Function app::app_network::send_sensor_data

pub fn send_sensor_data(val: &SensorValue) -> MynewtResult<()>

Compose a CoAP JSON message with the Sensor Key (field name) and Value in val and send to the CoAP server. The message will be enqueued for transmission by the CoAP / OIC Background Task so this function will return without waiting for the message to be transmitted. Return Ok() if successful, SYS_EAGAIN if network is not ready yet. For the CoAP server hosted at thethings.io, the CoAP payload should be encoded in JSON like this:

{"values":[
  {"key":"device", "value":"0102030405060708090a0b0c0d0e0f10"},
  {"key":"t",      "value":1715}
]}