Issue title: Dasshio wifi problem
 Issue body: I have dasshio on 2 raspberry 3 b+

First master have a Lan connection and working good with dasshio 0.3.6 and HA 0.91.4

Second have a wifi connection to the same lan and never see any button it's all the time 
2019-04-18 10:20:34,530 | INFO | Reading config file: /data/options.json
2019-04-18 10:20:34,536 | INFO | Starting...
2019-04-18 10:20:34,537 | INFO | Starting sniffing...
but never see any button, while with 0.3.1 see when it pushed.

It 's a bug on new version ? 

Same config for both dasshio, try different button , nothing change.
try to set timeout more then 20, since to 40 nothing , don't see when they are pushed.
 Comments: 
 Comment 0: I have exactly the same problem dasshio v 0.3.6 and HA v 0.94.1 on a raspi 3B+.
Button presses are not being detected for different timeout settings.
{'source': 'GithubIssues', 'repo_name_with_owner': 'danimtb/dasshio', 'issue_id': 434650981, 'repo_stars': 164.0}