client: added dedicated dev node start commands for local client connection debugging, added networking debugging section in developer README

Author: holgerd77

packages/client/README.md

@@ -337,6 +337,27 @@ to help contributors better understand how the project is organized.
 
 ## Developer
 
+### Debugging
+
+#### Networking
+
+For debugging on networking issues two npm start scripts exist to set up two local client nodes to test networking connection flow.
+
+Start a first client listening on the default port and using the default data directory with:
+
+```shell
+DEBUG=devp2p:*,devp2p:*.* npm run client:start:dev1
+DEBUG=devp2p:*,devp2p:*.* npm run client:start:dev1 -- --datadir=datadir-dev1
+```
+
+Then take the enode address from the started client instance (use `127.0.0.1` for the IP address) and start a second client with:
+
+```shell
+DEBUG=devp2p:* npm run client:start:dev2 -- --bootnodes=enode://[NODE_ID]@127.0.0.1:30303
+```
+
+This second client is using './datadir-dev2' for its data directory.
+
 ### Diagram Updates
 
 To update the structure diagram files in the root folder open the `client.drawio` file in [draw.io](https://draw.io/), make your changes, and open a PR with the updated files. Export `svg` and `png` with `border` `width=20` and `transparency=false`. For `png` go to "Advanced" and select `300 DPI`.

packages/client/package.json

@@ -19,6 +19,8 @@
     "prepublishOnly": "npm run build && npm run test",
     "bundle": "webpack",
     "client:start": "ts-node bin/cli.ts",
+    "client:start:dev1": "ts-node bin/cli.ts --discDns=false --discV4=false --bootnodes",
+    "client:start:dev2": "ts-node bin/cli.ts --discDns=false --discV4=false --transports=rlpx --port=30304 --datadir=datadir-dev2",
     "coverage": "nyc npm run test && nyc report --reporter=lcov",
     "docs:build": "typedoc --tsconfig tsconfig.prod.json",
     "lint": "ethereumjs-config-lint",