I am trying to develop a routing protocol and i need send some bid messages to all nodes which are in my wireless range in ONE simulator and they should reply to this message, and according to information in their reply messages i will choose one of those nodes for my next hope. how can send bid messages to all of nodes which are in my neighborhood?
This depends a lot what you mean by "bid messages" and when exactly you want to send them. You can get all currently connected hosts with the getConnections method in the routing module and you could for example iterate over that list when you want to make the bid and exchange this information (similar to what MaxProp does in changedConnection).
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I've read my docs most examples are for basic use cases.
Where simply one process publish X event and another subscribe to X event.
But in my applications X is kind of variable. so lets say i've X means my user.
so i can do publish from one server event like user-ID means if i've 1000s of user connected to server so will that be Okay to publish and subscribe to so many dynamic topics, and then another 20 servers subscribe to that 1000s topics on this server.
Lets see the example.
i've 10 servers. each server with 1000 users connected. so total 10k users.
i need to send X data from each user to another user.
so i've did this.
X server publish user-ID data (1 publish user's who is connected, 1K publish)
Y server subscribe user-ID data (10k subscribe request to sent each server)
What should be optimal way of pub sub with dynamic topics so less bandwidth used among servers?
Notice::
user-ID is just an example where ID is dynamic number, and it publish some real time data which can't be stored anywhere.
In ZeroMQ subscription matching is implemented in the PUB socket with a prefix-matching trie. This is a very efficient data structure, and I would expect that 10K subscriptions and 10K msg/sec would be no problem at all.
The PUB socket only sends messages for matching subscriptions (so there is no "waste"). If a message doesn't match any subscription then the PUB socket will drop it. Matching messages are only sent to SUB sockets that have subscribed to them.
When you add or remove a subscription, the SUB socket will send a message its connected PUB socket(s). Each PUB socket will then update its topic trie.
My guess is 10k subs and 10k msgs/s is no problem, but the best thing to do would be to write some test code and try it out. Once nice thing about ZeroMQ is that it's not much work to test different architectures.
As far as I know in pyzmq API publisher can send messages to any topic
socket.send("%d %d" % (topic, messagedata))
and subscribers set a filter on these topics for topic of their interests with setsockopt
topicfilter = "10001"
socket.setsockopt(zmq.SUBSCRIBE, topicfilter)
So I think you can fully implement your plan.
I need to send a message only to one vehicle that i want to choose. I am reading the available TraCIDemo11p and the cars are broadcasting the message to all cars. How can change that and make it send the message to only one care for example to car number 3.Thank you
Keep in mind that communication between cars in Veins (or any MANET simulator) is wireless which means that many cars can hear the MAC frame that sent to a specific node.
To send a message from car A to another car B, they must be in their wireless range or they support an ad-hoc routing protocol to reach other not-in-range cars (which is not implemented in Veins, AFAIK).
If you are sure that both sending and receiving cars are in range, then you can fill the destination address in WSM by the ID of the intended car and let the WAVE application to delete any message that has a destination address different from the local ID.
I use Twilio with my team management system. A text message is automatically sent out for each game. The receiver can then reply with YES or NO. My issue is that when I send two text messages, I have no way to tell if the reply is for the first message I sent, or the second.
Does Twilio have any way to determine which text message it was a response to?
Twilio developer evangelist here.
If you are sending two messages from one Twilio number to the same user number there is nothing within the SMS specification that allows a user to reply to a specific message, so there is nothing you can do with Twilio to detect that.
If you are sending two messages to two different numbers and you get replies from those numbers, you can match against the from number and see what the last message sent from that number was and attach the reply to that.
Alternatively, if you want to get replies from one user to different messages, you could send them from different Twilio numbers. That way you can match the outgoing number to the message and the answer. This is mostly used for phone number masking to enable anonymous communications and there is a good tutorial available on this in the Twilio documentation.
Let me know if that helps at all.
Our scenario is as follows:
We have a marketplace where sellers will receive multiple messages throughout the day from users.
We want to send message notifications etc via sms to sellers
We would like sellers to be able to reply to a sms message notification on their phone. We want what they text to appear as their reply on our site. Is this possible?
Say a seller checks their phone as sees that they have 5 notifications, is there a way they can reply to a specific message rather than the last one sent?
Any help would be much appreciated.
As you describe the use case, it is not possible. As you suspect, there's no way to link one inbound message to a particular outbound message. I'd suggest borrowing an idea from Twitter and including a Base-36 code in the notification. If a reply contains that code, then it's in response to that original message. For example...
Notitification: A seller is interested in your widget. LFLR
Reply: #LFLR Sorry. We are sold out of the widgets.
It will take a slight bit of effort from the sellers. But, then, they are motivated to sell. Using a Base-36 code will keep the number of characters to type under five even for a million plus messages.
I have noticed that certain SMS messages that I receive from companies come with a 'sender name'. eg. Just today I received an SMS from a number I have never used before (not im my contacts), however the senders name showed up as 'Adobe'. I get this from other companies too. eg Facebook, Google & Banking.
Is it similar to how a email server works? (you tell the server who you 'are' before you send the message) Is this the case with a carrier's cell tower?
I guess I'm wondering what the service is called and how it works? (ie. can you send 'header info' with SMS messages or is the cell tower just spoofing the message's 'sender number' and replacing it with characters?)
(hopefully this is the right place to ask this question...)
The MAP protocol (the one used for sending SMS messages among others) allow specifying either a phone number or an alphanumeric number as the sender.
AFAIK this cannot be set from your phone where the sender number will be always your public phone number but SMS Centers can allow sending such messages on other interfaces like the ones used by banks and the companies mentioned by you (usually using the SMPP or UCP protocoll).
Please note that some Telcos do not allow this kind of sender address in messages originated elsewhere but sent to their customers (or they don't allow it for everybody). They use SMS spam filters/firewalls called Home Routers for this.
Mobile communication in GSM, UMTS and LTE is governed by 3GPP.
The TP-OA field in SMS-DELIVER TPDU in an incoming SMS typically contains the number of a sender.
The network fills the TP-OA field with usually an MSISDN.
Please see 3GPP TS 23.040 Figure C.10.
But in case of a company name, TP-OA can be made alphanumeric using the Type of Number Information Element as 7-bit default alphabet
I suggest you to read 3GPP TS 24.011 and 23.040 to get an idea of how SMSes work.
However, I must point out that since a sender does not send TP-OA, it can't be easily spoofed.