Develop Reference

HTTPS connection on wi-fi enabled Android Wear without phone tethering

I can't find any documentation on Android Wear that shows how to create an app that leverages the fact that some watches (like my Samsung Galaxy Gear) can now connect directly to the internet via wi-fi when the phone is not around.
I have a few apps that generate https requests to access a REST service and I would like to know if these can be directly called from a Wear app connected to wi-fi (no phone).
Similar questions don't seem to answer this:
Direct internet connection on Android Wear?
https://stackoverflow.com/questions/26062487/android-wi-fi-direct-persistent-connection
Android: Establish "Wi-Fi Direct" connection with networked devices
My tests on a Wear emulator tethered to an internet enabled Phone emulator show:
java.net.UnknownHostException: Unable to resolve host "api.xxx.com": No address associated with hostname
But of course there's no direct wi-fi connection on the watch emulator so my next step is to try on a real watch and phone.
My suspicion is that Android Wear's data API handles this transparently so direct http requests seem impossible.
Best, thanks in advance for your help.

Even if Android 5.1.1 support Wi-Fi Feature. Android Wear on Wi-Fi: Using a smartwatch without a phone nearby
You should stick to the Data Layer API, you cannot send http request directly from watch. Fetch internet data from the phone, then transfer it to watch with Data Layer API.
You can see this Does Android Wear support directly access the Internet?
And this document Always-on and Wi-Fi with the latest Android Wear update

From the last update its possible to make http requests over wifi using android wear. You can even connect a bluetooth headphone to it to use with some streaming app.
While on wifi, if your mobile phone is connected to the internet too (dont need to be the same wifi, can be even 3g) it will act the same way it would when bluetooth connected yo our phone, but with its own internet access.
This dont mean apps will change their behavior, because most of them are coded to make the requests from your phone, but if you have an app that make direct networks requests, it will send them from your watch without advising or needing your phone.
How to do networks requests on android wear
Just use the same network requests libraries you would use on a normal Android mobile application, like volley, retrofit, okhttp. The code is exactally the same, and by the way, any Android Mobile library works with Android Wear too.

Not able to connect to Bluetooth server and WiFi at same time

I have a Bluetooth device through which user can take photos. After taking the photos Bluetooth device hosts all the images on its own HTTP server (10.0.0.1), so that other devices can connect to server using Bluetooth and access photos from server using REST APIs which are exposed by server.
Steps to connect to Bluetooth device (Server)
Go to Setting, enable Bluetooth
Select Bluetooth device
Bluetooth device setting ("Paired Bluetooth device")
Select check box for Internet access.
Through this i am able to access Bluetooth server but my WiFi automatically gets disabled and I am not able to access internet.
If i uncheck "Internet access" check box in "Paired Bluetooth device setting" then I am able to connect to WiFi for internet access.
Is it possible to have both WiFi internet as well as Bluetooth internet at the same time? So that my app can connect to Bluetooth device to get the data (images) using REST APIs and post to remote server using WiFi.
I am using Nexus 7 tab for development which is running on Android 4.4.4.

1. ...so that other devices can connect to server using Bluetooth and access photos from server using REST APIs which are exposed by server
If the photos are on the server, devices can connect to it using wifi/internet also..right? To access the APIs and get the photos..
Why do you want other devices to connect to server using bluetooth to access photos from server using REST APIs
2. Is it possible to have both WiFi internet as well as Bluetooth internet at the same time?
Leave aside Bluetooth internet, there have been some issues related to Bluetooth and Wifi, even more with Bluetooth Low Energy and Wifi, many have been device specific.
Regarding what you are facing, there are issues on Android Open Source Project - Issue Tracker and other blogs also;
Issue 39995
Issue 41631
Nexus 5, Nexus 4 and Nexus 7 (2013) Android 4.4 Bluetooth Issues
[Although i haven't faced that issue in Nexus 5]
I have seen the same in MotoG also, turning on Bluetooth weakens the Wifi functionality.
In your case, considering nothing can be done with the device and its hardware,
you can check with the connections whether it happens intermittently, try to connect or send the request to server a couple of times.
3. ...app can connect to Bluetooth device to get the data (images) using REST APIs
If it can "connect" to the Bluetooth device, i suggest you try and get the images on the established connection rather than REST APIs. Simultaneous internet access through two different sources doesn't happen, even with the 3G and wifi :)
Just out of curiosity, when you are connected to the Bluetooth device, why do you want to add the necessity of internet to get the data?
Another approach, gets ugly but would work: Can you get the data that you need and ask the user to switch off the bluetooth so you can send the data..which you might need only on certain devices, if you separately get the data from the established bluetooth connection only

no dns via ipsec tunnel android 4.4.2 xperiaz C6603 racoon

I've setup a racoon server on my linux router. It was working ok with my xperiaz (C6603) road warrior. However after I applied the latest update to android 4.4.2 (firmware 10.5.A.0.230) it stopped working correctly. I have ping from the phone to each ip (local ip or internet) but when I use FQDN it can't be resolved. I can ping the phone from within my local network too. VPN is IPSec Xauth RSA. Checking with adb DNS server is correctly set:
getprop net.dns1
192.168.6.1
I also tried pushing the same ip as dns2 but no change. I also noticed that after closing the connection to the vpn server net.dns1 remains 192.168.6.1 however the phone is able to correctly resolve addresses. In few minutes it gets changed back to my 3g provider setting.
I tried to redirect all traffic through the tunnel via the advanced vpn setting (Forwarding routes = 0.0.0.0/0) and tried to set DNS statically via the same settings (DNS servers = 192.168.6.1). Even setting the DNS server to my provider's DNS addres didn't work which makes me think the problem is with the android itself.
DNS server is working as far as I can tell:
$ dig #192.168.6.1 dir.bg +short
194.145.63.12
Forwarding is enabled on my router so shouldn't be the problem. I've read about a bug in android but it's in android 2.x and seems to impact wifi connections.
Have you seen similar problems and as I'm not an expert with android and adb, can you tell me what commands are available in adb/shell to trace the problem? Phone is not rooted and it's not possible for the moment to root it.
UPDATE:
the tunnel is working ok when I connect via wifi hotspot. The problem appears to show only via my 3g carrier. Any ideas how to work around this?

After updating to 4.4.4 I still got the same problem. Further testing revealed that the problem is more likely to be in the Android rather than my 3g carrier. Over wifi the VPN worked flawlessly after using wifi tethering from another phone via the same provider it worked ok again so my 3g carrier isn't blocking anything.
Yesterday I finally rooted my phone and installed SDFix to restore full access to my SD card. Now VPN is working ok again even via 3g. I hope someone can confirm/reject that solution as I see no relation between vpn and sd card at all. However I experienced initially the problem with my update to 4.4.2 where Sony started to follow Google's policy about storage access.

Android Wi-fi AP hotspot - without internet

There are lots of post on SO regarding setting up AP (Hotspot) on android mobile. However, in all these cases, the AP is a conduit to the outside internet world. In my case, I just want a server application running over a mobile setup as an AP. And let all the client android mobiles connect to it, send their data and disconnect if they like. No internet connection is assumed (i.e, no gprs/3g etc).
My observations: If I setup a wifi AP (via settings -> tethering and portable hotspots) when it is also connected to GPRS, then another android phone can successfully connect to this AP and send the data to the application. However, if I disable the GPRS, even though the client shows that it is connected to the AP, it can't seem to send any data. It seems that an external internet connection is a necessity for the AP mode to work.
Is this understanding correct? Or am I setting something wrong?

I know that I am late to the party (more than 3 years late :) but I was searching for a solution to this problem and stumbled upon an easy workaround. I am using a Nexus 4 with Android 5.0.1 and I can easily configure my phone to use it as an Android Wi-fi AP hotspot - without internet. Just go to Settings / Data Usage and disable "Mobile data" option under the Mobile tab. Then enable the WiFi hotspot option as usual.
I was trying to get this working in order to play with a VirtualBox machine from VulnHub.com that asked for a Bridged Connection when I was commuting to work (no Internet, but with my laptop and my mobile phone I was able to make it :)

I think you have used the internet IPs in your code not the local IPs for communications,is'nt it?

I have the same use case and was looking for the same info as you are. I checked that some of the WiFi-only tablets do not even have a HotSpot setting. Even the devices that do have it, if I remove the SIM card, I cannot enable the HotSpot (I get a message asking me to insert a SIM first).
It looks like our use case is not supported by Android. Rather, the HotSpot feature was not designed with our use-case in mind. I mean, why would an end-user want to use an Android phone or tablet in a HotSpot mode if it didn't also provide outside connectivity?

is it ok to connect 2 devices concurrently to connect Bluetooth in Android?

Iam connecting 3G phone for my Android device for internet connection and another Socket(SPP) for CAN signal receiving.Whenever I manually connect to the Bluetooth tethering via 3G phone, i can browse internet perfectly and speed is good.Whenever programmatically connect to the 3G connection, i couldn't browse internet.i checked in shell and observing that in my mobile 'device is connected' message displayed and E symbol appears.No problem for me to connect Socket.But I got problem to use 3G phone.For this iam using APN/DUN mode.I checked both but no use.Is there any performance issue here or anything wrong to connect different devices by using Bluetooth API in android.Why this happends while connecting Mobile programmatically.Please give me guidance.
Regards,
Rajendar

Yes, you can have several open connections at a time.
In fact, I've used my hands-free bluetooth on my phone, as it is connected to my ELM327 SPP device streaming at full speed. I didn't notice any hiccups.
As for losing connectivity when you are connected to multiple devices, it's most likely an issue with the DUN provider you're using.
Also it's worth stating that, on Verizon/3g phones, when you use the phone as a phone, it suspends all 3g data services until the call is terminated.

The way L2CAP defines the LT_ADDR allows connecting devices up to 7. Your connection problems is something else.