How to sort or list received "UNREAD" SMS messages

[flotulopex]

Hi pedja089,

Read one by one UNREAD MSG

I think, that's where I'm currently stuck - I have no idea how to achieve this (appart from using command AT+CMGR=n but this implies I have listed/sored the message's index before), reading messages one-by-one. All AT commands I know will list the SMS messages and (unfortunately) change their status from "REC UNREAD" to "REC READ" despite I didn't really read them.

I just noticed that, whenever an SMS message is received by the SIM7600E module I use, I get this through the UART interface:
+CMTI: "SM",n where "n" is the number (or index) of this SMS message.

I could store the message's index into an array an treat them on-by-one. But what if I miss one of these +CMTI information? What if my PIC is doing something else than "listening" to incoming messages?

I'm confused since I can't make sure that I wont miss any incoming message.

Since I don't see how to list unread messages one-by-one (can't find any info about this way of doing), should I go for listing all "REC UNREAD" messages and store their index in a list and parse them from now on "one-by-one"? Is this the way?

[pedja089]

Oh, I see now...

Use AT+CMGR=, and just list all indexes.
And delete that index as soon as PIC receive whole MSG.
Also you can use AT+CMGL="ALL",1 to not change status...
EDIT:

https://simcom.ee/documents/SIM900/S...nual_V1.11.pdf

Look at 4.2.3 AT+CMGL and 4.2.4 AT+CMGR

[flotulopex]

Also you can use AT+CMGL="ALL",1 to not change status...

Okay, this is new to me.

I'll give it a try right now - thanks a lot

[pedja089]

Look at EDIT in prev. post.
But I prefer described way, to list index one by one, and when pic receive MSG delete.
Do this one per second, and I cant have more than 1 or 2 unread msg. And then it is easy to get correct order, and everything else.
I have done that in past, if I can remember...

[flotulopex]

Thanks pedja089, I'll give it a try the way you suggest

[flotulopex]

Well, the AT+CMGL="ALL",1 doesn't exist (at least not for the SIM7600E module).

What it's datsheet says: