JS server not recognized, continuing with build

Question

Environment

Windows 10

Npm 5.5.1

react-native-cli 2.0.1

react-native 0.50.3

Genymotion Google Nexus 7 - 6.0.0 API 23

Answer 1

Just changing port doesnt solve the issue, instead it creates more unless you also change the port from the device itself.

First, confirm if its the case:

$> netstat -aon|findstr “8081”

Now change it to run from a new Default Port

a) Change env variable on windows to set a new port for RN:

$> SET RCT_METRO_PORT=8083

This is used in RN to use as the default port, and if not set it defaults to 8081

b) Remove old reverse:

$> adb reverse –remove-all

c) Set new reverse port for the adb device:

$> adb reverse tcp:8083 tcp:8083

d) Change Dev Settings on the device from the default 8081 to 8083.

Run the app and then run input keyevent 82, now select Dev Settings > Debug Server host … > enter new url: localhost:8083

build and run again