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esp-idf/examples/mesh/ip_internal_network
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Harshit Malpani bbbede07d0
fix(partition_table): Check partition size for type APP 
The size of partition of type APP should be multiple of 4 KB. Partition
generation tool now make this as a mandatory requirement. This is
minimum flash erase size. If the size of the APP type partition is not
aligned to 4 KB then the last erase operation could go beyond the allocated
partition and hence may fail. This issue would only be observed when the
firmware size grows very close to the allocated partition size, and hence
causing the OTA update to fail.

For already deployed devices on-field with the size of APP partition not
aligned to flash sector boundary, it is best to ensure that firmware
size always remains within the lower 4 KB boundary of the total
allocated space. While migrating to ESP-IDF 5.3 release, partition table
for an existing project can be adjusted accordingly for the build to
succeed.

Found during discussion in https://github.com/espressif/esp-idf/pull/12460
2023-12-11 10:14:57 +05:30
..
main all: Removes unnecessary newline character in logs 2023-06-09 03:31:21 +08:00
CMakeLists.txt tools: Increase the minimal supported CMake version to 3.16 2022-06-01 06:35:02 +00:00
partitions.csv fix(partition_table): Check partition size for type APP 2023-12-11 10:14:57 +05:30
README.md lwip: Support IPv6 only mode 2023-02-27 08:53:34 +01:00
sdkconfig.defaults examples, esp_mesh: Fix internal ip mesh example to use transmit wrap function 2020-11-09 20:32:58 +01:00

README.md

Supported Targets ESP32 ESP32-C3 ESP32-C6 ESP32-S2 ESP32-S3

Mesh IP Internal Networking example

This example demonstrates how to use mesh to create a IP capable sub-network. As a demonstration all nodes publish their IP and their internal mesh layer to MQTT broker and uses internal communication at the same time

Functionality

This example uses experimental NAT feature to translate addresses/ports from an internal subnet, that is created by the root node running a DHCP server. At the same time, the nodes communicate using low level mesh send/receive API to exchange data, such as routing table from root to all nodes and an event notification from one node to all other nodes in the mesh. As a demonstration, the same event is also published at the mqtt broker on a subscribed topic, so both internal mesh_recv() notification as well as mqtt data event are to be received.

Note, that this example in not supported for IPv6-only configuration.

Hardware Required

This example can be executed on any platform board, the only required interface is WiFi and connection to internet.

Configure the project

Open the project configuration menu (idf.py menuconfig) to configure the mesh network channel, router SSID, router password and mesh softAP settings.

Build and Flash

Build the project and flash it to multiple boards forming a mesh network, then run monitor tool to view serial output:

idf.py -p PORT flash monitor

(To exit the serial monitor, type Ctrl-].)

See the Getting Started Guide for full steps to configure and use ESP-IDF to build projects.

Example Output

Output sample from mesh node

I (7749) mesh_main: <MESH_EVENT_TODS_REACHABLE>state:0
I (7749) mesh_main: <MESH_EVENT_ROOT_ADDRESS>root address:24:0a:c4:09:88:5d
I (7899) wifi:AP's beacon interval = 307200 us, DTIM period = 2
I (8809) mesh_main: <IP_EVENT_STA_GOT_IP>IP:10.0.0.3
I (8819) mesh_main: Tried to publish layer:2 IP:10.0.0.3
I (8819) mesh_mqtt: Other event id:7
I (9189) MQTT_CLIENT: Sending MQTT CONNECT message, type: 1, id: 0000
I (9469) mesh_mqtt: MQTT_EVENT_CONNECTED
I (9569) mesh_mqtt: sent publish returned msg_id=42728
I (9839) mesh_mqtt: MQTT_EVENT_SUBSCRIBED, msg_id=60327
I (9919) mesh_mqtt: MQTT_EVENT_PUBLISHED, msg_id=42728
...
I (1218786) MESH_MQTT: sent publish returned msg_id=13978
W (1218836) mesh_main: Key pressed!
I (1218836) MESH_MQTT: sent publish returned msg_id=15808
I (1218846) mesh_main: Sending to [0] 30:ae:a4:80:5b:18: sent with err code: 0
I (1218906) MESH_MQTT: MQTT_EVENT_PUBLISHED, msg_id=13978
I (1219016) MESH_MQTT: MQTT_EVENT_PUBLISHED, msg_id=15808
I (1219366) MESH_MQTT: MQTT_EVENT_DATA
TOPIC=/topic/ip_mesh/key_pressed
DATA=24:0a:c4:09:88:5c
I (1220036) mesh_main: Received Routing table [0] 30:ae:a4:80:5b:18
I (1220036) mesh_main: Received Routing table [1] 24:0a:c4:09:88:5c

Output sample from the root node

I (11957) mesh_main: <MESH_EVENT_TODS_REACHABLE>state:0
I (11967) mesh_main: <MESH_EVENT_ROOT_ADDRESS>root address:24:0a:c4:09:88:5d
I (11967) wifi:AP's beacon interval = 102400 us, DTIM period = 3
I (12767) esp_netif_handlers: sta ip: 192.168.2.3, mask: 255.255.255.0, gw: 192.168.2.1
I (12767) mesh_main: <IP_EVENT_STA_GOT_IP>IP:192.168.2.3
...
I (1253864) mesh_main: Received Routing table [0] 30:ae:a4:80:5b:18
I (1253864) mesh_main: Received Routing table [1] 24:0a:c4:09:88:5c
I (1253874) mesh_main: Sending routing table to [0] 30:ae:a4:80:5b:18: sent with err code: 0
I (1253884) mesh_main: Sending routing table to [1] 24:0a:c4:09:88:5c: sent with err code: 0
I (1253974) MESH_MQTT: MQTT_EVENT_PUBLISHED, msg_id=18126
W (1254714) mesh_main: Keypressed detected on node: 24:0a:c4:09:88:5c
I (1254814) MESH_MQTT: MQTT_EVENT_DATA
TOPIC=/topic/ip_mesh/key_pressed
DATA=24:0a:c4:09:88:5c