gateway_example

# ESP-TDMA-MAC Gateway (Master) Example

This example demonstrates how to set up the **Master (Gateway)** role using the `esp_tdma_mac` component. 

The Gateway acts as the central coordinator in the TDMA network. It automatically initializes Wi-Fi (in STA mode) and ESP-NOW, registers the broadcast peer, and broadcasts synchronisation beacons every 10 ms (default). It also handles node registration and decrypts incoming sensor data packets from registered nodes using AES-128 encryption.

The slot step is derived from the beacon period and the highest node ID in use, and is broadcast
in every beacon so the nodes derive their own offsets from it. It can be changed at runtime with
`esp_tdma_master_set_target_node_count()`, and the new geometry needs no re-provisioning. This
example also signs every beacon with a CMAC key; nodes provisioned with the same key verify it and
drop forged beacons.

## How to Use

### 1. Build and Flash

Configure and compile the project using ESP-IDF:
```bash
idf.py set-target esp32s3
idf.py build
idf.py flash monitor
```

### 2. Expected Output

Upon startup, you should see Wi-Fi and ESP-NOW initialization logs:
```text
I (xxx) esp_tdma_mac: Wi-Fi initialized in STA mode by esp_tdma_mac component
I (xxx) esp_tdma_mac: ESP-NOW initialized by esp_tdma_mac component
```

When a node (Slave) boots up and initiates the registration handshake, you will see registration and incoming data logs:
```text
I (xxx) gateway: Node 1 registered and admitted to the schedule
I (xxx) gateway: Received payload from node 1, seq=100, battery=100%, len=12
```