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Questions tagged [sim800]

The SIM800 is a complete Quad-band GSM/GPRS solution in a SMT module which can be embedded in the customer applications. It is the successor of the SIMCom [tag:sim900].

Use this tag for questions related to SIMCom 800 series modules.

145 questions
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Connect WEMOS D1 R32 and SIM800L

few day I'm trying to connect SIM800L module and WeMos D1 R32 board. But any response from SIM module (SIM module is connected to GSM network, LED blink slow. But any response to commands Also I triedy SIM900). WIFI works fine. Main task why I…
Oliwer11
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Sending Sensor Data to Firebase using ESP32+Sim800L

I have a TTGO T-CALL ESP32+Sim800L board and I want to send accelerometer data to Firebase. I am using the TinyGSM library which supports SSL/https connections for Sim800L. I am currently sending dummy data to see if it works but it is giving me a…
Madhav Rawal
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Timeout connecton between SIM800A and Cloudmqtt

I have a problem with a timeout connection when I use SIM800A to subscribe to a topic on cloudmqtt. All is ok when I send the connect and subscribe packet with AT commands, but after 2 minutes the SIM800A disconnects from cloudmqtt and closes the…
Tam Tan
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Arduino + SIM800A messages get cut-off

I am working with Arduino and SIM800A. My goal is to save the sms message received by SIM800A to a string variable to be used later. Yet to my surprise, the message always get cut off and I have no clue why. I send to SIM: This is a test…
hacaoideas
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How to detect if an AT modem originated call was rejected

I'm not sure whether this questions fits here or at electrical engineering stack exchange. Nevertheless... I have an SIM800L modem controlled through serial port. Inserted SIM belongs to an O2 Czech Republic operator (230 02). When I make a call…
rudolfdobias
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sim800 cme erro2 when i pass at commands through code arduino esp32

I am trying to push sensor data to aws cloud database through sim800 gsm module. I am able to do it by entering the at commands manually via serial monitor but when i incorporate the at commands in the code to automate the process so I don't have to…
prince
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STM32 , main loop does fire if receive data quickly using DMA

I am using DMA in circular mode with STM32 sim800c module. i can send/receive AT commands/response without any issue, but getting issue when i tried to download file using AT command, when start receiving data from UART, DMA RxCpltCallback function…
haseeb bhatti
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Cannot use TCP trough SIM800 modem

I tried to use send a GET request using TCP over a SIM868 modem , but I always received "ERROR" after the AT command: AT+CIPSEND. Using minicom on my raspberry 3 , these are the command I sent: AT+CSTT="APN…
CBal
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Sim800c not receiving the complete SMS

I am using sim800c module connected to stm32 "bluepill" development board. I am trying to receive the SMS to be parsed later on. Here is my code: while(sim800C.available()>0){ delay(1000); …
Hamid Rajabi
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How to get live GPS Sim800 Module RTC time on Arduino

Hello I wanted the live GPS Sim800 Module RTC time on Arduino without the use of library, I am able to achieve it using library but without library the correct data comes in only 1 minute and other comes the garbage. Please tell me the code that can…
Electro Tech
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cannot publish data to my local mqtt server

Please i wish somebody could help me with this. I've been struggling into it since a couple of weeks, i am so new to that. I want to send data from ESP32 SIM800L to a mqtt broker. The mqtt server is running on my local machine and the ESP32 SIM800…
nadia
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Send APDU to sim868 via AT+CSIM

I have GSM/GPRS/GNSS/Bluetooth HAT for Raspberry Pi with SIM868 I want to communicate with sim card over APDU command with AT+CSIM command. The datasheet says that this at command is supported by sim868. I tried to send the following AT…
Yan
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SIM 800L cannot connect to at

I am trying to send some data using the sim800l module. I am using the SoftwareSerial library and connected the RX and TX pins to Digital pins 10 and 11. I have also tried pins 2 and 3. The module is connected to a 5v power supply and the only pins…
Silviu Babescu
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Publishing over the HTTP Bridge - Google Cloud Platform - Problem

I have an esp32 board connected to a SIM800L gsm/gprs module. I'm using TinyGSM library for this project. Somehow I cannot get my setup to publish data succesfully through an http bridge to the Google cloud. Previously I ran the examples shown on…
Iván Pianetti
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How do I get the public IP address when starting a GSM modem in server mode?

I have a SIM800C GSM module that I want to use to make a server. I am really confused about knowing the public IP address. In order to make people to connect to any server is that they need the correct public IP address and the correct port, and of…
Hasan Shadi
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