README: init

firmware/README.md

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+## Network
+
+### Setup
+
+Ethernet, IP: 192.168.1.26/24
+
+Use telnet or netcat to connect to port 23/tcp (telnet)
+
+### Reading ADC input
+
+Set report mode to `once` to obtain the single next value. Report mode
+will turn itself off after the next reading.
+
+Set report mode to `continuous` for a continuous stream of input data.
+
+The scope of this setting is per TCP session.
+
+
+### Commands
+
+| Syntax                                    | Function                            |
+| ---                                       | ---                                 |
+| `report`                                  | Report mode: once                   |
+| `report mode`                             | Show current report mode            |
+| `report mode <off or once or continuous>` | Set report mode                     |
+| `pwm <width> <total>`                     | Set PWM duty cycle to width / total |
+