Questions tagged [at-commands]

AT commands are used to control MODEMs, such as GSM/GPRS/bluetooth modules.

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GSM SIM800C not responding

I'm using Arduino IDE software Arduino Uno board GSM SIM800C BSNL 4g SIM card Interfacing RX (of GSM) to PIN 2 (of Arduino) TX (of GSM) to PIN 3 (of Arduino) GND to GND Power supply For Arduino - ...
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27 views

AT command not sending

I am trying to receive a report, however it return the following report. Do you guys have an insight what this issue maybe be? The first report is sent fine, but the second never does. Thank you <...
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1answer
32 views

ESP8266 / ESP-01 - Customize the NonOS “at” firmware of SDK?

I am using an ESP-01 this way: MCU <-> UART <-> ESP-01, using AT firmware/NonOS on ESP-01. I have my own encryption functions, and I would like to implement them both on MCU and ESP-01 sides at ...
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31 views

What does “Power Off OOL” AT command mean for a Bluetooth module?

I am reading the datasheet for the OVC3860 Bluetooth module and one of the AT commands is 4.50 Power Off OOL #VX. The description from page 21 of the datasheet is below. [] What does OOL mean in ...
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68 views

sim800 - TCP GPRS slow socket opening

I'm trying to create an internet interface for my AVR project using a SIM800 module, which I use to open a socket to my server. My only problem is that bringing up TCP takes lots of time. The other ...
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3answers
80 views

Bluetooth HC-05 AT Commands

I'm attempting to put an HC-05 module into command mode in order to change the PIN and default baud rate etc. According to the datasheet, PIO11 needs to be high to do this, so I connect it to 3.3v, ...
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1answer
334 views

What is single and multi connection mode( AT+CIPMUX=0 or 1) in esp8266 AT commands

I was studying the AT commands to program atmega328p for the communication with esp8266. Now I am confused with the command AT+CIPMUX=0 or 1 , it explains that 1 for multiple connection, 0 for single ...
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217 views

How does GSM Module store incoming SMS in its “SM” or “ME” memory?

I am using AI Thinker A7 GSM/GPRS/GPS Module demo v7.1.(The Rx, TX, GND pins of this module are connected to tx, rx, gnd pins of the prolific Rs232-TTL converter and a virtual com port is open in ...
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1answer
99 views

What are AT commands ? When to use them?

I read some articles about the AT commands but I am still unable to understand something. As the article says "AT commands are instructions used to control a modem." I used a while ago an Bluetooth ...
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1answer
108 views

SIMCom SIM808 SD card problem

I am working with SIMCom's SIM808 2G+GPS modem and trying to connect it to an SD card. I am following SIMCom hardware design docs, to save some data in SD memory. The problem is: when I send ...
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1answer
1k views

UART - Writing and reading AT commands

I am working with a B-L072Z-LRWAN1 board and a 8pya00-simcom-evb v1.02 board with SIM7000E. This SIM module operates through AT commands and I need to send these commands through an UART connected ...
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177 views

How can I read/write bytes to SD card slot of MC60A?

I am working on a clickBoard with MC60 A GSM module from MikroEletronika company. This clickBoard has two slots: (1) one for SIM card and another (2) for micro SD cards. I have read all the available ...
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1answer
957 views

SIM808 registration denied for new SIMs

I have a SIMCom SIM808 2G GSM module on a custom PCB based upon the Adafruit FONA. I got a bunch of 2G SIM cards from Aeris.net. The problem is when I first put the SIM cards in my device, I get "...
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1answer
145 views

how to send inter-operator sms via GSM/LTE module

I am using a GSM/LTE module (EC21 Quectel) to send and recieve sms with HyperTerminal application on computer by at-commands. I can send sms to devices with the same operator (intra-operator), but ...
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2answers
70 views

Force cellular modem to transmit at maximum power [duplicate]

I want to force my cellular modem to transmit at maximum power so that I can see if that is the cause of microSD card crashes that I have been experiencing in an embedded application. My modem is a ...
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280 views

SIM808 always returns the same temperature

I have a SIMCom SIM808 module built up on my own breakout board. Whenever I query the temperature I get back the exact same temperature, 24.11 (deg C) despite the actual temperature in the room ...
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841 views

Enabling SD card access on SIM808

I am currently working with SIMCom's SIM808 2G+GPS modem. In my setup, an MCU communicates with the modem over UART to save some data in the SIM808's filesystem. As the modem's built-in memory is < ...
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368 views

Problem in connecting to a server waiting for a TCP request using ESP8266

I'm using ESP8266 for connecting to a appspot-preview.l.google.com server which listens for TCP request and answers back a number (it's for training purposes). ...
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845 views

How to connect (pair) two CC41-A module

I bought two CC41-A BT modules. First I want to buy HM10 modules. I wonder if I can connect this two CC41-A to send and read data wirelessly. I look in datasheet but I cant find suitable AT command (I ...
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2answers
1k views

SIM800L - No response while sending AT commands

I'm new to this arduino world. I'm trying to communicate with my arduino nano and SIM800L. I read few things in the internet and found a basic code. I tried copying it and tried to work it out, but I'...
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1answer
9k views

SIM800L not responding to AT commands

I am on a very exciting project, by the SIM800L module is resisting hard ! The hardware : clone arduino nano (dx.com) SIM800L module + antenna (dx.com) Lipo battery 3.7V 150mAh (letmeknow.com) The ...
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1answer
623 views

Issue of data posting in GSM over the GPRS from when use Different service provider

I'm using Telit's HE910 GSM Modem To Post The data on web-server. so i'm using different company service provider SIM Card to test the data posting from different service provider. In this case when i'...
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2answers
4k views

Testing a connection to a TCP socket through SIM5320A cellular module

I'm using a SIMCOM 5320A module like this one to try to establish a TCP connection. I'm going through SIMCOM's application note on TCP/IP as a reference. The AT commands I'm using may very well be ...
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1answer
173 views

SIM900 SMS timestamps are not accurate enough

I'm experimenting a bit with a SIM900 module and a Raspberry Pi. I can communicate with it and receive/send SMS messages. However, there's a problem when a message that exceeds the 160 character limit ...
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1answer
4k views

How do I send data over TCP from a SIM5320A?

NOTE: I have been using this as a reference. After recently purchasing a SIM5320A breakout board (the board) I have been trying to connect it to a TCP server. After having to connect the board to an ...
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1answer
2k views

AT-Commands: Send E-mail with attachment

I purchased a telit GSM Click (GL865) to use in my project. The architecture is composed of PIC based board with two MikroBUS connectors, I used one for the Telit GSM click, and the second one for the ...
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404 views

Error sending SMS to SIM900 in PIC

I am trying to interface SIM900 with PIC18F2520. I need to send SMS to a particular cell number. According to AT commands, ...
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1answer
2k views

Uncertainity with CIPSEND command to updating the data field on thingspeak using esp8266

I am having a bit of uncertainty here updating data on thingspeak using their generated API or may be because of the "AT+CIPSEND" command. Below are steps I followed for the 1st trial: ...
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2answers
378 views

Fetching network time from simcon 800c gsm module [closed]

Is there any way to fetch the current time from the 800c GSM module. I tried the following commands: AT+CENG=2 AT+CLTS=1 AT+CCLK? Output: ...
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1answer
562 views

Cell broad cast messages command not working in SIM 800C

I am using SIMCom 800C module to get the location through cell broadcast messages. When I am executing command AT+CSCB=0,\"50\",\"0-9" , I get the response '...
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2answers
14k views

Posting to php server using SIM900 GPRS with AT commands

I am using a SIMCOM SIM900 GSM/GPRS module in an embedded hardware application. Rather than sending device data to a server by SMS (what I've been doing so far) I want to switch and start using GPRS ...
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1answer
255 views

How to use hc-05 with pic32

I want to use Hc-05 bluetooth module with my pic32 controller for communicating with other bluetooth devices. I want to test the hc-05 module with my pic32 controller. I have made the hardware ...
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1answer
6k views

What does the GSM AT+CSQ command output signify?

So the command returns the received signal strength(RSSI) and bit error rate(BER). I see that the RSSI is obtained even if the SIM card is not inserted in the GSM module. So what does RSSI signify? ...
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1answer
3k views

SIM800 - HTTP Get request time out

I've been working on a weather station project, and I used a SIM 900 module to upload the data to a web server. Recently I started using a SIM800-DS for the same purpose and I had to rewrite the code ...
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1answer
442 views

Check GSM Module Status

I tried to send "AT" command via UART at some baudrate to my Cinterion BGS2T, and I am always getting response "ERROR". I get error on every AT command. How can I know what is wrong, or how to check ...
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2answers
3k views

AT+CSQ without Disconnecting PPP Connection in ARCH Linux

I have a Telit GL865 GSM/GPRS module which is connected to a SBC (running ARCH Linux.) via Serial Port. For GPRS connection, PPP connection as indicaten on this page. I want to read Cell Tower Signal ...
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2answers
608 views

AT commands for GSM

I'am trying to interface a GSM module with flowcode for PIC and the Tutorial I'am following suggests a module SmartGM862 which is not available in my market but instead some other SIM900 series module ...
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2answers
10k views

HC-05 Bluetooth AT+INQ command not working

I have followed the directions from the site below for bluetooth comm between an Arduino board using the HC-05 and an smartphone. It works fine. The problem is that I need to measure the RSSI from my ...
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1answer
4k views

AT+CIPSEND problem with ESP8266

Here I am facing an issue with ESP8266 CLIENT Programming. The Problem is with AT+CIPSEND Command. This command is working for few times, but after few cycles, it waits too long for "SEND OK". I have ...
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1answer
3k views

AT Commands to transmit data through TCP/IP stack with LTE network

I need to design an embedded sotfware that will drive a LTE cellular device (like u-Blox TOBY L2 Series) and its TCP/IP stack to transmit some data toward a distant server. I'm waiting for the device ...
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2answers
2k views

GPRS HTTP 400 Bad request

I am facing some problem with GPRS Project. I am sending request to server through GPRS and receiving responce from the server. I have used AVR ATmega32 micro controller and SIM900 GSM/GPRS Module ...
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3answers
2k views

SIM908 GPS STATUS “Location Unknown” Error

I'm using a SIM908 module on a custom board and am having trouble getting the GPS location from it. Everything else works on the module. I can send SMS, make calls and send and receive data from a ...
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2answers
3k views

Is it possible to send AT commands through TCP?

I have a SIM900 GSM/GPRS device, I can send AT commands through HyperTerminal and everything is fine. I can configure GPRS connection through AT commands: ...
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1answer
5k views

How to interface GSM with 8051 microcontroller to send SMS?

I am doing a project on SMS sending through GSM using SIM 900 module and 8051. My code is: ...
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1answer
2k views

Quectel m66 bluetooth usage?

I've been working on m66 and got it connected to PC via usb to serial converter, and got it up and running. AT command replies with ...
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2answers
6k views

ESP8266 Wifi Module - prints “ready” but not responding to AT commands

Just received my first ESP8266 wifi module with some excitement. However I've been unable to fully communicate with it. I have connected the module to my computer via a usb to serial cable and I'm ...
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2k views

Why AT command set?

Frankly, Why do all communication ICs(or at least many of them or most famous or popular) such as Bluetooth or WIFI or GSM or etc support AT command set? why don't they have a simple pin for D/C(Data ...
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1answer
15k views

GSM Modem will not register to network

After getting two modems (dev boards) Siemens TC35 and SIM900A I cannot get them to send SMS. From the research it seems that somehow SIM cards will not register to network. I bought three SIM cards ...
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1answer
759 views

SIM900 and Phone Numbers

How do I add a phone number to the SIM900? Can I add a phone number to the SIM900? Assuming I can, would I send the phone number through the AT Commands or the actual SIM card? I don't know how to ...
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1answer
846 views

hlk-m30 WebClient example

I have started working on HLK-m30 WiFi module. I am developing the simple client on the module using simple AT commands. I have Opened socket TCP client and then Write data using the command. ...