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APP INVENTOR硬件交互学习教程04——蓝牙控制继电器 - 创客硬件开发 - 清泛...
这节主要是设计一个APP，连接蓝牙模块，通过按钮控制继电器的打开和关闭。
一、硬件部分
二、板子程序
串口接收字符，并输出控制继电器
// 引脚定义
const int ledPin1 = 5;// the number of the LED pin
const int ledPin2 = &...
BLE &APP交互学习教程01——下发指令 - 创客硬件开发 - 清泛IT社区，为创新赋能！
BLE模块性价比高，无需配对就可以连接使用，从本节开始，我们着重来学习使用BLE控制和显示。
1.界面设计
2.逻辑设计
3.APP工程
4.下位机工程
{:8_381:}
Android check internet connection [duplicate]
...
in manifest,
<uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
Edit:
This method actually checks if device is connected to internet(There is a possibility it's connected to a network but ...
Unable to resolve host “” No address associated with hostname
... back on. It worked fine in the office, but as soon as I was off familiar wifi, I was getting the error. Sometimes it's the stupid things :|
– Karmic Coder
Aug 31 '14 at 21:34
...
How to check for an active Internet connection on iOS or macOS?
...ility.whenReachable = { reachability in
if reachability.connection == .wifi {
print("Reachable via WiFi")
} else {
print("Reachable via Cellular")
}
}
reachability.whenUnreachable = { _ in
print("Not reachable")
}
do {
try reachability.startNotifier()
} catch {
...
Run/install/debug Android applications over Wi-Fi?
... Android Studio plugin created to quickly connect your Android device over WiFi to install, run and debug your applications without a USB connected. Press one button and forget about your USB cable.
just install plugin Android WiFi ADB
Download and install Android WiFi ADB directly from
Intellij ...
内存管理内幕：动态分配的选择、折衷和实现 - C/C++ - 清泛网 - 专注C/C++及内核技术
...ve forward "size" bytes
ii) Go back to step 4
我们主要使用连接的指针遍历内存来寻找开放的内存块。这里是代码：
清单 6. 主分配程序
void *malloc(long numbytes) {
/* Holds where we are looking in memory */
void *current_location;
/* This is the...
Broadcast receiver for checking internet connection in android app
...action android:name="android.net.conn.CONNECTIVITY_CHANGE" />
Change in WiFi state:
<action android:name="android.net.wifi.WIFI_STATE_CHANGED" />
Just use one:
<action android:name="android.net.conn.CONNECTIVITY_CHANGE" />.
It will respond to only one action instead of two. See he...
Github (SSH) via public WIFI, port 22 blocked
I'm currently on a public WIFI spot and I'm unable to use SSH (they probably blocked that port). However, I need that connection to do a git push .
...
Adding a new network bearer to Android
...e to add new bearer(s) to Android (rooted/custom build), to be a peer with Wifi and GPRS.
1 Answer
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