title: MQTT-SN over Serial Wire (Bluetooth, CAN, RS485, ...)
body: <p>I found this Answer <a href="https://stackoverflow.com/questions/33483943/rsmb-mqtt-sn-bluetooth/34175195#34175195">RSMB MQTT-SN &amp; Bluetooth</a>, but I am not sure if this is really the correct answer at all.</p>
  
  <p>So a second Question - I am new to Stackoverflow so I cannot comment directly.</p>
  
  <p>...</p>
  
  <p>Are you sure that a forwarder is really needed here? I read the MQTT-SN spec and for me it looks like MQTT-SN is for UDP and UDP is connectionless. So I think it is possible so simulate UDP over serial for one point to point connection.</p>
  
  <p>So why not...</p>
  
  <p>mqtt-sn client---serial-->> any radio &lt;&lt;--serial---mqtt-sn serial brigdge</p>
  
  <p>And on the MQTT-SN serial bridge side I can also run a Gateway which connects to a real MQTT broker of my choice.</p>
  
  <p>I read that out from figure 1 in the specs. I do not clearly understand what´s the benefit of a forwarder is? And when should someone use it and so on ...</p>
  
  <p>thanks. Mathias</p>