一、开发板编译、功能介绍
根据官方文档编译烧录成功后,我们修改下官方例子,进行开发来实现websocket。
整体流程:开发板先自动寻找指定的wifi并且连接,连接成功后,通过websocket来与服务端连接,连接成功后,服务端就可以控制开发板开关灯。
二、代码编写以及功能实现
进入目录 device/xradio/xr806/ohosdemo/
修改BUILD.gn文件新增demo:app_demo
group(“ohosdemo”) {
deps = [
#“hello_demo:app_hello”,
#“iot_peripheral:app_peripheral”,
#“wlan_demo:app_WlanTest”,
#“LED:app_led”,
“demo:app_demo”,
]
}
创建demo目录 tree -L 1
├── BUILD.gn
└── main.c
BUILD.gn内容:
import("//device/xradio/xr806/liteos_m/config.gni")static_library("app_demo") {configs = []sources = ["main.c",]cflags = board_cflagsinclude_dirs = board_include_dirsinclude_dirs += ["//kernel/liteos_m/kernel/arch/include","//kernel/liteos_m/kernel/arch/include","//base/iot_hardware/peripheral/interfaces/kits","//utils/native/lite/include","//foundation/communication/wifi_lite/interfaces/wifiservice","//device/xradio/xr806/xr_skylark/project",]
}
main.c
#include <stdio.h>
#include <string.h>#include "ohos_init.h"
#include "kernel/os/os.h"
#include "iot_gpio.h"#include "wifi_device.h"
#include "wifi_hotspot.h"#include "net/libwebsockets/libwebsockets.h"#define WIFI_DEVICE_CONNECT_AP_SSID "um" //wifi名称
#define WIFI_DEVICE_CONNECT_AP_PSK "12345678" //wifi密码#define WEBSOCKET_HOST "192.168.10.21" //服务器IP
#define WEBSOCKET_PORT 9999 //服务器端口
#define WEBSOCKET_PATH "/ws" //websocket路径#define LIGHT_OPEN "/light/open" //开灯指令
#define LIGHT_CLOSE "/light/close" //关灯指令static OS_Thread_t g_main_thread;#define GPIO_ID_PA21 21#define MAX_PAYLOAD_SIZE 10 * 1024/*** 会话上下文对象,结构根据需要自定义*/
struct session_data {int msg_count;unsigned char buf[LWS_PRE + MAX_PAYLOAD_SIZE];int len;
};/*** 某个协议下的连接发生事件时,执行的回调函数** wsi:指向WebSocket实例的指针* reason:导致回调的事件* user 库为每个WebSocket会话分配的内存空间* in 某些事件使用此参数,作为传入数据的指针* len 某些事件使用此参数,说明传入数据的长度*/
int callback( struct lws *wsi, enum lws_callback_reasons reason, void *user, void *in, size_t len ) {struct session_data *data = (struct session_data *) user;switch ( reason ) {case LWS_CALLBACK_CLIENT_ESTABLISHED: // 连接到服务器后的回调lwsl_notice( "Connected to server ok!\n" );break;case LWS_CALLBACK_CLIENT_RECEIVE: // 接收到服务器数据后的回调,数据为in,其长度为lenlwsl_notice( "Rx: %s\n", (char *) in );if (strncmp(in, LIGHT_CLOSE, len)){//开灯操作IoTGpioSetOutputVal(GPIO_ID_PA21, 1);}else if (strncmp(in, LIGHT_OPEN, len)){//关灯操作IoTGpioSetOutputVal(GPIO_ID_PA21, 0);}break;case LWS_CALLBACK_CLIENT_WRITEABLE: // 当此客户端可以发送数据时的回调if ( data->msg_count < 3 ) {// 前面LWS_PRE个字节必须留给LWSmemset( data->buf, 0, sizeof( data->buf ));char *msg = (char *) &data->buf[ LWS_PRE ];data->len = sprintf( msg, "你好 %d", ++data->msg_count );lwsl_notice( "Tx: %s\n", msg );// 通过WebSocket发送文本消息lws_write( wsi, &data->buf[ LWS_PRE ], data->len, LWS_WRITE_TEXT );}break;}return 0;
}/*** 支持的WebSocket子协议数组* 子协议即JavaScript客户端WebSocket(url, protocols)第2参数数组的元素* 你需要为每种协议提供回调函数*/
struct lws_protocols protocols[] = {{//协议名称,协议回调,接收缓冲区大小"ws", callback, sizeof( struct session_data ), MAX_PAYLOAD_SIZE,},{NULL, NULL, 0 // 最后一个元素固定为此格式}
};//连接wifi,并且打印ip
static int wifiConnect()
{const char ssid_want_connect[] = WIFI_DEVICE_CONNECT_AP_SSID;const char psk[] = WIFI_DEVICE_CONNECT_AP_PSK;if (WIFI_SUCCESS != EnableWifi()) {printf("Error: EnableWifi fail.\n");return -1;}OS_Sleep(1);if (WIFI_STA_ACTIVE == IsWifiActive())printf("Wifi is active.\n");OS_Sleep(1);if (WIFI_SUCCESS != Scan()) {printf("Error: Scan fail.\n");return -1;}OS_Sleep(3);WifiScanInfo scan_results[30];unsigned int scan_num = 30;if (WIFI_SUCCESS != GetScanInfoList(scan_results, &scan_num)) {printf("Error: GetScanInfoList fail.\n");return -1;}WifiDeviceConfig config = { 0 };int netId = 0;int i;for (i = 0; i < scan_num; i++) {if (0 == strcmp(scan_results[i].ssid, ssid_want_connect)) {memcpy(config.ssid, scan_results[i].ssid,WIFI_MAX_SSID_LEN);memcpy(config.bssid, scan_results[i].bssid,WIFI_MAC_LEN);strcpy(config.preSharedKey, psk);config.securityType = scan_results[i].securityType;config.wapiPskType = WIFI_PSK_TYPE_ASCII;config.freq = scan_results[i].frequency;break;}}if (i >= scan_num) {printf("Error: No found ssid in scan_results\n");return -1;}if (WIFI_SUCCESS != AddDeviceConfig(&config, &netId)) {printf("Error: AddDeviceConfig Fail\n");return -1;}if (WIFI_SUCCESS != ConnectTo(netId)) {printf("Error: ConnectTo Fail\n");return -1;}printf("ConnectTo Success\n");OS_Sleep(15);return 0;
}void wifiDisconnect()
{printf("\n=========== DisConnect Test Start ===========\n");if (WIFI_SUCCESS != Disconnect()) {printf("Error: Disconnect Fail\n");return;}printf("Disconnect Success\n");if (WIFI_SUCCESS != DisableWifi()) {printf("Error: DisableWifi fail.\n");return;}printf("DisableWifi Success\n");printf("\n=========== DisConnect Test End ===========\n");
}static void MainThread(void *arg)
{int s32Ret = 0;s32Ret = wifiConnect();if (0 != s32Ret){printf("wifiConnect failed\n");return;}IoTGpioInit(GPIO_ID_PA21);IoTGpioSetDir(GPIO_ID_PA21, IOT_GPIO_DIR_OUT);// 用于创建vhost或者context的参数struct lws_context_creation_info ctx_info = { 0 };ctx_info.port = CONTEXT_PORT_NO_LISTEN;
// ctx_info.iface = NULL;ctx_info.protocols = protocols;ctx_info.gid = -1;ctx_info.uid = -1;// 创建一个WebSocket处理器struct lws_context *context = lws_create_context( &ctx_info );char address[] = WEBSOCKET_HOST;int port = WEBSOCKET_PORT;char addr_port[256] = { 0 };sprintf(addr_port, "%s:%u", address, port & 65535 );// 客户端连接参数struct lws_client_connect_info conn_info = { 0 };conn_info.context = context;conn_info.address = address;conn_info.port = port;conn_info.path = WEBSOCKET_PATH;conn_info.host = addr_port;conn_info.origin = addr_port;conn_info.protocol = protocols[ 0 ].name;// 下面的调用触发LWS_CALLBACK_PROTOCOL_INIT事件// 创建一个客户端连接struct lws *wsi = lws_client_connect_via_info( &conn_info );while (1) {// 执行一次事件循环(Poll),最长等待1000毫秒lws_service( context, 1000 );/*** 下面的调用的意义是:当连接可以接受新数据时,触发一次WRITEABLE事件回调* 当连接正在后台发送数据时,它不能接受新的数据写入请求,所有WRITEABLE事件回调不会执行*/lws_callback_on_writable( wsi );}// 销毁上下文对象lws_context_destroy( context );wifiDisconnect();
}
//连接websocket 进行开灯,关灯操作//wifi 连接
void demoMain(void) //(2)
{printf("websocket Test Start\n");if (OS_ThreadCreate(&g_main_thread, "MainThread", MainThread, NULL,OS_THREAD_PRIO_APP, 4 * 1024) != OS_OK){printf("[ERR] Create MainThread Failed\n");}
}SYS_RUN(demoMain);
三、效果演示
服务器用了网上下载的个WebssocketMan工具来模拟,网盘链接
链接:https://pan.baidu.com/s/1t82q_1evB5Zla-Hc1m4SYA
提取码:4pxu
登陆成功后打印显示:
登录后平台收到“/light/open”消息为点灯,“/light/close”为关灯
演示截图:
四、问题记录
在打开wifi例子,编译过程中遇到了分区叠加的错误,具体如图(感谢群里的朋友、社区以及论坛的帮助)
因为内存分配不够,官方文档描述
device\xradio\xr806\xr_skylark\project\image_cfg\readme.md
按照网上说的修改:
device\xradio\xr806\xr_skylark\project\demo\wlan_ble_demo\image\xr806\image_wlan_ble.cfg 分配不能够生效
最终解决:xr806\device\xradio\xr806\xr_skylark\project\demo\audio_demo\image\xr806\目录中将 image_auto_cal.cfg替换image.cfg