Send and receive SMS via RS232 (iii)

Receive SMS

There are two ways to receive incoming SMS: polling terminal; using events

polling terminals can be used on a regular basis The at+cmgl=0 instruction reads the unread fetch instruction. The method is simple, but many times do not work hard, inefficient, generally not recommended. The following is the main explanation of event law:

Instructions:

At+cnmi=<mode>,<mt>,<bm>,<ds>,<brf>

Parameters:

Mode:

0--cache in terminal

1--Send directly to TE

Mt:

0--Receive new SMS does not return event

1--if the received SMS is stored in ME, the returned

+cmti:<mem>,<index>

2--In addition to Class2 SMS, the new SMS is sent directly to the terminal, which returns:

+cmt:<length><cr><lf><pdu>

3--CLASS3 SMS is returned using the mt=2 method, and other types are returned using the Mt=1 method.

BM:

0--cell broadcast does not notify

2--new cell broadcast notification, return

+cbm:<length><cr><lf><pdu>

3-- cell broadcast notification in CLASS3 format, using bm=2 format

DS:

0--Status report not notified

1--New status report notification, return:

+cds:<length><cr><lf><pdu>

2--returns if the new status report is stored to ME:

+cdsi:<mem>,<index>

BRF:

1--Always 1

Cases:

generally we use at+cnmi=1,1,0,2,1

When a new SMS message is received, the terminal returns:

+cmti:me,5

New status Report:

+cdsi:me,6

The program can determine the return value and use the At+cmgr instruction returns new to SMS.

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Send and receive SMS via RS232 (iii)