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https://github.com/lucasdietrich/stm32f429zi-getting-started-zephyr-mbed-tls

Getting started with stm32f429zi (Nucleo f429zi) with Zephyr RTOS : Async HTTP Server, DHCP, UDP, ...
https://github.com/lucasdietrich/stm32f429zi-getting-started-zephyr-mbed-tls

iot stm32f429zi zephyr-rtos

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Getting started with stm32f429zi (Nucleo f429zi) with Zephyr RTOS : Async HTTP Server, DHCP, UDP, ...

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README 

        
# IMPORTANT :



As this is only a getting started project, there will be no more updates on it. However I'm currently working on a real application using Zephyr RTOS and mbedTLS (and for real) : [stm32f429zi-caniot-controller](https://github.com/lucasdietrich/stm32f429zi-caniot-controller)



- Branch *http_async* of this git is abandonned but persistent HTTP connections feature is "properly" implemented in C in the *caniot-controller* project.



---



**this repo contains pictures and big O files, it is only a getting started project :)**



Pages:

- HTTP : [docs/http_server/http_server.md](./doc/http_server/http_server.md)

- HTTP Ascync : [docs/http_server/http_async.md](./doc/http_server/http_async.md)



---



# Nucleo f429zi



Current system model



![system_model.png](./pics/system_model.png)



Log



![log_dhcp_sntp_datetime.png](./pics/log_dhcp_sntp_datetime.png)



UDP discovery - v1



![udp_discovery_v1.png](./pics/udp_discovery_v1.png)



# Questions, todo & Open Points



## FileSystem / MQTT CLIENT / HTTP SERVER



## Get the MAC addr (can we change it ?)



See how to get a static IP, does DHCP give a rdm IP or does the MAC addr change



- 02:80:e1:b4:be:77

- 02:80:e1:35:7e:07



MAC address seems to change (only the 3 last bytes).

The 3 first bytees stay the sames



We can fix theses values in the prj.conf file



```

CONFIG_ETH_STM32_HAL_RANDOM_MAC=n

CONFIG_ETH_STM32_HAL_MAC3=77

CONFIG_ETH_STM32_HAL_MAC4=77

CONFIG_ETH_STM32_HAL_MAC5=77

```



After mac address is not random anymore 



First 3 bytes changed in NOT RANDOM MAC mode (security ? lock ?)

```

00:80:e1:77:77:77

```



## Singleton - Design pattern



- Description : https://h-deb.clg.qc.ca/Sujets/Divers--cplusplus/CPP--Singletons.html

- Interesting article about Singleton for Embedded : https://www.embeddedrelated.com/showarticle/691.php

- Other article : https://lonkamikaze.github.io/2019/10/05/embedded-cxx-singletons



## Choose different port than 5000 (which is DNS port)



## UDP discovery, return ip, time, app name, version, and other stats



Python *scapy* library to test udp discovery : `from scapy.all import *` : `send(IP(dst="192.168.10.255")/UDP(dport=5000)/Raw(load="hello"))`



## Interesting : Workqueues



Read : https://docs.zephyrproject.org/1.9.0/kernel/threads/workqueues.html



## make it more robust



## HTTP SERVER test : CONFIG_NET_BUF_POOL_USAGE



## see how to use/create static variables & set class singleton, set port and other parameters



## file system fs_read / fs_write



## set time



## efficient way to handle errors



![./errors.h.png](./pics/errno.h.png)



## k_work_init to sync tasks



- Workqueues : https://docs.zephyrproject.org/1.9.0/kernel/threads/workqueues.html



## Threading Zephyr



Zephyr Scheduling : Interesting and important : https://docs.zephyrproject.org/1.12.0/kernel/threads/scheduling.html

- Threading API : https://docs.zephyrproject.org/latest/reference/kernel/threads/index.html

- Scheduling API : https://docs.zephyrproject.org/latest/reference/kernel/scheduling/index.html



Polling API : https://docs.zephyrproject.org/1.9.0/kernel/other/polling.html



About `main` thread : https://docs.zephyrproject.org/1.12.0/kernel/threads/system_threads.html



## Flash & RAM



```cpp

const static uint32_t DATA[450000];  // stored in flashed

```



```cpp

static uint32_t DATA[30000]; // stored in RAM

```



# Info



## Link to : https://os.mbed.com/platforms/ST-Nucleo-F429ZI/



## DTS file - for hw.cpp

 

*.dts* file : `nucleo_f429zi.dts` located here : `.platformio\packages\framework-zephyr\boards\arm\nucleo_f429zi`



- *LED0*, *LED1*, *LED2* : leds *green*, *blue*, *red*

- *SW0* : user button



## .c -> .cpp



In order to use *.cpp* files rather than *.c* files, completely delete the *.pio* (build) directory.



## SNTP



Zephyr https://docs.zephyrproject.org/latest/reference/networking/sntp.html#group__sntp_1ga945936e5164bbd959cfa666ceacdac13



## Meaning of NET_EVENT_ETHERNET_CARRIER_ON & NET_EVENT_ETHERNET_CARRIER_OFF ?



## Zephyr Kernel API



https://docs.zephyrproject.org/1.9.0/api/kernel_api.html#_CPPv319k_delayed_work_initP14k_delayed_work16k_work_handler_t



## Zephyr minimal configuration



- for IoT

- 32 bits ?

- min 8kb on ram



Comparison Free RTOS & Zephyr RTOS & mbed os : https://www.reddit.com/r/embedded/comments/in7rjy/zephyr_vs_freertos_for_embedded_iot_project/



---



# Issues :



Find issues in the code by typing : `ISSUE 001` for example.



## 001. undefined reference to *net_config_init_app*

When disabling : `CONFIG_NET_CONFIG_AUTO_INIT=n`



And when we call manually `net_config_init_app(NULL, "app");` or `net_config_init("app", NET_CONFIG_NEED_IPV4, 1000);` the linker says `undefined reference to net_config_init`.



Even when including `#include ` and all the other headers : 



```

#include 

#include 

#include 

#include 

```



Maybe cmake, missing binaries, configuration ?



Waiting, I'm setting `CONFIG_NET_CONFIG_AUTO_INIT=y` and don't calling these functions.



SOLUTION:

Add `CONFIG_NET_CONFIG_SETTINGS=y`



### 002.  os: CONFIG_MINIMAL_LIBC_MALLOC_ARENA_SIZE is 0



Need



### CONFIG_LOG_BUFFER_SIZE=1024 (default)



Increase *CONFIG_LOG_BUFFER_SIZE* size if log message drops as following



![log_message_dropped.png](./pics/log_message_dropped.png)