learning: NATS 101 paper and pub/sub paper completed with estate mapping, goldfish boundary, drills

learning/code_snippets/NATS-101.md

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+### NATS Access
+
+**Server Info**:
+```bash
+curl -s http://nats-dev.eachpath.local:30001/varz | jq .server_name
+```
+
+**Subscribe (nats cli)**:
+```bash
+nats sub -s nats://nats-dev.eachpath.local:30000 "dev.>"
+```
+
+**Publish (nats cli)**:
+```bash
+nats pub -s nats://nats-dev.eachpath.local:30000 "dev.test.hello" "Hello Nimmerverse!"
+```