Humidity Sensor -> MQTT -> SignalK (data conversion)

[awwbaker@yahoo.com]

I have a sensor collecting humidity data and using the following to send to MQTT.

      pubString = String(dht.getHumidity()/100); 
      memset(msg, 0, sizeof(msg));
      pubString.toCharArray(msg, pubString.length()+1); 
      client.publish("SensorHumidity",msg);

I am trying to display the humidity data in Wilhelm but it is being recognized, correctly as a string in Wilhelm rather than a float. How do I send the data so it ends up as being float in SignalK and hence Wilhelm as well? I have data getting on to Wilhelm, I suspect I am just not doing it the right way. I am NOT familiar with a whole JSON structure but do I need to go to that extent to accomplish what I am trying?  A shove in right direction would be appreciated. Signed Newbie, but learning

What are you using to send the data? If it's an esp then this library might help , I stole some of it and send signalk direct so no problems with the data. Had the same issues with mqtt sending the data as a string.

https://github.com/mxtommy/EspSigK

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First of all....complete NUBE!!! That said, I have put together an Mega 2560 Arduino based board which is measuring solar panel current, voltage as well as a temperature and humidity sensor. I am using

WiFiEspClient espClient;
PubSubClient client(espClient);

to send the data to MQTT broker on OpenPlotter running on a RPi. Using the interface there I mapped MQTT messages to SignalK. I then started up Wilhelm used generic controls to display....all working and very cool. Then tried to use Temperature and Ratio Controls. The Wilhelm author Mr Bender discovered I was sending strings rather than numerical values through MQTT. 

I tried building the EspSigK example but I suspect because of the Mega 2560 getting build errors that are currently beyond my skill level to resolve. (error on some includes in EspSigK.h) At this point not sure if I should abandon the MQTT and go after the EspSigK? Any suggestions GREATLY appreciated. VR Anthony