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In my opinion,the hardware of wireless sensor has reached a certain level.And if you want to reduce energy consumption of sensors,you must design a efficient routing algorithm.
I found the reason.I send and receive SMS through code with serial port in LINUX. I keep always send a AT command to port with 2s to keep port awake,I can receive a SMS immediately after that.And if you want to send a SMS through the code,the character 'CTRL+Z' should be represented as '\x1a'...
When i want to send a text SMS to my sim900 module,i found my module can not recognize the text SMS immediately.But it can recognize the text SMS after I make another call to my module.I do not know why.Maybe my module is just sleeping,and what will i do...
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