Hello. I have a gsm shield arduino and esp32 cam. The tx and rx are hooked up from my esp32 to my arduino. It takes a picture then sends the image as hex to my arduino I want to send the image by text message. Here is a similar thread I am doing a similar thing but trying to send an image.
Hi everyone! I have a problem with my arduino uno board and my gsm shield,the messages aren't send from my gsm to my phone, i link my gsm with my arduino like this
[image] and use this code
SoftwareSerial GPRS(7, 8); //7 = TX, 8 = RX
unsigned char buffer; port
int i = 1; //if i = 0, send SMS.
GPRS.begin(19200); // the GPRS baud rate
I have been searching around and not found any answers. Does anyone have any tips? thanks.
That's an MMS message. I didn't see any MMS commands in the SIM900 AT Commands manual, just in the SIM800 AT Commands manual. Which chip is on your GSM Shield?
Update: Here is the basic AT Command Manual for the SIM900:
Note: Their HTTPS certificate is out of date so you may have some problems viewing and/or downloading the document.
Hello. This link shows my board. I don't know much about them.
The big square thing in the middle of the board, labeled "SIM900", is likely a SIM900.
Good news! The SIM900 does have MMS AT commands! They are just in a separate document:
Thats awsome news thanks alot for the help.
December 20, 2021, 11:01pm
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