TPDU library.

[moteus]

Did you see my lua-tpdu library.
It low-level encoder/decoder wich also support multi-part sms.
It does not provide any object just encode/decode from/to Lua table.

This library was written to lluv-gsmmodem library.

[0x4C4A]

Gosh, no, I completely missed that one.
Yours seems to be missing UTF-16bit encoding, which is at least something I haven't pointlessly duplicated. :)
Can I contact you on some more IM style network to discuss the library a bit?

[moteus]

sms does not use utf-16. it uses ucs2. lua-tpdu does not do any conversions it just return binary string and encoding. lluv-gsmmodem uses iconv library to convert text.

[0x4C4A]

Indeed, a bit of oversight on my part.
In fact, the lluv-gsmmodem library seems like what I'd need, however it drags in a whole load of dependancies which is not really what I'd want (need this on an embedded Linux machine). Any tips?

[moteus]

You can try use at.lua module. It provides AT commands protocol.
This is link for test
You need create ATStream object and implement on_command callback to write raw data to serial port. When you read data from serial port you need call stream:append(data) and to execute callbacks you need call stream:execute()
Commands implemented in ATCommand class.

stream  = at.Stream(SELF)
stream:on_command(function(self, cmd)
  -- write cmd to serial port
end)

command = at.Commander(stream)

-- proceed URC data (sms, call, boot)
command:on_urc(function(self, err, ....) ... end)

-- execute command
command:ATZ(function(self, err, res) ... end)

-- proceed data from port
data = read_from_sereal_port()
stream:append(data)
stream:execute()