Re: [Tinyos-help] Help required: conversion of AT commands to nesC
Hi, I am Bharti, a final year student studying computer engineering. I am currently doing my project on Wireless Sensor Networks. It is for elderly care. What I am trying to do is to interface an IRIS mote with a GSM modem. Whenever the mote gets a wetness event alert from the sensors attached to it, it sends a SMS to the care taker via the GSM modem. I am fairly new to TinyOS, so I have little idea how I should interface the GSM modem with the IRIS mote to send the AT commands. Can you please help me? It would be of really great help. Thanks a lot. regards Bharti Paul Johnson-22 wrote: Sandhya, I've done some similar work with embedded systems interfacing with GSM modems using RS-232(serial) connections. Basically what I had to do was create my own interface to the GSM modem using AT commands. The micaz platform has an RS-232 connection (the connection is usually obtained by using a mib510/mib520 gateway) which you can use to send AT commands to the GSM modem. One of the first things you will need to do is create your own component for TX/RX plain text (ASCII) over the serial port. The issue is that by default, tinyos sends/receives ActiveMessage Packets over the serial port, just as if it had sent/received that message over the wireless link. You will need to change this so that you use ASCII over the serial. Once you do this, it's simply a matter of creating the required interface that will properly initialize the GSM modem, open TCP/UDP sockets, and sending information over the serial port using at commands(ie: ATD, AT+REBOOT, etc.) Whatever GSM modem you decide to use, it should have a user manual defining all of the AT commands it supports. Several important commands to look for that will make your life easier: Echo -- when this is disabled, the serial port will no longer echo AT commands sent by the mote(enabling this when using hyperterminal/gtxterm makes your life easier, but when programatically sending commands, you don't need this as it makes parsing the mote's RX serial information that much harder), verbose -- This command may/may not be available, it will simplify the result of the AT command. Normally when you execute an AT command you might get a response back like OK or OK\r\nip address: xxx.xxx.xxx.xx with verbose set to the lowest setting, most results are shortened to an integer value, which makes parsing command/responses easier. Certain commands have timing constraints. For example if you have opened a TCP socket, any serial output is redirected over the TCP socket. If you need to temporarily pause the connection and run another AT command. For my GSM modem, the key command was +++. A good GSM modem user guide should have this information documented, however. Good luck with your endeavor, -Paul On 12/29/2009 4:21 AM, Sandhya Sourirajan wrote: Dear Sir/ Madam, I am Sandhya Sourirajan doing my final year, B.E- EEE in Coimbatore Institute of Technology. I am currently doing a project involving Wireless Sensor Networks using the Crossbow's micaz motes for building an intrusion detection system. I checked out the Wireless Sensor Networks REsearch group website and learnt about the developments in this field by sending messages through GSM modules. However no infomation on furnished on interfacing the GSm modules with motes and the conversion of the AT command set to nesC. We would be using GSM modules in our project and the gateway is connected to the GSM module using a suitable connector. The AT commands for the GSM modules have to be written in nesC.As we are naïve to TinyOS and nesC, we have very little idea about the conversion of the AT commands to nesC. Could you please tell us about the feasibility of converting the AT command set to nesC, to send the sensor data from one remote location through GSM modules. Looking forward for your reply. Thanks in advance. -- Regards, Sandhya ___ Tinyos-help mailing list Tinyos-help@millennium.berkeley.edu https://www.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help ___ Tinyos-help mailing list Tinyos-help@millennium.berkeley.edu https://www.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help -- View this message in context: http://old.nabble.com/Help-required%3A-conversion-of-AT-commands-to-nesC-tp26964085p33246540.html Sent from the TinyOS - Help mailing list archive at Nabble.com. ___ Tinyos-help mailing list Tinyos-help@millennium.berkeley.edu https://www.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help
Re: [Tinyos-help] Help required: conversion of AT commands to nesC
This paper has a good discussion of how someone solved a similar problem: Streetlight Power Cable Monitoring System Based on Wireless Sensor Networks http://ieeexplore.ieee.org/stamp/stamp.jsp?arnumber=04097869 and a few more: http://www.ruf.rice.edu/~mobile/publications/yan07bsn.pdf http://ieeexplore.ieee.org/stamp/stamp.jsp?arnumber=04454193 http://www.csse.uwa.edu.au/adhocnets/WSNgroup/soil-water-proj/dsn.journal.18mar05.pdf You might also try taking a look at: http://oregonembedded.com/MoteModem.pdf Good luck! - Original Message - From: Sandhya Sourirajan evenin...@gmail.com To: tinyos-help@millennium.berkeley.edu Sent: Tuesday, December 29, 2009 4:21:05 AM GMT -06:00 US/Canada Central Subject: [Tinyos-help] Help required: conversion of AT commands to nesC Dear Sir/ Madam, I am Sandhya Sourirajan doing my final year, B.E- EEE in Coimbatore Institute of Technology. I am currently doing a project involving Wireless Sensor Networks using the Crossbow's micaz motes for building an intrusion detection system. I checked out the Wireless Sensor Networks REsearch group website and learnt about the developments in this field by sending messages through GSM modules. However no infomation on furnished on interfacing the GSm modules with motes and the conversion of the AT command set to nesC. We would be using GSM modules in our project and the gateway is connected to the GSM module using a suitable connector. The AT commands for the GSM modules have to be written in nesC.As we are naïve to TinyOS and nesC, we have very little idea about the conversion of the AT commands to nesC. Could you please tell us about the feasibility of converting the AT command set to nesC, to send the sensor data from one remote location through GSM modules. Looking forward for your reply. Thanks in advance. -- Regards, Sandhya ___ Tinyos-help mailing list Tinyos-help@millennium.berkeley.edu https://www.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help ___ Tinyos-help mailing list Tinyos-help@millennium.berkeley.edu https://www.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help
Re: [Tinyos-help] Help required: conversion of AT commands to nesC
Sandhya, I've done some similar work with embedded systems interfacing with GSM modems using RS-232(serial) connections. Basically what I had to do was create my own interface to the GSM modem using AT commands. The micaz platform has an RS-232 connection (the connection is usually obtained by using a mib510/mib520 gateway) which you can use to send AT commands to the GSM modem. One of the first things you will need to do is create your own component for TX/RX plain text (ASCII) over the serial port. The issue is that by default, tinyos sends/receives ActiveMessage Packets over the serial port, just as if it had sent/received that message over the wireless link. You will need to change this so that you use ASCII over the serial. Once you do this, it's simply a matter of creating the required interface that will properly initialize the GSM modem, open TCP/UDP sockets, and sending information over the serial port using at commands(ie: ATD, AT+REBOOT, etc.) Whatever GSM modem you decide to use, it should have a user manual defining all of the AT commands it supports. Several important commands to look for that will make your life easier: Echo -- when this is disabled, the serial port will no longer echo AT commands sent by the mote(enabling this when using hyperterminal/gtxterm makes your life easier, but when programatically sending commands, you don't need this as it makes parsing the mote's RX serial information that much harder), verbose -- This command may/may not be available, it will simplify the result of the AT command. Normally when you execute an AT command you might get a response back like OK or OK\r\nip address: xxx.xxx.xxx.xx with verbose set to the lowest setting, most results are shortened to an integer value, which makes parsing command/responses easier. Certain commands have timing constraints. For example if you have opened a TCP socket, any serial output is redirected over the TCP socket. If you need to temporarily pause the connection and run another AT command. For my GSM modem, the key command was +++. A good GSM modem user guide should have this information documented, however. Good luck with your endeavor, -Paul On 12/29/2009 4:21 AM, Sandhya Sourirajan wrote: Dear Sir/ Madam, I am Sandhya Sourirajan doing my final year, B.E- EEE in Coimbatore Institute of Technology. I am currently doing a project involving Wireless Sensor Networks using the Crossbow's micaz motes for building an intrusion detection system. I checked out the Wireless Sensor Networks REsearch group website and learnt about the developments in this field by sending messages through GSM modules. However no infomation on furnished on interfacing the GSm modules with motes and the conversion of the AT command set to nesC. We would be using GSM modules in our project and the gateway is connected to the GSM module using a suitable connector. The AT commands for the GSM modules have to be written in nesC.As we are naïve to TinyOS and nesC, we have very little idea about the conversion of the AT commands to nesC. Could you please tell us about the feasibility of converting the AT command set to nesC, to send the sensor data from one remote location through GSM modules. Looking forward for your reply. Thanks in advance. -- Regards, Sandhya ___ Tinyos-help mailing list Tinyos-help@millennium.berkeley.edu https://www.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help ___ Tinyos-help mailing list Tinyos-help@millennium.berkeley.edu https://www.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help
