Operating system name and version: Arch Linux ARM 3.13.7-1-ARCH
Version of smsd: 3.1.15
Smsd installed from: AUR - https://aur.archlinux.org/packages/smstools3/
Name and model of a modem / phone: Huawei U2801
Interface: USB

I have a message that has a UDH for Application Port Addressing. Everything works as expected except I get a linefeed added to the end of my message. Is there some way to remove the linefeed?

The message:
To: 1234561234 To_TOA: National Alphabet: GSM UDH: true UDH-DATA: 06 05 04 15 79 00 00 Does this message have a linefeed?

The PDU generated:
0051000AA121436521430000FF2B06050415790000C477790EA2A3D37350BB3C9F87CF65103A6C2F83C22076DA5D3697CBE49F02

I found that by truncating the file by 1 byte, the linefeed is removed. Looks like the 'sendsms' script uses 'echo -n' to get around this.