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QuestionHelp me to understand "hosts" file and socket communication via bluetooth Pin
Vaclav_29-Dec-19 8:54
Vaclav_29-Dec-19 8:54 
I have read several tutorials how to manipulate (Linux) "hosts" file.

I need to "connect" Raspberry Pi to PC , using bluetooth.
I really do not care which is server or client end of the connection.

I like to test each piece of hardware by doing local loopback first.
I would like to run such local loopback on each end of the connection separately , using separate code application. I do have the basic - socket / bind / read / write working.


I understand that local "loopback" IP is in range 127.0.0.0 to 127.255.255.255.

1. Can I "bind" created socket to name "localhost" to run such local loopback - using 32 bit address?
2. How can I do same using 128 bit address, ip6 protocol ? AKA how to put ip6 "name" into my C++ code ? ::1 has "multiple" names
3. Is doing "remote loopback" feasible?
Ideally - instruct LOCAL hardware to connect via socket to REMOTE hardware running in "remote loopback"? Or in another words - is there REMOTE loopback IP ? Or do I have to have remote software to emulate such loopback?

4. The communication / socket from (local) RPi woudl "connect / bind " to which IP on remote (PC) hardware?
5. Similar - the communication / socket from (local) PC woudl bind to which IP on now remote - RPi hardware?

Item 5 and 6 would be in "simplex" communication - each one way only - at least for now.

I have not found a decent description of ip6 "names" .
For example -what does ip6-allnodes accomplish ?

Here is a copy of RPi hosts file

127.0.0.1       localhost
::1             localhost ip6-localhost ip6-loopback
ff02::1         ip6-allnodes
ff02::2         ip6-allrouters

127.0.1.1       ARM
10.0.1.76       RPI


And here is hosts file on PC

127.0.0.1       localhost
127.0.1.1       z-desktop

# The following lines are desirable for IPv6 capable hosts
::1     ip6-localhost ip6-loopback
fe00::0 ip6-localnet
ff00::0 ip6-mcastprefix
ff02::1 ip6-allnodes
ff02::2 ip6-allrouters


Minor comments / questions
The RPi has only ONE bluetooth hardware , but in hosts it has TWO IP addresses / names
The PC has THREE bluetooth hardware, but blutooth manager will identify only TWO.

Appreciate any constructive comments.
AnswerRe: Help me to understand "hosts" file and socket communication via bluetooth Pin
Richard MacCutchan30-Dec-19 1:18
mveRichard MacCutchan30-Dec-19 1:18 
GeneralRe: Help me to understand "hosts" file and socket communication via bluetooth Pin
Vaclav_30-Dec-19 8:09
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GeneralRe: Help me to understand "hosts" file and socket communication via bluetooth Pin
Vaclav_1-Jan-20 6:07
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GeneralRe: Help me to understand "hosts" file and socket communication via bluetooth Pin
Richard MacCutchan1-Jan-20 6:22
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GeneralRe: Help me to understand "hosts" file and socket communication via bluetooth Pin
Vaclav_1-Jan-20 7:29
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GeneralRe: Help me to understand "hosts" file and socket communication via bluetooth Pin
Vaclav_2-Jan-20 5:04
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GeneralRe: Help me to understand "hosts" file and socket communication via bluetooth Pin
Richard MacCutchan2-Jan-20 5:45
mveRichard MacCutchan2-Jan-20 5:45 
GeneralRe: Help me to understand "hosts" file and socket communication via bluetooth Pin
Vaclav_2-Jan-20 7:22
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GeneralRe: Help me to understand "hosts" file and socket communication via bluetooth Pin
Richard MacCutchan2-Jan-20 7:35
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GeneralRe: Help me to understand "hosts" file and socket communication via bluetooth Pin
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