I am trying to execute some USSD commands with sim800 and store the result.
I need to enable ring interupt for USSD commands just like calls and sms.
Here is my Sim800 code for using ussd:
AT+CUSD=1,"[some ussd]",15
Please note that my code works fine without the ring interupt but I need a way to it with interupts.
Thanks
Related
I am programming some functions in a STM32 board. This functions consist in sequences of AT commands, which are sent over UART to the SIM7000E module, to do different tasks. The module uses a SIM with GSM.
The configuration function sends the following commands:
AT+CPIN=1234
AT+CREG=1
AT+CGATT=1
AT+CIPMUX=0
AT+CSTT="vpn","user","password"
AT+CIICR
AT+CIFSR
Now I want to program a function to check if the module is consuming network data after the configuration function. I am not sure whether I should check CREG, CGATT, CIICR or other command.
So the question is: In which point is the SIM consuming network data?
Thank you in advance!
I think It starts consuming data after the AT+CSTT command. Until the AT+CSTT command, module does not have the GPRS connection. After the AT+CSTT commands it is open to GPRS calls.
On the other side, even if you have an unvalid SIM card before the attaching the network, you can not know that you have data packet or not. I think like that I am not %100 sure but, I suggest like that.
I am trying to write standalone ESP8266 code so that it can communicate to wifi and change its states. For this, what I want to do is to send some command "AT+CWMODE=1" or "AT+CWMODE=3" to ESP8266 via code and toggle them on push button tap.
So, like in Arduino there is a Serial.write which writes on a serial monitor via SoftwareSerial class.
But when I am sending Serial.write("AT+CWMODE=1") it prints on the monitor as a string rather than changing the wifi state.
Is there a way to send AT commands without using Arduino chip software serial pins?
Thanks.
Sorted out the issue. All those who are new like me to ESP world, I did the serial.write "AT" commands using wifi classes of Esp8266.
You need to connect the board as ESP8266 Generic Module and send/receive data using ESP8266Wifi class, by reading the scanned networks, changing mode, using Serial.read on the connected devices on Access point of Esp8266.
Let me know if someone need help on this future, I will be happy to help.
I am using a gsm sim900 shield connected to an Arduino uno for my project. The Sim900 only responds to AT commands when I upload an empty sketch to the Arduino. If I put any AT command code in the sketch, the sim900 just echoes the AT commands without giving any response. What could be the problem?
with the information you gave I can throw a guess and say that you don't write at the end of the AT command "\r\n".
I am using an arduino with HM-10 Bluetooth module. I am able to detect other HM-10(slave) in the vicinity of HM-10(master). In HM-10 datasheet AT+RSSI? command is mentioned which i tried with all possible combinations, but i am unable to extract the rssi value. Is there any way such that i can determine the rssi value using arduino on serial monitor. Any relevant code other than the command will be appreciated.
thanks in advance.
According to the "datasheet", "This command only used by Remote device query when connected."
Basically, to get this to work, you will need to set your slave to remote control mode with the AT command
AT+MODE2
Then, connect your master and slave. After this is done, you should be able to send the master the command "AT+RSSI?", it will send it to the slave, which will pick it up now that is in remote control mode. The slave will then reply with its RSSI value.
I have an Arduino sending and receiving instructions with a Python script via a serial port.
The Arduino takes a button state and when it is pushed, it will send a message via the serial port to a Python script and await a response. (via Serial.available()). It works well enough.
However, if the Python script has crashed for whatever reason (ideally it will run in the background, so it can't be easily checked), the Arduino will wait forever and will be unavailable even on a script restart.
Is there a way for my Arduino to check if there is something listening on the serial port? (and alert me with flashing lights, etc. if not) or is this not how serial works? Worst case I guess I could use a timeout, although that is not ideal.
You have a limited ability to detect if there is something listening on the other side by using the DSR/DTR pins.
When you open the serial port on the machine your scripts runs on, it should raise its DTR pin (or you should be able to convince it to do so: the documentation of the library you use to drive the COM port should tell you how).
Then, on your Arduino, you can check its DSR pin (assuming null-modem wiring with handshaking, where the PC DTR pin is wired to DSR+CD on the Arduino) at regular intervals, and handle the 'nobody connected' scenario in any way you see fit.
One problem with this approach is that your PC script may not close the serial port when it crashes/stops responding, leaving the DTR pin enabled as if everything is still OK. Also, your script may simply miss the message from the Arduino due to errors on the serial line.
For that reason, you should always implement a timeout in your receive routines: even if there is a party listening at the other end, there is no guarantee it has received your message (or that its response will reach you intact).
Re-sending the message at least once (assuming DSR is raised) if a timeout occurs makes your protocol more reliable.
The Arduino doesn't use the DSR line or any other handshaking line, so you can't do what you suggest.
I agree with mdb that timeouts are necessary, but would also add that you might want to implement simple challenge/response system that periodically checks if anyone is listening. (I like ircd's Ping-Pong analogy).