Expected Behavior

Better control over GAIN for LimeSDR device (not mini).
Please use example of the SDR Console Gain Control.

Actual Behavior

Signal really weak on the low frequencies even if GAIN is maximized.

Steps To Reproduce

1. Go to URH
2. Click on Spectrum Analyzer
3. Refresh device, select sampling rate to 2.5M and Gain to above middle point (also tested maxim

As code on master is Python3 only depndency on six should be removed and affected code needs to be adapted to use Python3 constructs.

Is your feature request related to a problem? Please describe.
I couldn't find OpenThread's configurations description in https://openthread.io/reference. I think it helpful to have a centered place to introduce all OpenThread configuration and usage.

Describe the solution you'd like
Add a generated configurations page.

Hello,
I'm tryna use nginx to proxy pass http://my.domain.com to http://localhost:2501 where is running Kismet integrated WebUI (http://my.domain.com is a example). Basically, the client would call http port 80 and nginx will do the proxy job to port 2501.

But instead of getting the WebUI properly, I get the following page:
![image](https://user-images.githubusercontent.com/4443

Note: These issues are for bugs and feature requests for the helper libraries.
If you need help or support, please email help@twilio.com and one of our experts
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I think this is bug as it can produce errors in XML, which I feel the library should handle. I realize that likely the verbs should not be mixed up, but I feel this would likely be a common mistake. The documtation

It would be great if there's documentation on how TrebleShot sending works. I am interested in developing a desktop app for TrebleShot ? It would be great if there's docs on how sending, discovering and receiving works.

Fix statement condition on "Install custom OpenWISP 2 Python packages" task in pip.yml:

TASK [openwisp.openwisp2 : Install custom OpenWISP 2 Python packages] **********
[DEPRECATION WARNING]: evaluating 'openwisp2_python_packages' as a bare 
variable, this behaviour will go away and you might need to add |bool to the 
expression in the future. Also see CONDITIONAL_BARE_VARS configur

Reserved for Google Code-In 2020.

Depends on openwisp/openwisp-utils#98.

Use the decorators mentioned in the issue linked above to silence the output of noisy tests.

From issue #432:

I'd also suggest updating the JavaDoc to better indicate the API behavior: From what I've observed, it only cares about the Date part of the DateSent parameter. (Trying to get the last 30s of messages returns the full day's worth of messages.) I think making a note of that in the JavaDoc would help out new users.

Acceptance Criteria:

1. Reproduce the above behavior
2. Up

Reserved for Google Code-In 2020.

Depends on openwisp/openwisp-utils#98.

Use the decorators mentioned in the issue linked above to silence the output of noisy tests.

IpAddresses are not assigned to interfaces unless the module of the type Ipv4 is named "ipv4".

Reproduce

Create a node where the ipv4 submodule is not called ipv4. All interfaces are then not assigned an ip address.

Modified Example from https://inet.omnetpp.org/docs/users-guide/ch-network-nodes.html#custom-network-nodes

//NetworkNodeExample.ned
module NetworkNodeExample
{