Interfacing GSM module with nodemcu

Question

I wrote this code to interface the gsm module, can anyone check the code and give me some propositions ?

hex1= '0x1A';
function delay_s(delay)
delay = delay or 1
local time_to = os.time() + delay
while os.time() < time_to do end
end
uart.alt(1);
uart.setup(0, 9600, 8, uart.PARITY_NONE, uart.STOPBITS_1, 1)
uart.write(0,"AT+IPR=9600\n")
for j = 1, 10 do
uart.write(0, "AT\n")
end
delay_s(1000)
uart.write(0, "AT\n")
delay_s(1000)
uart.write(0, 'AT+CSCS="GSM"\n')
delay_s(1000)
uart.write(0, 'AT+CMGF=1\n')
delay_s(1000)
uart.write(0, 'AT+CMGS="+21654102832"\n')
delay_s(1000)
uart.write(0, " Salut tout le mond !!!\n")
delay_s(1000)
uart.write(0, hex1)
delay_s(1000)

i have the sim900a gsm module http://www.electrodragon.com/product/sim900a-mini-dev-board/ — Sawssen Bejaoui, Jan 31 '17 at 15:58
Do you have anu responses from module ? Like OK. Please tey to be more specific — cagdas, Jan 31 '17 at 15:58
No, using nodemcu i don't have any responses, but i test this module with arduino and it worked perfectly. — Sawssen Bejaoui, Jan 31 '17 at 16:01
when i change the uart.alt(1), the program that i wrote couldn't be uploaded to the board , hav you any idea please ? — Sawssen Bejaoui, Feb 01 '17 at 07:39
I'm voting to close this question as off-topic because it doesn't fit here. Note that Stack Overflow is a question & answer site. "give me some propositions" is not a question that can have a clear answer. — Marcel Stör, Feb 01 '17 at 20:18

score 0 · Answer 1 · answered Feb 01 '17 at 20:27

This code won't even run on NodeMCU because the standard Lua os.time() will fail since the os module is not available. I suggest you dig into http://nodemcu.readthedocs.io/en/latest/en/lua-developer-faq/#how-is-nodemcu-lua-different-to-standard-lua.

Besides, even if it were available os.time() has 1 second resolution.

The returned value is a number, whose meaning depends on your system. In POSIX, Windows, and some other systems, this number counts the number of seconds since some given start time (the "epoch").

Hence, your delay_s(1000) would delay execution for 1000 seconds. Doing that with busy-waiting is...not optimal.

You probably want to use the tmr module instead.

Thanks for your response. I would like to interface the gsm module using the nodemcu, but that doesen't work. should i add software uarts iin order to be able to use other NOdemcu GPIOs ? — Sawssen Bejaoui, Feb 02 '17 at 07:23

score 0 · Answer 2 · edited Sep 18 '17 at 14:44

0

uart.alt(x);

0 - standard pins
1 - alternate the pins

You havent specify which pins you are gonna use for the communication, or else use uart.alt(0); for standard pins

edited Sep 18 '17 at 14:44

Leonardo Alves Machado

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answered Sep 18 '17 at 13:36

Ram Kumar

1

Interfacing GSM module with nodemcu

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