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Tunnel - An advanced example for reading 2 serial devices using a single modem/SIM and simultaneously using GPRS connection and GSM calls. There is additional serial tunnelling when there are no GSM/GPRS
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GSM/GPRS Projects Based on PIC Microcontrollers and Arduino: Dogan Ibrahim, Ahmet Ibrahim: 9781907920592: Amazon.com: Books
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Amazon.com: OSTENT Quad-Band GSM GPRS Modem with Wavecom Q24PLUS Module USB Interface TCP/IP SMS MMS : Electronics
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Amazon.com: OSTENT Quad-Band GSM GPRS Modem with Wavecom Q24PLUS Module USB Interface TCP/IP SMS MMS : Electronics
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