I’m using a Wavecom WMOD2 modem for sending SMS. I found something strange.
I use AT+CNMI=2,1,0,1 to get new SMS and delivery report indication. But after I get first +CDS: indication, the CNMI value change to +CNMI: 2,0,0,0,0(default value) automatically.
I even tried to set AT+CNMI=2,1,0,1 before I send each SMS and set it again every 15 seconds. I still cannot get all +CDS indication.
These are the commands sequence I’s using.
+CNMI: 2,1,0,1,0 <—this is the value I set, it’s correct.
+CNMI:2,0,0,0,0 <—Check it after +CDS: indication, the +CNMI value just changed to the default value automatically.
I’m using USB2COM adapter to connect to this modem on my laptop. Could anyone tell me why it happens? How can I fix it? Thank you very much.