Re: [Tinyos-help] Sending multiple messages in one shot
Vikram, In general, each instance of the AMSenderC component only supports a queue of 1 message. So just calling send() twice will likely result in some failure. I haven't actually tried this myself (nor have easy access to the code right now), so i don't know if the 2nd send will return an error or what the exact end result would be. One way to send two messages is to queue up the first message in the sendDone() event that is called after the first send() call. You must be careful to make sure that the sendDone event is for the first message you sent. There are queue data structures available in tinyos 2.x so if you wanted to create your own component, you may want to start from there. It is also likely that someone else has implemented this feature (for certain protocols I'm sure it's been implemented, but I don't know of any generic component that has been built. You may want to check out the contrib directories in the cvs checkout. Another option is to look at your platform-specific implementation of AMSenderC and see how it manages its queue. With some minor modifications, you could create your own component that supports an arbitrary queue size. -Paul On 12/29/2009 12:57 AM, Vikram vik76 wrote: Hello, How do I send multiple messages ( say two messages) one after the other? The send statements in my code are one after the other. Is there any queuing in tinyos which will take care of this automatically? Because, when the second message is sent, the first message may still be using the radio. Thanks Regards Vikram ___ 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
[Tinyos-help] CTP Network/Group Separation
Hi all, When using CTP, we would like to separate two adjacent networks from each other (i.e. make sure that nodes of one network do not send data to the root of the other network). Particularly because networks have different data packet formats and we don't want them to get dropped/mixed up. I know we can operate the networks on different RF channels, but this is not a preferred method for us. Can group and/or collection id be used for this purpose? If not, does CTP require modification for network separation? Which files/libraries should we be modifying? Any ideas would greatly be appreciated. Thanks in advance. Bulut ___ Tinyos-help mailing list Tinyos-help@millennium.berkeley.edu https://www.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help
Re: [Tinyos-help] Sending multiple messages in one shot
Vikram, Perhaps you can consider creating two different AM types for these messages. Thus you can send both of them - since each AMSender has a different queue. I'm bot sure though, that the messages will be sent in the same order you have sent them (although it is very likely) Arik On Tue, Dec 29, 2009 at 10:16, Paul Johnson oewyn...@gmail.com wrote: Vikram, In general, each instance of the AMSenderC component only supports a queue of 1 message. So just calling send() twice will likely result in some failure. I haven't actually tried this myself (nor have easy access to the code right now), so i don't know if the 2nd send will return an error or what the exact end result would be. One way to send two messages is to queue up the first message in the sendDone() event that is called after the first send() call. You must be careful to make sure that the sendDone event is for the first message you sent. There are queue data structures available in tinyos 2.x so if you wanted to create your own component, you may want to start from there. It is also likely that someone else has implemented this feature (for certain protocols I'm sure it's been implemented, but I don't know of any generic component that has been built. You may want to check out the contrib directories in the cvs checkout. Another option is to look at your platform-specific implementation of AMSenderC and see how it manages its queue. With some minor modifications, you could create your own component that supports an arbitrary queue size. -Paul On 12/29/2009 12:57 AM, Vikram vik76 wrote: Hello, How do I send multiple messages ( say two messages) one after the other? The send statements in my code are one after the other. Is there any queuing in tinyos which will take care of this automatically? Because, when the second message is sent, the first message may still be using the radio. Thanks Regards Vikram ___ Tinyos-help mailing listtinyos-h...@millennium.berkeley.eduhttps://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 -- Best Regards, Arik Sapojnik sapoj...@gmail.com ___ Tinyos-help mailing list Tinyos-help@millennium.berkeley.edu https://www.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help
Re: [Tinyos-help] Sending multiple messages in one shot
Hello, Thanks for your response.. Paul and Faisal - I have implemented it in sendDone for calling subsequent messages. It works fine. Arik - I tried your way of having two different AM types. This also works fine for successive messages. Regards Vikram On Tue, Dec 29, 2009 at 9:01 PM, Faisal Aslam as...@informatik.uni-freiburg.de wrote: Dear Vikram, You wait for sendDone. You should not send a new message until sendDone is called for the first message. Usually people send more message from within sendDone. best regards, -- Faisal Aslam University of Freiburg http://cone.informatik.uni-freiburg.de/people/aslam/ Vikram vik76 wrote: Hello, How do I send multiple messages ( say two messages) one after the other? The send statements in my code are one after the other. Is there any queuing in tinyos which will take care of this automatically? Because, when the second message is sent, the first message may still be using the radio. Thanks Regards Vikram ___ 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
[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
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
[Tinyos-help] Distribution of nodes
Hi, Is there anyway (in Tossim) to generate the topology according to some distribution e.g. poisson distribution? My other question still remains unanswered about the error in LossyLayerModel : http://www.mail-archive.com/tinyos-help@millennium.berkeley.edu/msg30986.html Awaiting your help. Regards, Mehwish. -- Verily, His Command, when He intends a thing, is only that He says to it, Be! and it is! (36:82) ___ Tinyos-help mailing list Tinyos-help@millennium.berkeley.edu https://www.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help
