How To Set Up Current Work Of Motiondetect

Posted by Riino on December 27, 2019 Embedded System Raspberry Pi STM32

1. How to set up current work: Dev.27th

1.1. Python side

  1. Establish a python file and copy:

what this file do: Receive the data from the IP and PORT you edit.

import socket

server = socket.socket(socket.AF_INET,socket.SOCK_STREAM)
server.bind(('',65431)) #YOU NEED EDIT HERE
server.listen(5)#possible sockets up to 5. 
while True:
    conn,addr = server.accept() 
    while True:
            data = conn.recv(1024)  
        except ConnectionResetError as e:
            print('Connect is shut down!')
  1. Use ipconfig or arp -a to check your device’s IP which will be the server, the port is fixed: 65431.
  2. Run python code first.

1.2. STM32 side

  1. establish an empty project in Mbed

    The template of wifi is recommend.(new program->mbed-example-wifi)

  2. You need those extra library for our specific STM32 board:

    • Sensor Library : import from
    • WIFI chip driver:
  3. If you use example-wifi program , you can find mbed_app.json, if you use empty one, create this file.

    change the content into:

        "config": {
                "help":"Options are internal,WIFI_IDW0XX1",
            "wifi-ssid": {
                "help": "WiFi SSID",
                "value": "\"esys305-Dlink\""
            "wifi-password": {
                "help": "WiFi Password",
                "value": "\"305305abcd\""
        "target_overrides": {
            "*": {
                "platform.stdio-convert-newlines": true

    Be aware of this SSID and Password, if you need to connect different wifi, change them.

  4. Replace your main.cpp into:

    Be aware of the function acc_server, you must change the target IP there

    The data collecting and formatting are also located in acc_server

    !!!the name of acc_server may be confusing , because here it actually opened a socket client

    /* WiFi & Sensor
     * Copyright (c) 2016 ARM Limited
     * Licensed under the Apache License, Version 2.0 (the "License");
     * you may not use this file except in compliance with the License.
     * You may obtain a copy of the License at
     * Unless required by applicable law or agreed to in writing, software
     * distributed under the License is distributed on an "AS IS" BASIS,
     * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     * See the License for the specific language governing permissions and
     * limitations under the License.
    #include "mbed.h"
    #include "TCPSocket.h"
    #include "TCPServer.h"
    #include "stm32l475e_iot01_gyro.h"
    #include "stm32l475e_iot01_accelero.h"
    #define SCALE_MULTIPLIER    0.004
    DigitalOut led(LED1);
    DigitalOut errled(LED3);
    WiFiInterface *wifi;
    const char *sec2str(nsapi_security_t sec)
        switch (sec) {
            case NSAPI_SECURITY_NONE:
                return "None";
            case NSAPI_SECURITY_WEP:
                return "WEP";
            case NSAPI_SECURITY_WPA:
                return "WPA";
            case NSAPI_SECURITY_WPA2:
                return "WPA2";
            case NSAPI_SECURITY_WPA_WPA2:
                return "WPA/WPA2";
            case NSAPI_SECURITY_UNKNOWN:
                return "Unknown";
    int scan_demo(WiFiInterface *wifi)//this function is to scan all hotspots nearby(up to 15),sometimes it will fail.
        WiFiAccessPoint *ap;
        int count = wifi->scan(NULL,0);
        if (count <= 0) {
            printf("scan() failed with return value: %d\n", count);
            return 0;
        /* Limit number of network arbitrary to 15 */
        count = count < 15 ? count : 15;
        ap = new WiFiAccessPoint[count];
        count = wifi->scan(ap, count);
        if (count <= 0) {
            printf("scan() failed with return value: %d\n", count);
            return 0;
        for (int i = 0; i < count; i++) {
            printf("Network: %s secured: %s BSSID: %hhX:%hhX:%hhX:%hhx:%hhx:%hhx RSSI: %hhd Ch: %hhd\n", ap[i].get_ssid(),
                   sec2str(ap[i].get_security()), ap[i].get_bssid()[0], ap[i].get_bssid()[1], ap[i].get_bssid()[2],
                   ap[i].get_bssid()[3], ap[i].get_bssid()[4], ap[i].get_bssid()[5], ap[i].get_rssi(), ap[i].get_channel());
        printf("%d networks available.\n", count);
        delete[] ap;
        return count;
    void acc_server(NetworkInterface *net)//collect data and send via socket
        TCPServer socket;
        TCPSocket* client;*/
        TCPSocket socket;
        //SocketAddress addr("",65431);
        SocketAddress addr("",65431);
        nsapi_error_t response;
        int16_t pDataXYZ[3] = {0};
        float pGyroDataXYZ[3] = {0};
        char recv_buffer[9];
        char acc_json[64];
        int sample_num = 0;//counter
        // Open a socket on the network interface, and create a TCP connection to addr
        response =;
        if (0 != response){
            printf("Error opening: %d\n", response);
        response = socket.connect(addr);
        if (0 != response){
            printf("Error connecting: %d\n", response);
        while (1){
            //++sample_num; cancle the counter
            float x = pDataXYZ[0]*SCALE_MULTIPLIER, y = pDataXYZ[1]*SCALE_MULTIPLIER, z = pDataXYZ[2]*SCALE_MULTIPLIER;
            float gx= pGyroDataXYZ[0]*SCALE_MULTIPLIER, gy = pGyroDataXYZ[1]*SCALE_MULTIPLIER, gz = pGyroDataXYZ[2]*SCALE_MULTIPLIER;
            int len = sprintf(acc_json,"{\"x\":%f,\"y\":%f,\"z\":%f,\"gx\":%f,\"gy\":%f,\"gz\":%f,\"s\":%d}",(float)((int)(x*10000))/10000,
                                            (float)((int)(y*10000))/10000, (float)((int)(gx*10000))/10000,(float)((int)(z*10000))/10000,(float)((int)(gy*10000))/10000,(float)((int)(gz*10000))/10000, sample_num);
            response = socket.send(acc_json,len);
            printf("sent %s",acc_json);
            if (0 >= response){
                printf("Error seding: %d\n", response);
    int main()
        float sensor_value = 0;
        int16_t pDataXYZ[3] = {0};
        float pGyroDataXYZ[3] = {0};
        printf("init completed\n");
        printf("Mbed OS version %d.%d.%d\n\n", MBED_MAJOR_VERSION, MBED_MINOR_VERSION, MBED_PATCH_VERSION);
        wifi = WiFiInterface::get_default_instance();
        if (!wifi) {
            printf("ERROR: No WiFiInterface found.\n");
            errled=1;//connect error
            return -1;
        int count = scan_demo(wifi);
        if (count == 0) {
            printf("No WIFI APs found - can't continue further.\n");
            return -1;
        printf("\nConnecting to %s...\n", MBED_CONF_APP_WIFI_SSID);
        if (ret != 0) {
            printf("\nConnection error: %d\n", ret);
            errled=1;//connect error
            return -1;
        printf("MAC: %s\n", wifi->get_mac_address());
        printf("IP: %s\n", wifi->get_ip_address());
        printf("Netmask: %s\n", wifi->get_netmask());
        printf("Gateway: %s\n", wifi->get_gateway());
        printf("RSSI: %d\n\n", wifi->get_rssi());

    How to run

  5. run python program on your device (laptop or pi)
  6. use mbed to run c++ program, or simply power the STM32 board
  7. You should read data from py terminal or serial monitor of mbed.