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

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

1.1. Python side

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(('192.168.1.238',65431)) #YOU NEED EDIT HERE
server.listen(5)#possible sockets up to 5.
while True:
    conn,addr = server.accept()
    print(conn,addr)

    while True:
        try:
            data = conn.recv(1024)
            print('recive:',data.decode())

        except ConnectionResetError as e:
            print('Connect is shut down！')
            break
    conn.close()

Use ipconfig or arp -a to check your device’s IP which will be the server, the port is fixed: 65431.
Run python code first.

1.2. STM32 side

establish an empty project in Mbed
The template of wifi is recommend.(new program->mbed-example-wifi)
You need those extra library for our specific STM32 board:
- Sensor Library : import from http://developer.mbed.org/teams/ST/code/BSP_B-L475E-IOT01/
- WIFI chip driver: https://github.com/ARMmbed/wifi-ism43362.git

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": {
         "wifi-shield":{
            "help":"Options are internal,WIFI_IDW0XX1",
            "value":"WIFI_ISM43362"
        },
        "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.

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
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * 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:
        default:
            return "Unknown";
    }
}

int scan_demo(WiFiInterface *wifi)//this function is to scan all hotspots nearby(up to 15),sometimes it will fail.
{
    WiFiAccessPoint *ap;

    printf("Scan:\n");

    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("192.168.43.176",65431);
    SocketAddress addr("192.168.1.238",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 = socket.open(net);
    if (0 != response){
        printf("Error opening: %d\n", response);
    }
    response = socket.connect(addr);

    if (0 != response){
        printf("Error connecting: %d\n", response);
    }


    socket.set_blocking(1);
    while (1){
        led=1;
        //++sample_num; cancle the counter
        BSP_ACCELERO_AccGetXYZ(pDataXYZ);
        BSP_GYRO_GetXYZ(pGyroDataXYZ);


        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);
        }
        wait(0.1);
        led=0;


    }


    socket.close();
}







int main()
{
    led=0;
    errled=0;
    float sensor_value = 0;
    int16_t pDataXYZ[3] = {0};
    float pGyroDataXYZ[3] = {0};

    BSP_GYRO_Init();
    BSP_ACCELERO_Init();
    printf("init completed\n");

#ifdef MBED_MAJOR_VERSION
    printf("Mbed OS version %d.%d.%d\n\n", MBED_MAJOR_VERSION, MBED_MINOR_VERSION, MBED_PATCH_VERSION);
#endif

    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);
    int ret = wifi->connect(MBED_CONF_APP_WIFI_SSID, MBED_CONF_APP_WIFI_PASSWORD, NSAPI_SECURITY_WPA_WPA2);
    if (ret != 0) {
        printf("\nConnection error: %d\n", ret);
        errled=1;//connect error
        return -1;
    }

    printf("Success\n\n");
    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());




    acc_server(wifi);

    wifi->disconnect();
}

How to run

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