How to connect expo go app through docker devcontainer - docker

Question

problem
cannot connect with my expo app to the expo simulation
setup
set up a devcontainer with vscode's extension.
login into my expo account
successful build
expo go and laptop in the same network
has worked before with last linux pc
node -e 'console.log(os.networkInterfaces())' results:
{
lo: [
{
address: '127.0.0.1',
netmask: '255.0.0.0',
internal: true,
cidr: '127.0.0.1/8',
...
}
],
eth0: [
{
address: '172.17.0.3',
netmask: '255.255.0.0',
internal: false,
cidr: '172.17.0.3/16',
...
}
]
I tried
setting REACT_NATIVE_PACKAGER_HOSTNAME to host's ip
without it gives me a link from its eth0
open mac's firewall to vscode and docker
turn off mac's firewall
switch to tunnel connection
but this gives an error for another question later
tried posting and currently waiting responses here while exercising my google-fu
my environment
mac os 12.3 (monterey)
docker 4.7.1
devcontainer from microsoft's nodejs (alpine with node)
expo cli version: v5.3.2
previous environment
ubuntu 21.04
docker ~4.7.1
devcontainer from microsoft's nodejs (alpine with node)
expo cli version: ~5.3.2
to reproduce
setup a devcontainer
"VARIANT": "14-bullseye"
"features": {"git": "latest","aws-cli": "latest","desktop-lite": "latest","python": "latest" }
npm i -g expo-cli
expo init a new sample project
expo start
try to connect expo go via the qr
no errors on expo-cli but go-app java.net.ConnectException: Failed to connect to /192.x.x.x:19000
if not working like me:
close expo
export REACT_NATIVE_PACKAGER_HOSTNAME=192.168.1.xxx xxx is host's lan ip address
expo start
try connecting with expo go app via qr
no errors on expo-cli but go-app java.net.ConnectException: Failed to connect to /192.x.x.x:19000