Hi Guys,
This is my first post on the forums. Over the past year have been doing a lot of reading around and almost all my questions have been answered.
But today is the day that for the love of me I cannot understand what I am doing wrong.
I am doing a simple project where I need my Nano to communicate with a Simcom 7600E and that should send data through MQTT.
Before I wrote my code I took my FTDI adapter and tried all the commands I needed and I finished my commands flow in order to be able to setup and send MQTT messages. No issue whatsoever.
I tried all my commands on 115200 baud, no issues.
Then I decided to to set it up with my Arduino. Connected TX/RX to RX/TX respectively on the Arduino and GND is common. Also no usb connected in the arduino all debugging is done through the same serial port.
I am also using a bench PSU so no issues there, plenty of amperage.
The shield that I'm using is not able to communicate. link
In order to accommodate some other devices I am also using a 1 to 8 USART expanded link. Other devices I have there like an air particle, detector, a debug port and CO2 device communicate with no issue.
In order to communicate with the different devcices I can switch the port on the expander.
But just in case the expander was causing issues I also tried to remove it from the equation and directly plug it on the RX/TX pins + GRND.
I simulated also the responses the that the modem is supposed to send and the code cycles as it should.
Commands sent with the same FTDI adapter.
If anyone has any idea or has had the same issue and wants to give me a hand it would be awesome.
BTW Merry Christmas and happy holidays to everyone.