On Sunday 12 August 2007 07:21:36 Itamar Amsili wrote: > Hi Jacob, > > I'm looking for a DHCP-style application, but much simple, which means > assigning a 2-byte address(the TOS_NODE_ID in tinyos 2.x) to a node who is > joining a network. if there is no network in the reception area, the node > will assign to itself the default=1, and will continue searching the area. > if the node finds a nother node, i.e. there is a network around, it will > recieve an address to assign from the network(depends on how many nodes are > in the network already). It's an Ad-Hoc network,no leader. > this is it in general. it is not so complicated but i have no experience in > the NesC code so i need an example or reference of the operations we take ( > initializing, sending & recieving data, timers etc ). If you have any ideas > it will be great.
We implement a dhcp-like address assignment operation. When a node wants to join a message, it unicasts to the well-known base station address a join request packet, which includes its node-unique id value (a 64-bit guid in our case). The base station looks in its active tables for a guid->netid mapping and if not present it creates one via a hash. It then returns a join response packet to the original requester, via broadcast. The node then sets it's local ID via amSetAddress() exported by ActiveMessageC. It also sets TOS_NODE_ID and does some jockeying with the cc2420 radio so that it is also informed of the new local netid (2.0.2 may add some stuff to make this easier). Hope this helps. > > Thanks in advance > > Itamar > > > ----- Original Message ----- > From: Jacob Sorber <[EMAIL PROTECTED]> > Date: Saturday, August 11, 2007 21:25 > Subject: Re: [Tinyos-help] Application of dynamic address allocation > To: Itamar Amsili <[EMAIL PROTECTED]> > Cc: [email protected] > > > Are you looking for a full dhcp-style application or do you want > > to know how > > to change the mote's address? > > > > Changing the mote's address should be easy. At least in > > Tinyos 1.x, > > TOS_LOCAL_ADDRESS is just a variable (uint16_t). So, you > > should be able to > > change its value at runtime. I haven't ever needed to do > > this, but from the > > code I don't see any reason why you couldn't. Try it out > > and see. > > > > As for doing dhcp on motes, I don't know of any existing > > application that > > does this. I'm sure you can do it, but I don't know that > > you really want > > to. If you could give some details about what exactly you > > need, it might > > help. What kind of addresses are you assigning? 2- > > byte TinyOS addresses? > > IPv4? Do you need to be able to uniquely identify your > > nodes (i.e. do you > > need a unique node address (like a MAC address) as well as the > > dynamic one? > > > > Anyway, hope that helps. > > > > Jacob Sorber > > > > On 8/11/07, Itamar Amsili <[EMAIL PROTECTED]> wrote: > > > Hi all, > > > I need to implemet an application of allocating an address to > > > > a mote in a > > > > > dynamic way, > > > i.e. after the mote is waking up, it's searching for a network > > > > to join, if > > > > > finding one- the network gives it > > > an address, and if not- allocating to itself an address. > > > Is anyone has an idea or example or kind of application i can > > > > use to help > > > > > me? > > > I need it ASAP... > > > > > > Thanks alot, > > > > > > Itamar > > > > > > _______________________________________________ > > > Tinyos-help mailing list > > > [email protected] > > > https://mail.millennium.berkeley.edu/cgi- > > > > bin/mailman/listinfo/tinyos-help > > > > > > !DSPAM:46bf156e143321804284693! _______________________________________________ Tinyos-help mailing list [email protected] https://mail.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help
