Non-printable characters in SSID can be returned by Wiser Heat Hub

[TobyLL]

I have just installed wiserHomeAssistantPlatform - thank you very much for the work you have put into it. I did have one issue that stopped it from working, as follows:

After installation and configuration, it didn't seem that anything worked, as nothing appeared on the dashboard. Digging around in the logs returned this error:

2020-03-26 20:18:22 ERROR (MainThread) [homeassistant.setup] Error during setup of component wiser
Traceback (most recent call last):
  File "/usr/src/homeassistant/homeassistant/setup.py", line 170, in _async_setup_component
    hass, processed_config
  File "/config/custom_components/wiser/__init__.py", line 69, in async_setup
    data = WiserHubHandle(hass, config, host, secret)
  File "/config/custom_components/wiser/__init__.py", line 116, in __init__
    self.wiserhub = wiserHub(self.ip, self.secret)
  File "/usr/local/lib/python3.7/site-packages/wiserHeatingAPI/wiserHub.py", line 101, in __init__
    self.refreshData()  # Issue first refresh in init
  File "/usr/local/lib/python3.7/site-packages/wiserHeatingAPI/wiserHub.py", line 191, in refreshData
    self.hubIP), headers=self.headers, timeout=TIMEOUT).json()
  File "/usr/local/lib/python3.7/site-packages/requests/models.py", line 890, in json
    self.content.decode(encoding), **kwargs
  File "/usr/local/lib/python3.7/site-packages/simplejson/__init__.py", line 525, in loads
    return _default_decoder.decode(s)
  File "/usr/local/lib/python3.7/site-packages/simplejson/decoder.py", line 370, in decode
    obj, end = self.raw_decode(s)
  File "/usr/local/lib/python3.7/site-packages/simplejson/decoder.py", line 400, in raw_decode
    return self.scan_once(s, idx=_w(s, idx).end())
simplejson.errors.JSONDecodeError: Invalid control character '\x18' at: line 1 column 1185 (char 1184)

After a bit of hacking to print out the actual body of the response, the following was appearing in the binary string returned by the Wiser Heat Hub:

{"SSID":"\r!","Channel":6,"SecurityMode":"WPA_WPA2_PSK","RSSI":-91},{"SSID":"\x13!","Channel":6,"SecurityMode":"WPA_WPA2_PSK","RSSI":-94}

and according to https://jsonlint.com this isn't valid JSON.

I have solved this on my local copy by taking the body of the response, removing non-printable characters, and then passing that to json.loads(). I'll raise a PR for that shortly.