ini key names

Build using WinXP-compatible toolset.

e.g. AT&W writes the current settings to the [modem] section.

First commit.

Right now it just connects/accepts-connections using raw TCP. As demonstrated in YouTube video:
https://www.youtube.com/watch?v=fxp38Nde3fg