# goTool

Host-side UART client for the Powerpod **master** ESP.

Full system documentation (roles, ESP-NOW, framing, protobuf): [`../main/README.md`](../main/README.md).

## Usage

```bash
cd goTool
go mod tidy
go run . -port /dev/ttyUSB0 version
go run . -port /dev/ttyUSB0 clients
```

| Flag | Default | Description |
|------|---------|-------------|
| `-port` | (required) | Serial port on master UART (GPIO2/3 adapter) |
| `-baud` | `921600` | Must match firmware `UART_BAUD_RATE` |

### Commands

| Command | UART payload | Description |
|---------|--------------|-------------|
| `version` | `0x03` | Prints `version` and `git_hash` from firmware |
| `clients` | `0x04` | Lists slaves registered on the master via ESP-NOW |
| `unicast-test` | `0x07` | Sends ESP-NOW unicast test to one slave (`-client`, `-seq`) |

`clients` requires slaves to have responded to master discover broadcasts first.

```bash
go run . -port /dev/ttyUSB0 unicast-test -client 16 -seq 42
```

On success the slave serial log should show `UNICAST TEST OK from master … seq=42`.

Example output:

```
clients (2):
  [0] id=42 mac=aabbccddeeff ver=1 available=true used=false last_ping=250 last_success_ping=250
```

## Regenerate protobuf

```bash
protoc --go_out=./pb --go_opt=paths=source_relative \
  --go_opt=Muart_messages.proto=powerpod/gotool/pb \
  -I ../main/proto ../main/proto/uart_messages.proto
```