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sim900 serial communication doesn't work

Question asked by Capezzera.Alessandro on Apr 16, 2017
Latest reply on Apr 19, 2017 by Capezzera.Alessandro

Hi, I'm trying to configure sim900 serial communication with stm32f401re but it seems that it doesn't receive any serial command, source code i'm using: [C++] sim900-main - Pastebin.com (tried with differents port combinations and with at command tester but it doesn't work and probably I'm forgetting something). I attach a photo of my stm32 connected with sim900

Thanks for the support
PS: the status of the sim900 blink with 1sec interval and I know that it should be 1 blink each 3 seconds, what am I missing?

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