82 lines
3.6 KiB
Markdown
82 lines
3.6 KiB
Markdown
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# Mesh IP Internal Networking example
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This example demonstrates how to use mesh to create a IP capable sub-network.
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As a demonstration all nodes publish their IP and their internal mesh layer to MQTT broker
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and uses internal communication at the same time
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## Functionality
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This example uses experimental NAT feature to translate addresses/ports from an internal subnet, that is created
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by the root node running a DHCP server. At the same time, the nodes communicate using low level mesh send/receive
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API to exchange data, such as routing table from root to all nodes and an event notification from one node
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to all other nodes in the mesh. As a demonstration, the same event is also published at the mqtt broker
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on a subscribed topic, so both internal mesh_recv() notification as well as mqtt data event are to be received.
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### Hardware Required
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This example can be executed on any platform board, the only required interface is WiFi and connection to internet.
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### Configure the project
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Open the project configuration menu (`idf.py menuconfig`) to configure the mesh network channel, router SSID, router password and mesh softAP settings.
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### Build and Flash
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Build the project and flash it to multiple boards forming a mesh network, then run monitor tool to view serial output:
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```
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idf.py -p PORT flash monitor
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```
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(To exit the serial monitor, type ``Ctrl-]``.)
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See the Getting Started Guide for full steps to configure and use ESP-IDF to build projects.
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## Example Output
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### Output sample from mesh node
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```
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I (7749) mesh_main: <MESH_EVENT_TODS_REACHABLE>state:0
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I (7749) mesh_main: <MESH_EVENT_ROOT_ADDRESS>root address:24:0a:c4:09:88:5d
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I (7899) wifi:AP's beacon interval = 307200 us, DTIM period = 2
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I (8809) mesh_main: <IP_EVENT_STA_GOT_IP>IP:10.0.0.3
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I (8819) mesh_main: Tried to publish layer:2 IP:10.0.0.3
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I (8819) mesh_mqtt: Other event id:7
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I (9189) MQTT_CLIENT: Sending MQTT CONNECT message, type: 1, id: 0000
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I (9469) mesh_mqtt: MQTT_EVENT_CONNECTED
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I (9569) mesh_mqtt: sent publish returned msg_id=42728
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I (9839) mesh_mqtt: MQTT_EVENT_SUBSCRIBED, msg_id=60327
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I (9919) mesh_mqtt: MQTT_EVENT_PUBLISHED, msg_id=42728
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...
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I (1218786) MESH_MQTT: sent publish returned msg_id=13978
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W (1218836) mesh_main: Key pressed!
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I (1218836) MESH_MQTT: sent publish returned msg_id=15808
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I (1218846) mesh_main: Sending to [0] 30:ae:a4:80:5b:18: sent with err code: 0
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I (1218906) MESH_MQTT: MQTT_EVENT_PUBLISHED, msg_id=13978
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I (1219016) MESH_MQTT: MQTT_EVENT_PUBLISHED, msg_id=15808
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I (1219366) MESH_MQTT: MQTT_EVENT_DATA
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TOPIC=/topic/ip_mesh/key_pressed
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DATA=24:0a:c4:09:88:5c
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I (1220036) mesh_main: Received Routing table [0] 30:ae:a4:80:5b:18
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I (1220036) mesh_main: Received Routing table [1] 24:0a:c4:09:88:5c
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```
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### Output sample from the root node
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```
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I (11957) mesh_main: <MESH_EVENT_TODS_REACHABLE>state:0
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I (11967) mesh_main: <MESH_EVENT_ROOT_ADDRESS>root address:24:0a:c4:09:88:5d
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I (11967) wifi:AP's beacon interval = 102400 us, DTIM period = 3
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I (12767) esp_netif_handlers: sta ip: 192.168.2.3, mask: 255.255.255.0, gw: 192.168.2.1
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I (12767) mesh_main: <IP_EVENT_STA_GOT_IP>IP:192.168.2.3
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...
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I (1253864) mesh_main: Received Routing table [0] 30:ae:a4:80:5b:18
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I (1253864) mesh_main: Received Routing table [1] 24:0a:c4:09:88:5c
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I (1253874) mesh_main: Sending routing table to [0] 30:ae:a4:80:5b:18: sent with err code: 0
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I (1253884) mesh_main: Sending routing table to [1] 24:0a:c4:09:88:5c: sent with err code: 0
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I (1253974) MESH_MQTT: MQTT_EVENT_PUBLISHED, msg_id=18126
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W (1254714) mesh_main: Keypressed detected on node: 24:0a:c4:09:88:5c
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I (1254814) MESH_MQTT: MQTT_EVENT_DATA
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TOPIC=/topic/ip_mesh/key_pressed
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DATA=24:0a:c4:09:88:5c
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```
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