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10 votes
Accepted

Posting to php server using SIM900 GPRS with AT commands

After much googling and mashing together various answers, I got it working. Here's the AT command sequence. You can test this from start to finish, you'll just need to confirm the APN of the carrier ...
LShaver's user avatar
  • 871
6 votes

What AT command should be sent to modem to get time?

AT+CLTS=1 ( Get local time stamp ) AT&W ( Save configuration ) Turn off modem and turn on modem(reboot to get local time from network) Next time when modem boots up you should be able to get ...
Sumit Dubey's user avatar
4 votes
Accepted

SIM808 registration denied for new SIMs

I got some help from an Aeris engineer with this one. It turns out that when a SIM first registers with the network, it requires better signal quality than subsequent registrations. When the SIM has ...
skot9000's user avatar
  • 113
3 votes

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

By default, the ESP is in "single connection mode". This means that, at any time, there can only be one TCP connection. (UDP actually has no concept of a "connection", but the ESP still handles it ...
JimmyB's user avatar
  • 3,873
3 votes
Accepted

AT-Commands: Send E-mail with attachment

According to the manual, section 5.1.6.10.9. Send mail with attachment - #SMTPCL: AT#SMTPCL=<da>,<subj>,<att>[,<filename>,<encod>] ...
Dave Tweed's user avatar
  • 173k
3 votes
Accepted

SIM900 SMS timestamps are not accurate enough

As @PlasmaHH suggested, changing the text mode to PDU mode (using AT+CMGF=0) did give me some more information. The parsed PDU string now contains a property ...
wouterds's user avatar
  • 141
3 votes

AT+CSQ without Disconnecting PPP Connection in ARCH Linux

It is possible to issue AT commands whilst a PPP connection is live by setting up multiple multiplexed serial streams over a single physical serial port. The standard which permits this is GSM 27.010 ...
Tim Small's user avatar
2 votes

What AT command should be sent to modem to get time?

Use AT+CIPGSMLOC command. It works well in SIMCOM modules. This command needs the GPRS service attached before you use it. So first attach the GPRS service using appropriate command sequence then use ...
MDR's user avatar
  • 21
2 votes

SIM900 Error on AT Command AT+SAPBR=1,1

Close the bearer first AT+SAPBR=0,1 and then open it again AT+SAPBR=1,1
Vincent Alex's user avatar
2 votes

How do I send data over TCP from a SIM5320A?

Turns out that the issue that I was having is that I was not using the commands AT+CGSOCKCONT=1,"IP","CMNET" and AT+CSOCKSETPN=1 before opening the TCP socket. If you are trying to get the SIM5320 to ...
cyborgdragon's user avatar
2 votes
Accepted

Fetching network time from simcon 800c gsm module

i tried the following commands to get the correct time from the network. AT+COPS=2 AT+CLTS=1 AT+COPS=0 AT+CCLK?
pranjal khanduri's user avatar
2 votes
Accepted

SIM808 always returns the same temperature

Simcom has discontinued the Temperature readout for cost down reasons. The diodes in the module which are required for temperature readout are no longer assembled. The feature was not useful anyway, ...
doc martin's user avatar
2 votes
Accepted

What are AT commands ? When to use them?

As far as I know you can configure the HC-05 module with AT commands. Sometimes you want to change the baud rate of the module, the role (master - AT+ROLE=1 /slave - AT+ROLE=1), to get module ...
pantarhei's user avatar
  • 879
2 votes

Why does the Atmega328 USART get trapped in a loop?

You cannot have the same UART wired to both the PC via USB serial and also the mobile modem, without causing such mixups. You need a second UART, either hardware or software as typical Arduino ...
Chris Stratton's user avatar
2 votes

How to call AT command on XBee from Arduino

There you go. ...
oscros's user avatar
  • 121
2 votes

Why can't ESP32 read all of serial incoming data?

This is a buffering issue. If you count up the bytes in the text you received, you get 256. The HardwareSerial class uses hardware receive buffers, and sets a ...
Polynomial's user avatar
  • 10.7k
1 vote

CANBUS Masking and Filtering

If you want as many as 9 out of 13, then acceptance masking is pretty pointless. It is generally an overrated feature of CAN from the time before "mailbox" CAN controllers were invented. The ...
Lundin's user avatar
  • 20.4k
1 vote

SIM800l keeps disconnecting after I send at+sapbr =1,1

Most likely, this is a power issue. The module isn't getting enough power it requires when you open bearer. Try putting a 2200uf capacitor between the vcc and gnd of the module.
olaide's user avatar
  • 11
1 vote

GSM SIM800C not responding

You never send anything to the GSM module, so you never receive anything from it. If I understand what you are trying to do, then you need to read from mySerial in your loop method and write anything ...
JRE's user avatar
  • 71.8k
1 vote

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

Why don't you just do everything on the ESP? There's no reason to use the AT interface and add a second microcontroller. Having said that, I wonder how information gets into your MCU in a way that ...
Elliot Alderson's user avatar
1 vote

Bluetooth HC-05 AT Commands

For going into command mode Use a TTL to USB converter. To connect this converter module to the Bluetooth module, just follow the following wiring ...
Mojtaba Miraki's user avatar
1 vote

Bluetooth HC-05 AT Commands

I got there in the end with this. Bear in mind the following conditions when trying to send AT commands to the HC-05: The default baud rate on my module was 9600, not 38400 as described in certain ...
Joe's user avatar
  • 183
1 vote

SIMCom SIM808 SD card problem

Have you looked at this document ? Setting mode = 1 means "PCM interface is valid". Setting to 0 means SD card. Also, in these cases, you should generally try the query command first - to see its ...
mike65535's user avatar
  • 1,493
1 vote

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

I sent an e-mail to quectel manufacturer and they sent me a specific document for FILE AT commands. Here. For some reason, neither MikroEletronica or quectel have this file available on MC60 ...
Ricardo Goncalves's user avatar
1 vote

SIM808 always returns the same temperature

It seems the version of the SIM800 Series User Manual that I posted above from Adafruit (v1.09) is out of date. The newer version v1.10 from simcomm2m.com mysteriously has the ...
skot9000's user avatar
  • 113
1 vote

SIM800L - No response while sending AT commands

Just include '\r\n' after command AT. For example (test the code below): ...
Robson Maciel's user avatar
1 vote
Accepted

SIM800L not responding to AT commands

Ok folks I am now successfully interacting with the module ! Here is the few steps which helped me: changed Grsp = gsm.readString(); to ...
NoonanRosenblum's user avatar
1 vote
Accepted

Testing a connection to a TCP socket through SIM5320A cellular module

About the easiest way to get a response from a server is to do a HEAD request. For example, open a socket to www.stackexchange.com port 80 Then send: ...
tcrosley's user avatar
  • 48.2k
1 vote
Accepted

Cell broad cast messages command not working in SIM 800C

Table with command description from SIM800 Series_AT Command Manual_V1.09, that you can get just by register on manufacturer's site, is placed bellow. Of course, all very confusing: total 5 different <...
imbearr's user avatar
  • 288
1 vote

How to Make Sure SIM900 modem will always give me +PSSUTTZ string?

As others have mentioned the +PSUTTZ comes at the option of the network. One other option to get the current time is through the GSM Location and Time command ...
skot9000's user avatar
  • 113

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