Questions tagged [at-commands]

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

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2answers
29 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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1answer
85 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
778 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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0answers
29 views

How do you get the call ringing response after sending ATD from gsm module?

I have a gsm module. I want to know which AT command can tell me if the target phone is ringing or not. I want to count time between start of ringing and user response Example: atd12345 ...
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0answers
384 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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0answers
124 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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0answers
601 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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0answers
254 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). ...