IPv6 multicasting stopped to work in Android for [email protected] #6
Comments
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Do you mean the public method to get the value of |
Correct. |
I suspect the |
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You can call |
In other words speaking - "do it yourself". Anyway I will. |
vikulin
changed the title
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@wlynxg I was suspecting the issue was caused by incorrect API Level values in |
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What do you mean by IPv6 multicast stops working? package mobile
import (
"fmt"
"log"
"net"
"net/netip"
"github.com/wlynxg/anet"
)
func Run() {
allifaces, err := anet.Interfaces()
if err != nil {
log.Printf("get interfacess error: %s!\n", err)
}
for _, iface := range allifaces {
addrs, err := anet.InterfaceAddrsByInterface(&iface)
if err != nil {
log.Printf("get [%s] addrs error: %s\n", iface.Name, err)
} else {
log.Printf("success get [%s] addrs: %s\n", iface.Name, addrs)
}
for _, addr := range addrs {
parseAddr, err := netip.ParsePrefix(addr.String())
if err != nil {
continue
}
if parseAddr.Addr().Is4() || parseAddr.Addr().IsMulticast() {
continue
}
addr := fmt.Sprintf("[%s%%%s]:0", parseAddr.Addr().String(), iface.Name)
_, err = net.Listen("tcp", addr)
if err != nil {
log.Printf("listen %s error: %s\n", addr, err)
} else {
log.Printf("success listen %s!\n", addr)
}
}
}
}It works well on Android12 and Android14, and the running results are as follows: |
@vikulin Could you provide some minimal code (ideally the entire project) that reproduces the problem? I suspect the issue is not device-specific but rather depends on some context in which you call
@vikulin Do you mean this specific patch vikulin@99b8955 fixes the issue or is it the entire set of changes you made in that branch vikulin/anet@a79b5ca...99b8955 that fixes it? I'm asking because in vikulin/anet@a79b5ca...41ff359 (everything except the last commit) you basically disable I think that if caching is the problem, it may be worth to try checking the result of |
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We can wait for him to provide an environment that can reproduce the problem and then consider how to solve it. |
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@wlynxg Please learn what is "IPv6 Multicast". The code which was affected hasn't been debugged clearly but what I noticed in logs most probably socket write failed and did not send multicast beacon.
Yes, that's correct. |
Well, at least we know the problem isn't related to @vikulin do you have the
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Yes, it does: |
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I tried to build https://github.com/RiV-chain/crispa-android/tree/8f85b6303ae038815c19b7338cef3773f6653499 with https://github.com/RiV-chain/RiV-mesh/tree/23ab7e81764ed6bf18d88f9245986c7a14783476 and then ran it on my Android device (LinageOS 20 based on AOSP 13). To confirm that the sending of multicast messages was not working, I tried to dump all incoming multicast packets using Wireshark from my laptop in the same network. And there were no incoming multicast messages. So I decided to switch back to https://github.com/wlynxg/anet/tree/v0.0.4 and retest And I can see multicast messages from my phone in Wireshark. For some reason, the outcome is completely opposite to what @vikulin is experiencing. |
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@bobrofon you ran incorrect Android client. Check this project out: |
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The same result with CupLink. Multicasting works on my phone with https://github.com/wlynxg/anet/tree/v0.0.4 but with https://github.com/vikulin/anet/tree/99b8955b2cffbbff21367f7ecb17231aaa5dfe19 it doesn't (I see in Wireshark how my phone joins the multicast group but never sends anything). anet v0.0.4: anet 99b8955: @vikulin Which version of Android are you using? Can you show logcat from your device? |
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@bobrofon Thank you for the debugging. I synced code (tag v0.4.7.16) with yggdrasil implementation for the multicasting related code where [email protected] is used. As result multicasting is not working and this is why I was updating link_tcp.go. I got following errors in Android CupLink client: This is exactly what does yggdrasil in latest develop branch with anet lib update. Error occurs here: RiV-mesh: Yggdrasil: It seems like |
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@bobrofon @wlynxg confirmed the issue in 
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Can you provide your Android phone model and Android version number? |
Android 14, Pixel 7a |
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@wlynxg I suppose the |
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I have fixed the issue and my change isn't related to anet itself. Thanks All!. Closing the issue. |
See my comment here:
e684438#r145827457
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