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Questions tagged [at-commands]

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

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AT Commands for SARA-R510M8S (SARA-R5 evaluation kit)

I am using the SARA-R5 development board, specifically the SARA-R510M8S model (LTE + GNSS), with an Arduino Nano Every. My goal is to determine the GPS position and send its location via SMS, aiming ...
Aleat's user avatar
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GSM and LTE-M connection with SIM7070G for MQTT data transmission

I am working on a tracker project using the SIM7070G modem from SIMCOM. The objective is to maximize the connection by working with both LTE-M and GSM, aiming to send location data via MQTT. I have ...
Santiago Mercante's user avatar
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Why does a PB-02 ignore a "AT+NAME=abc123"?

When I connect to a PB-02 via UART(8data bits, no parity, 1 stop bit) it does not execute all AT commands. These work fine: AT\r\n results in ...
RRIDDICC's user avatar
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SIM7080G MFF2 SIM not detected

I have designed and assembled a custom PCB with ESP32 and SIM7080G LTE-M modem, basically an IoT weather station. SIM7080G datasheet Everything works fine except for a very important part that renders ...
Reicken Back's user avatar
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Managing AT Commands for SIM COM A7672S SIM Module - Header Appending Issue

I'm currently working with the SIM COM A7672S SIM module to download a file in chunks from an Amazon S3 server. I am using the AT command 'AT+HTTPPARA="USERDATA","Range: bytes=0-1023&...
cyber122010's user avatar
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RF verification for SIMCOM7070 modem

We have a custom board featuring a SIM7070 modem with two SMA connectors for GSM and GPS. After fabrication, the boards are passed through some basic tests to check if the device can operate as ...
BvLeeuwen's user avatar
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Using HM-10 module vs CC2540/1

Currently I'm trying to buy a BLE module, and the HM-10 module seems to be a module built around the CC2540 or CC2541 chips. The HM-10 module is a module that works whit UART and AT-commands, I want ...
Electromosaw's user avatar
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How can I make a basic BlueTooth communication between a cellphone and MXCHIP EMC3080-P module?

I'm trying to use the EMC3080-P module from MXCHIP, because it's used in some applications from ST, the company where I had the microcontroller I'm using (for example, the B-U585I-IOT02A discovery kit ...
santiago deliotte's user avatar
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Why am I getting incomplete geolocation data for long periods of time using SIM7070g?

I'm facing a problem while working on a tracking application using the SIM7070G module for GNSS data. The application alternates between sending data and retrieving GNSS coordinates due to SIM7070G ...
Santiago Mercante's user avatar
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532 views

How to connect two ESP32 via built-in Bluetooth?

I want to connect two ESP32 dev boards via their built-in Bluetooth to share data between them. (e.g. a remote control car and a controller) I used to connect two HC-05 Bluetooth modules with the help ...
Yiming Designer's user avatar
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AT COMMAND's GC433-TC016 No Response

My question consurns AT Commands using a Serial Port Wireless Device. ( SILICONRA - microchip ) GC433-TC016. I can transmit and receive Serial Port transmissions to Remote units. ( GC433-TC016) I ...
user66377's user avatar
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Why can't ESP32 read all of serial incoming data?

I am trying to change configration settings of E70 LoRa module. It works with AT commands. Everything is working normally, but I can't read all incoming data; after the "09:25:01.008 -> TFOCFG ...
mehmet's user avatar
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2 votes
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SIM900A: Network depersonalization required

I have made experience with sim 800l, it works like a charm. Now I got a new SIM900A module, interferencing it with (RP over python), AT command returns ok, and other basic AT commands, so not the ...
Erkman's user avatar
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SIM808 emits random numbers

I am programing a Maduino M0 board with a SIM808 GSM/GPRS/GPS module on it using the Arduino IDE. Periodically, after reprogramming the board a few times, the SIM808 no longer responds to any serial ...
SharpCarel's user avatar
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Problem with GPS old location [closed]

I wrote a GPS driver which sends and reads AT commands. I send the AT+CGPS=1,1 command to get the GPS location and if there is no answer I send ...
aguero's user avatar
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AT+ROLE = 1 is not working in hc-06

I'm try to study master - slave by using aduino with hc-06. I checked AT command is working ( ex) AT -> "ok" , AT+NAME ... ) I tried to use command AT+ROLE = 1 but it is not working. (...
둘기비's user avatar
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AT+CNBP command for SIM8202G-M2 cellular module

I've been trying to setup this module on CM4 rasberry device. So far I managed to get it setup to boot with the system, the main issue here it only finds LTE network. I used AT commands in order to ...
Wild Star's user avatar
2 votes
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84 views

ESP-WROOM-02 is not responding to AT commands as expected

I using the ESP-WROOM-02 (esp8266 core) as WIFI module and the Arduino nano IOT 33 (samd21g18) as main processing unit. I flashed the ESP-WROOM-02 via the ESP flash download tool with the AT Firmware ...
bmalbusca's user avatar
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SIM800L sends back the same AT command String that was sent to it from ESP32

My objective is to send the command AT to the SIM800L board and receive an OK. The problem is the data being received through the serial is exactly the same that was sent to the SIM800L module: the ...
elpegot's user avatar
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How to send message in websocket connected to my server from Quectel EC20 through AT Commands?

I made a Websocket connection from Quectel EC20 after opening TCP connection by giving IP and PORT and after that I sent GET req where header upgrade to websocket through AT Commands but I am not able ...
Sushant Verma's user avatar
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1 answer
200 views

Are there regional constraints with the SIMCom modules? (Eg. SIM7605CE/SIM7600CE)

I recently received a SIMCom Module (Model no. SIM7605CE), shown below. The item can be (purchased online as well). The device, much like the ones used with Arduinos (like the SIM800L), is supposed ...
C Vith's user avatar
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2 answers
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CANBUS Masking and Filtering

I am using a module to convert CAN to UART. This module has 2 programmable masks and 6 programmable filters. There are 13 message IDs that come in over the CAN bus and I only want 9 of them. The IDs ...
Adam's user avatar
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309 views

SIM 7600ei AT command error while sending GET request

I am using the SIM7600ei module with a 4g LTE Sim. I am successfully able to get the IP address. ...
Nitesh Singh's user avatar
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432 views

AT commands no answers ! SIM808 and Arduino

I will try to explain my problem... I'm using a SIM808 GSM-GPS click module and a ARDUINO nano 33 IoT board, I'm sending the command "AT\r" thanks to the TX port from the ARDUINO board to ...
Cpt-Gogo's user avatar
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1 answer
241 views

Why does the Atmega328 USART get trapped in a loop?

I have an Atmega328 micrprocessor. I connected its RX/TX pins to an SIM808 module and uploaded this code to the processor to communicate with it and send commands: ...
malloc's user avatar
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1 answer
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SIM800l keeps disconnecting after I send at+sapbr =1,1

I have confirmed my SIM card has data and can connect to the internet on my smartphone. The SIM800l also is fed with enough power and the LED does blink every three seconds. I set up my SIM800l module ...
JoeyB's user avatar
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1 answer
329 views

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 - ...
Kavya's user avatar
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1 answer
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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 ...
abomin3v3l's user avatar
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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 ...
ansonl's user avatar
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1 vote
3 answers
584 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, ...
Joe's user avatar
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1 answer
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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 ...
mcv's user avatar
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450 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 ...
BetaEngineer's user avatar
3 votes
1 answer
364 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 ...
hood's user avatar
  • 95
1 vote
1 answer
154 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 ...
a.yazdekhasti's user avatar
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1 answer
3k 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 ...
user avatar
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1 answer
305 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 ...
Ricardo Goncalves's user avatar
5 votes
1 answer
2k 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 "...
skot9000's user avatar
  • 113
1 vote
1 answer
183 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 ...
Ali Sam's user avatar
  • 11
0 votes
2 answers
211 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 ...
macdonaldtomw's user avatar
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2 answers
445 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 ...
skot9000's user avatar
  • 113
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1k 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 < ...
Karzon's user avatar
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680 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). ...
Zeta.Investigator's user avatar
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1 answer
1k 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 ...
R. Tyma's user avatar
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2 answers
2k 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'...
Electronic Brat's user avatar
3 votes
1 answer
15k 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 ...
NoonanRosenblum's user avatar
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1 answer
758 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'...
Kalarav Parmar's user avatar
1 vote
2 answers
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 ...
Joel Wigton's user avatar
  • 1,136
0 votes
1 answer
200 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 ...
wouterds's user avatar
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0 votes
1 answer
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 ...
cyborgdragon's user avatar
1 vote
1 answer
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 ...
Yahya Yahyaoui's user avatar