No and NoCan it be easily done? Is it just a matter of setting up a special listening address and port?
Note that the address range should be 192.168.???.???
Setting up the communication medium and what that handles are two separate things.
hamilc, gooogles about batman-adv and IPv6hamilc wrote: ↑Mon Jul 16, 2018 3:19 amCan I program two pi so listen to a specific (but different) 168.100.???.??? adresss and have them communicate directly without having to go through a router or to install hotspot software? It seems like this should be possible. Can it be easily done? Is it just a matter of setting up a special listening address and port?
Correct. For a wired network; just connect one device's RJ45 to the other device's RJ45. They can both communicate between themselves, either or both can be listening for connections and data from the other.
You can think of it this way. With Ethernet, you physically connect a cord, before any TCP/IP can work between the units. Creating a wireless Access Point with one Pi and connecting the other to it, is the equivalent of connecting that physical cable.hamilc wrote: ↑Mon Jul 16, 2018 1:03 pmI still don't understand. lets forget that we are using the Wi-Fi "layer" and think of only using TCP/IP by itself. I am sure that using the basic TCP/IP routines one can communicate between Is without a router. I think when I mentioned WiFi that the conversation meant that we HAD to use Wi-Fi routines. Lets forget Wi-Fi and think about using the TCP/IP routines. There must be some software to do this.
Think about the old serial RS-232 days. There was no master or slave here. Both were always receiving/listening and then when one wanted to transmit then they did so.
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