Skip to main content
Home
for DLMS smart meters
Open source solutions for DLMS smart metering

Main navigation

  • Home
  • Products
  • About us
  • Open Source
  • Community
  • Forum
  • Downloads
User account menu
  • Log in

Breadcrumb

  1. Home
  2. Node
  3. Error When Opening a Connection

Error when opening a connection

Forum Rules

Before commenting read Forum rules

Don't comment the topic if you have a new question.

You can create a new topic selecting correct category from Gurux Forum and then create a new topic selecting "New Topic" from the top left.

By kobe , 22 August, 2017
Forums
Gurux.SMS

Hello,

Today I tried to find some code to control a sms modem of schneider electric, with at commands and c#. i tried to use this library but everytime I open the connection, the error "Pin is needed" is shown.

I had a look in the source code and it seems to be a problem in the code sheet GXSMS.cs, in the open method the program sends the AT command "AT+CPIN?\r" at line 1196. Then the modem replys with "+CPIN: READY", the code also waits to get this command but there is a problem there. The SendCommand method seems unable to give this as a reply, because there is no OK in this reply.

Is my modem not following an agreement, that states an OK is needed?
Is this maybe a bug in the code?
This seems critical to me, do other modems give a different reply?

Can someone have a look at this?
At the moment I have changed the code so the READY command is accepted without OK.

Kind regards.

Profile picture for user Kurumi

Kurumi

9 years ago

Error when opening a connection

Hi,

We tested this with few modems. All are returning OK at the end:
AT+CPIN?
+CPIN: READY
OK

Are you receiving \r\n after READY?
BR,

Mikko

  • Create new account
  • Reset your password

Hire Us!

Latest Releases

  • Wed, 08/26/2026 - 09:04
    Gurux.DLMS.Python 1.0.203
  • Mon, 08/17/2026 - 11:28
    Gurux.DLMS.Python 1.0.202
  • Mon, 08/17/2026 - 09:47
    gurux.dlms.cpp 9.0.2608.1701
  • Mon, 08/17/2026 - 09:25
    gurux.dlms.c 9.0.2608.1701
  • Mon, 07/27/2026 - 12:37
    gurux.dlms.cpp 9.0.2607.2701

New forum topics

  • Security vulnerability report — request for a private contact (GuruxDLMS.c / ANSI C)
  • Topic: Insufficient Memory Error When Reading Class 7 Profile Generic Objects
  • SN ReadResponse returns all-null values when response spans multiple HDLC frames
  • Gurux.Serial.Android 3.0.6 – CH340 (HL-340) USB-Serial Adapter Not Working,
  • Trying to talk to a L&G E360 meter (Using Python Gurux)
More

Who's new

  • cyby
  • Metin Onan
  • ssv007
  • 3nzol3dur
  • dw772
RSS feed
Privacy FAQ GXDN Issues Contact
Follow Gurux on Twitter Follow Gurux on Linkedin