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Original link: https://forums.developer.huawei.com/forumPortal/en/topicview?tid=0201327759501070037&fid=0101187876626530001
Introduction
Headset awareness is used to get the headset connecting status and to set barriers based on the headset connecting condition such as connecting, disconnecting or continue to be in any of this status.
Many of the musical applications are using this awareness features and providing very good experience to the users.
In this article, we are discussing about main classes and methods usage in HMS Headset awareness and equal classes and methods in GMS Headphone Awareness.
HeadsetBarrier
This HMS class features, barriers to be triggered while headset is connecting, disconnecting or continue to be in any of this status.
Following are the methods in HeadsetBarrier class.
connecting
disconnecting
keeping
All these methods will return Awareness barrier object.
connecting
After this barrier is added, when a headset is connected to a device, the barrier status is TRUE and a barrier event is reported. After 5 seconds, the barrier status changes to FALSE.
Syntax:
public static AwarenessBarrier connecting()
Code:
AwarenessBarrier headsetBarrier = HeadsetBarrier.connecting();
disconnecting
After this barrier is added, when a headset is disconnected, the barrier status is TRUE and a barrier event is reported. After 5 seconds, the barrier status changes to FALSE.
Syntax:
public static AwarenessBarrier disconnecting()
Code:
AwarenessBarrier headsetBarrier = HeadsetBarrier.disconnecting();
keeping
After you add this barrier with headset status CONNECTED and DISCONNECTED, when the headset is in specified state, the barrier status is TRUE and a barrier event is reported
Syntax:
public static AwarenessBarrier keeping(int headsetStatus)
Parameter must contain HeadsetStatus.CONNECTED or HeadsetStatus.DISCONNECTED, otherwise it will throw an IllegalArgumentException.
Code:
AwarenessBarrier headsetBarrier = HeadsetBarrier.keeping(HeadsetStatus.CONNECTED);
HeadsetStatusResponse
This HMS class provide the response to the request for obtaining the headset status. We can use the getHeadsetStatus method provided by CaptureClient to obtain headset connection status.
getHeadsetStatus
This method is used to obtain the headset connection status.
Syntax:
public HeadsetStatus getHeadsetStatus()
Code:
HeadsetStatus headsetStatus = headsetStatusResponse.getHeadsetStatus();
int status = headsetStatus.getStatus();
The status will get any of the three results HeadsetStatus.CONNECTED, HeadsetStatus.DISCONNECTED, HeadsetStatus.UNKNOWN and they have the values 1,0,-1 respectively.
References
https://developer.huawei.com/consumer/en/doc/development/HMS-Guides/awareness-headsets-dev
Related
Hi,
Next week my cable company will be rolling out WiFispots. They basically 'open' their clients wifi modems for other clients.
In effect, 1 cable modem will have 2 AP's: one will be private (and have max speed and lan networking capabilities of course) and one will be public (with capped speed per user).
As you will understand I only want to connect to my private network when I'm at home.
How can I set priority to my private network? (Repeatedly deleting and adding the public network is not an option imho).
I can't seem to find any setting which adresses this problem (running Omega v46, JB 4.2.2). Maybe it there somewhere, but if not is there any app which allows me to control this ?
Thanks for your replies!!
franatic08 said:
Hi,
Next week my cable company will be rolling out WiFispots. They basically 'open' their clients wifi modems for other clients.
In effect, 1 cable modem will have 2 AP's: one will be private (and have max speed and lan networking capabilities of course) and one will be public (with capped speed per user).
As you will understand I only want to connect to my private network when I'm at home.
How can I set priority to my private network? (Repeatedly deleting and adding the public network is not an option imho).
I can't seem to find any setting which adresses this problem (running Omega v46, JB 4.2.2). Maybe it there somewhere, but if not is there any app which allows me to control this ?
Thanks for your replies!!
Click to expand...
Click to collapse
There are many apps to handle this problem:
https://play.google.com/store/apps/details?id=org.za.flash.wifiprioritizer&hl=es
https://play.google.com/store/apps/details?id=com.hogdex.WifiRuler
Hi,
i'm developing a realtime audio streaming client for Android that reproduces audio frames from network.
The server samples, encodes and sends audio over UDP broadcast datagrams, and all works well... until client's screen is turned on!
When screen is turned off(i.e. device goes to sleep) problems begin. I can divide them into two categories (apparently the discriminating factors are ROM/Silicon vendor):
No audio at all: behaviour found mainly on Qualcomm/Samsung devices. The WLAN drivers filters bcast datagrams when device is in sleep mode. The filter can be turned off from WCNSS_qcom_cfg.ini.
This fix apparently solves the problem on Qualcomm-based phones. I have a Marvell-based Samsung device with the same behaviour, but I've not investigated yet.
Stuttering audio: Happened on MTK-based phones. Apparently devices drop parts of UDP broadcast datagrams in sleep mode. Problem can be "solved" running a thread that keeps interface awake by sending dummy UDP datagrams every 100ms, but i don't like this solution.
Is there anybody who knows a way to tweak WLAN drivers on MTK/Marvell/OtherVendors phones to remove power-saving filters and allow broadcast activities in sleep mode(something like WCNSS_qcom_cfg.ini for Qualcomms) ?
UPDATE: Galaxy Xcover 3 (SM-G389F) has an Exynos 3475 and uses bcmdhd wifi driver, that uses dhd_pkt_filter_enable param to enable/disalbe filter.
Unfortunately it's defined with permission 0 (so it can't be accessed from sysfs) and I haven't found a way to pass the parameter to the kernel at boot time.
Recompiled the kernel with permission set to 0644 and it works (can be triggered from /sys/module/dhd/parameters/dhd_pkt_filter_enable).
Bare with me I'm new.
Whilst researching the input event system in the kernel, I came across the need to access the input handlers that have already been registered with an IRQ lane given only the irq lane (just the integer). Is there a method to access ALL event handlers associated with an IRQ? I am looking to map each list of handlers from a given input device (say mouse) to each possible event that the device could make.
Overview
QUIC was introduced as an experiment to reduce the issues faced on TCP connection. TCP / TLS needs three round trips before the actual data is sent. QUIC reduces the round trips by working with UDP. With great features like eliminating head of line blocking, loss recovery over UDP by using multiplexed connections and congestion control, the protocol has evolved and is being widely used.
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Important terms
Before understanding HQUIC, its important to understand the open systems interconnection model which created by the International Organization for Standardization Here we are breaking down the communication system of computer networking into different parts as shown below.
Let us focus on the 4th layer that is the transport layer and it is responsible for end to end communication between the two devices. This includes taking data and breaking it down which is known as segments before giving it to the layer below it. This layer is also important for flow control and controlling errors
TCP:
TCP is a connection oriented communication protocol to transfer data between systems over the network.
In TCP data is transferred in the form of packets. Checks error and makes sure the data is delivered and order of the data is maintained
UDP:
UDP is a connectionless protocol which is faster and more efficient than TCP. If we compare UDP with TCP they are very similar butif you use this protocol, the data will be sent even if there are error or issues in the receiving end.
Security:
Despite efforts of keeping web users protected from attacks, few errors in the design and implementation of transport layer security have led to breaches. TLS is a cryptographic protocol that provides end to end communications security over networks and is extensively used for internet communications. Applications like Instant messaging, email and browsers use TLS to prevent eavesdropping, message forgery and tampering.
Securing data against attacks while it is in transit on a network is very important. To achieve this many protocols have been introduced and few of the popular protocols include S/MIME, SSH, SSL(Secure Socket Layer)/TLS.
Transport layer security schemes can address these problems by enhancing TCP/IP based network communication with confidentiality, data integrity, server authentication, and client authentication.
The security at this layer is mostly used to secure HTTP based web transactions on a network. However, it can be employed by any application running over TCP.
Transport layer security schemes can address these problems by enhancing TCP/IP based network communication with confidentiality, data integrity, server authentication, and client authentication.
The security at this layer is mostly used to secure HTTP based web transactions on a network. However, it can be employed by any application running over TCP.
SSL:
SSL ensures data is secured when it is transferred between browser and the server, SSL also encrypts the link between browsers and servers which ensures the data that is passed is secure from attacks
TLS AND SSL:
SSL and TLS are popular cryptographic protocols that are used to imbue web communications with integrity, security, and resilience against unauthorized tampering. PKI uses the TLS protocol to establish secure connections between clients and servers over the internet, ensuring that the information relayed is encrypted and unable to be read by an external third party.
Connections that are secured by TLS will indicate their secure status by displaying HTTPS (Hypertext Transfer Protocol Secure) in the address bar of web browsers, as opposed to just HTTP. While TLS is primarily used to secure client-server connection, it is also used to protect emails, VoIP calls, and other connections.
HQUIC
HQUIC supports QUIC which is a new transport protocol for the internet, which solves a number of transport-layer and application layer problems experienced by modern applications on the web.
QUIC reduces latency compared to that of TCP. On the surface, QUIC is very similar to TCP+TLS+HTTP/2 implemented on UDP. Because TCP is implemented in operating system kernels, and middlebox firmware, making significant changes to TCP is next to impossible. However, since QUIC is built on top of UDP, it suffers from no such limitations.
HQUIC kit gives your apps low latency, high throughput and secure and reliable communication capabilities. It supports the GQUIC protocol and provides very efficient methods to ensure congestion control in challenging network environments making sure your apps run fast and have higher throughput.
Advantages
Supports gQUIC and Cronet
Secure and reliable: Features to make communication network secure and reliable, it outperforms most protocols with its efficiency during poor or challenging network condition.
Reduced round trip delay: With great improvements to TCP and TLS protocols the amount of time it takes for the signal to be sent plus the amount of time it takes for an acknowledgement of the signal is reduced to 0. QUIC handshakes frequently require no roundtrips before sending the payload, as compared to 1-3 roundtrips that is taken by TCP TLS protocol. This is excellent for entertainment apps like online games and video streaming services.
No Head of line blocking: Head of line blocking was the major issue with HTTP2 which was running on top of TCP. Multiplexing without head-of-line blocking is a proven method for concurrent data transmission and it is supported by QUIC ensuring. The stream facing the packet loss issues does not affect the other streams.
Conclusion:
With the arrival of 5G, user’s expectation for excellent network connection has been very demanding. With Huawei’s intelligent congestion control algorithm to connect your apps faster and avoid packet loss, HQUIC Kit remains an excellent choice for apps to apply in a wide range of scenarios ranging from communications and gaming.
Stay tuned for part -2 we are going to use HQUIC kit to build an app to test the difference in performance.
How can I verify that the QUIC protocol is successfully enabled?
I recently encountered a problem with GPS positioning in my app.
My app needs to call the GPS positioning service and has been assigned with all required permissions. What's more, my app uses the Wi-Fi network and 4G network, and has no restrictions on power consumption and Internet connectivity. However, the GPS position and speed data obtained by calling standard Android APIs are very inaccurate.
Advantages and Disadvantages of Native Android Positioning
Native Android positioning provides two positioning modes: GPS positioning and network positioning. GPS positioning supports offline positioning based on satellites, which can work when no network is connected and achieve a high location precision. However, this mode will consume more power because the GPS positioning module on the device needs to be enabled. In addition, satellite data collection and calculation are time-consuming, causing slow initial positioning. GPS positioning needs to receive satellite signals, which is vulnerable to the influence of environments and geographical locations (such as weather and buildings). High-rise buildings, densely situated buildings, roofs, and walls will all affect GPS signals, resulting in inaccurate positioning.
Network positioning is fast and can instantly obtain the position anywhere, even in indoor environments, as long as the Wi-Fi network or cellular network is connected. It consumes less power but its accuracy is prone to interference. In places with few base stations or Wi-Fi hotspots or with weak signals, positioning accuracy is poor or unusable. This mode requires network connection for positioning.
Both modes have their own advantages and disadvantages. Traditional GPS positioning through native Android APIs is accurate to between 3 and 7 meters, which cannot meet the requirements for lane-level positioning. Accuracy will further decrease in urban roads and urban canyons.
Is there an alternative way for positioning besides calling the native APIs? Fortunately there is.
HMS Core Location Kit
HMS Core Location Kit combines the Global Navigation Satellite System (GNSS), Wi-Fi, and base station location functionalities to help the app quickly pinpoint the user location.
Currently, the kit provides three main capabilities: fused location, activity identification, and geofence. You can call relevant capabilities as needed.
Activity identification can identify user activity status through the acceleration sensor, cellular network information, and magnetometer, helping developers adapt their apps to user behavior. Geofence allows developers to set an area of interest through an API so that their apps can receive a notification when a specified action (such as leaving, entering, or staying in the area) occurs. The fused location function combines location data from GNSS, Wi-Fi networks, and base stations to provide a set of easy-to-use APIs. With these APIs, an app can quickly pinpoint the device location with ease.
Precise Location Results for Fused Location
As the 5G communications technology develops, the fused location technology combines all currently available location modes, including GNSS, Wi-Fi, base station, Bluetooth, and sensor.
When an app uses GNSS, which has to search for satellites before performing location for the first time, Location Kit helps make the location faster and increase the success rate in case of weak GNSS signals. Location Kit also allows your app to choose an appropriate location method as required. For example, it preferentially chooses a location mode other than GNSS when the device's battery level is low, to reduce power consumption.
Requesting Device Locations Continuously
The requestLocationUpdates() method provided by Location Kit can be used to enable an app to continuously obtain the locations of the device. Based on the input parameter type, the method returns the device location by either calling the defined onLocationResult() method in the LocationCallback class to return a LocationResult object containing the location information, or returning the location information in the extended information of the PendingIntent object.
If the app no longer needs to receive location updates, stop requesting location updates to reduce power consumption. To do so, call the removeLocationUpdates() method, and pass the LocationCallback or PendingIntent object that is used for calling the requestLocationUpdates() method. The following code example uses the callback method as an example. For details about parameters, please refer to description of LocationService on the official website.
1. Set parameters to continuously request device locations.
Code:
LocationRequest mLocationRequest = new LocationRequest();
// Set the interval for requesting location updates (in milliseconds).
mLocationRequest.setInterval(10000);
// Set the location type.
mLocationRequest.setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY);
2. Define the location update callback.
Code:
LocationCallback mLocationCallback;
mLocationCallback = new LocationCallback() {
@Override
public void onLocationResult(LocationResult locationResult) {
if (locationResult != null) {
// Process the location callback result.
}
}
};
3. Call requestLocationUpdates() for continuous location.
Code:
fusedLocationProviderClient
.requestLocationUpdates(mLocationRequest, mLocationCallback, Looper.getMainLooper())
.addOnSuccessListener(new OnSuccessListener<Void>() {
@Override
public void onSuccess(Void aVoid) {
// Processing when the API call is successful.
}
})
.addOnFailureListener(new OnFailureListener() {
@Override
public void onFailure(Exception e) {
// Processing when the API call fails.
}
});
4. Call removeLocationUpdates() to stop requesting location updates.
Code:
// Note: When requesting location updates is stopped, the mLocationCallback object must be the same as LocationCallback in the requestLocationUpdates method.
fusedLocationProviderClient.removeLocationUpdates(mLocationCallback)
// Define callback for success in stopping requesting location updates.
.addOnSuccessListener(new OnSuccessListener<Void>() {
@Override
public void onSuccess(Void aVoid) {
// ...
}
})
// Define callback for failure in stopping requesting location updates.
.addOnFailureListener(new OnFailureListener() {
@Override
public void onFailure(Exception e) {
// ...
}
});
References
HMS Core Location Kit official website
HMS Core Location Kit development guide