Hi, I created next small LuCI app.
Luci-app-sms-tool is a mini gui for handling messages via sms_tool application/project https://eko.one.pl/?p=openwrt-sms_tool Works with mPCI-E and USB 3G/LTE modems. Don't work with HiLink/RNDIS modems.
I'm making it available and maybe it'll come in handy.
That's a very useful feature! Thanks for your great work 
Nice, dude!
I used to text from my router to my phone in the old days...
At the time, I just used an email utility built into DD-WRT (sendmail I think it was) and my service providers SMTP server. I'd email phone#@tmomail.net and it'd show up on my phone as an MMS. Maybe you could build this into it? I think there may be a sendmail version supporting SSL/TLS (think Hotmail, GMail, etc...) but it's pretty bloated size wise. Just an idea.