SMS text via DWR-921 4G LTE Router

[gtsamis]

Hello,
Has anyone tryied to use the Dlink DWR-921 4G LTE Router as SMS gateway for LM?
It only has a web interface and i haven't being able to find any API.

[admin]

Sending SMS should be possible via a HTTP request from LM. You just need to know the correct URL and GET/POST variables. You can view the full request in your browser developer tools by pressing F12 and switching to Network tab.

[gtsamis]

I am a bit stuck here 

I have managed to trace the login and send sms URLs but I can't replicate them outside the routers web interface.

Is seems to authenticate with the login URL but when i post the send sms URL i got the OK reply but the message never sends.
I have attached the HTTP posts/replies from routers web interface that used in order to login and send a test sms.

Line 243
GET http://192.168.16.1/log/in?un=admin&pw=password&rd=%2Fuir%2Fstatus.htm&rd2=%2Fuir%2Fwanst.htm&Nrd=1

Line 442 
GET http://192.168.16.1/smsmsg.htm?Nsend=1&N...&S801E2700=6979555555&S801E2800=Test%20send%20sms

Any help would be much appreciated.

[admin]

Have you tried sending these requests from your browser or from LM?

[gtsamis]

Have you tried sending these requests from your browser or from LM?

First off all i figure out that it needs a third post in order to send the sms (GET http://192.168.16.1/sms2.htm?Ncmd=2) 
I have tested it from several browsers and from LM and it works just for the first time.
I think it has to do with cookies... 

On my http sniffer i get some changes everytime i login on routers web interface. The header has a definition "cookies" (AMSESSIONID) that changes in every session.
Now I think i need a way to grab that AMSESSIONID and use it on further requests.

Code:

Accept: */*
Accept-Encoding: gzip, deflate, sdch
Accept-Language: en-US,en;q=0.8,el;q=0.6
Cookie: ID=AMIT0000; AMSESSIONID=7737225
DNT: 1
User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/45.0.2454.101 Safari/537.36

Code:

Accept: */*
Accept-Encoding: gzip, deflate, sdch
Accept-Language: en-US,en;q=0.8,el;q=0.6
Cookie: ID=AMIT0000; AMSESSIONID=8449948
DNT: 1
User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/45.0.2454.101 Safari/537.36

[admin]

Your first request to login URL should look like this:

Code:

res, code, hdr = socket.http.request('http://...')
if hdr['set-cookie'] then
  cookie = hdr['set-cookie']:split(';')[ 1 ]
end

All further requests must pass the cookie received from the first request:

Code:

res = socket.http.request({
  url = 'http://...',
  headers = {
    Cookie = cookie
  }
})