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Questions tagged [sim800l]

46 questions
3
votes
1 answer

SIM800L check if call was answered

I need to disable the dialing tone on my SIM800L and for that I need to know if the receiving end has answered the call. AT+CPAS returns 4 which stands for 'in progress' both during conversation as well as during the tone before the call is answered…
tomas1808
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3
votes
2 answers

Unable to send HTTP POST payload of size greater than 1449 characters with SIM800L+ESP32

So I am sending data to my php script hosted on 000WebHost via HTTP POST on my ESP32+SIM800L set up. I am recording sensor data at 800Hz and storing it in an character array like: a[]=3&a[]=5&a[]=8... which becomes my payload array for the POST…
Madhav Rawal
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3
votes
1 answer

SIM800L: AT+CIICR always goes to PDP DEACT state

I'm trying to send data to a server using my SIM800L which is connected to a LoPy. Using the attached diagram I want to go from state 0 to 6 in order to send and the issue I encounter is at state 2 ( AR+CIIR that returns an error ). SIM800L diagram…
RazvanPopescu23
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2
votes
2 answers

SIM800l V2 Keeps Blinking Every Second

I'm desperately looking for a solution for my SIM800l v2. The network LED just keeps blinking every second. It does not restart but it keeps blinking and not picking up a signal. I tried powering up using a laptop USB port but it does not solve it.…
Beginner
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1
vote
0 answers

Zephyr RTOS Send SMS via SIMCOM SIM800L

I am trying to send SMS from my code. I assembled AT commands according to SIM800L datasheet and internet guidance, but I cannot send any. No matter what I do, it seems like I cannot register to GSM network. I tried 2 identical modems, I tried 2…
Ivo Hora
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1
vote
1 answer

SIM800L Date and Time is not working. How to convert from int to string?

I am currently working on a device and it sends data to Firebase. Unfortunately, I am unable to send the correct time and date. CONVERT TIME INT TO STRING I tried setting the time but it ignores the changes. AT+CLTS=1 should enable network time…
CodingRookie
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1
vote
1 answer

Error 603 when trying to connect to Firebase

I want to send a POST request from a SIM800L module to firebase. So far I have only got the error 603, which tells me that I have no access right? When I send the same request from Postman installed on my laptop it works fine, read and write access…
Matteo Zuccaro
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1
vote
1 answer

Arduino + sim800l + dht11

I am trying to make a call only once. But it is calling over and over. Code is If(t>20){ Sim800l.println(ATD +phone number)} How can I make it to call me once only? I just need to inform me if temperature is over 20°C. Using dht11, arduino uno and…
Nikola Kozina
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1
vote
1 answer

How to delete all SMS from SIM800l?

I used to have an SIM800l module that I do not know exactly how I set up, but every time I deleted a SMS from the first memory location, the other SMS were moved up to the position of the first SMS, always occupying the position number one in…
mohammad bagher Malekhosseini
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1
vote
3 answers

How to read GSM AT command response on arduino Serial port for long response?

I have Arduino UNO and a Sim800L module and I know the way to read the serial, it is something like this question, but when I perform this function : String GetRegData() { Serial.println("Get nearby antenna info ..."); …
malloc
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0
votes
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SD card module and GSM integration with arduino UNO

I'm using sim800l EVB and I have two codes one for Sd card and another for GSM. When I put the two codes together so I have one code, the sd card is able to initialize but the gsm does. When I debug to find out what wasnt executing, it was the…
BR41NE
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0
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1 answer

Arduino UNO - SIM808/GPRS Module is not making POST request

Good night, I am opened a ngrok tunnel for my web project and I am trying to make a POST request from SIM808 module. The codes and output given below: // Libraries / Defines ... char httpLogin[] = "POST /api/device/login HTTP/1.1\r\nHost:…
Beresyus
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0
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0 answers

send sms with sim800l and micropyhton

I wrote a program using the ESP32 board, sim800l and micropython to send a message to my phone, but it doesn't work, maybe there is a problem with my code and also the flashing light blinks once every second it means it doesnt connect to network,…
Mr.Hacker
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0
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0 answers

SIM800L Network Error While Sending E-Mail

I have a SIM-800L module and I am trying to send an email using my various email accounts. I tried using manual serial port AT commands and finally, I got this "Network…
BehicMV
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0
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0 answers

TTGO T-Call ESP32 and RC522 interferring

I am trying to make a device to replace an old paper-based "Sign In - Sign Out" timesheet with a combination of an RC522 RFID module and an ESP32 dev board. I have managed to make it work with a D1 Mini via Wifi however since I am not allowed to use…
RobbAdam
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