I am using the code furnished below to send an sms to a SIM900A GPRS module ( without shield ) via a Altsoft software serial. I am using Arduino UNO in this project. Most of the time, it works but sometimes it doesn't. I understand I am supposed to receive an "OK" response to confirm that the sm…

Sending SMS message vis GPRS SIM900A with Arduino UNO is not reliable

seccpur August 23, 2021, 9:15am 7

The "OK" response normally comes together like so, but misses sometimes.

SMS sent