Hi there, I’m trying to port my Arduino sketch where I control a couple of servos over UDP on the local network. I need it to work even if it has no connection to the internet/cloud so I included Spark.disconnect(); in setup(). Is something wrong in my code? It compiles and flashes ok, the board b…

any reason you’re using UDP instead of TCP? do you need to stream (with no syn/ack)? essentially you’re gaining speed but losing reliability. there seems to be a lot of threads about udp not working, tcp works fine for me client and server.

I’m using UDP because I’m controlling robots with servos. Real time, “instant” response is a priority over reliability.

As @sej7278 said, the UDP libraries seems to have some bugs at the moment, so there are a few tricks to be aware of. I’ve heard that updating the CC3000 firmware may help with some issues, but I haven’t tried it myself. Here are some tips I learned getting my UDP to work, hopefully one of them might…

Thank you dpursell and erjm for the in depth info! It seems moving the Udp.begin to after the core got its SSID did the trick, then Spark.disconnect() worked as well. I tried #include “spark_disable_cloud.h” but it threw this error: In file included from …/inc/spark_wiring.h:30:0, from …/inc/app…

It seems I was wrong, since where I ran my code was on a router connected to internet, and trying it today on one where I cannot connect to the cloud then Spark.disconnect() is not put to work before after the core has connected to the cloud, as dpursell pointed out earier. So is it really at the m…

Hi @blind You can start without the cloud (and then connect and disconnect later) by using the include #include "spark_disable_cloud.h" You have to be careful because the cloud is connected at core start-up, you care guaranteed that the WiFi connection is up and running by the time your setup() f…

It seems that #include “application.h” was needed as well. Now it works :smile: And yes, I’m now making a check as pointed out by dpursell that UDP only connects when the core is connected to wifi. cheers!

Servo on local network

Troubleshooting

erjm June 4, 2014, 9:49pm 5

I just wanted to add to number 2. In addition to possibly getting a partial packet, it’s also possible to get more than one packet in the same read - either multiple whole packets or 1 or more whole plus a partial. Packet terminators, and careful parsing of the data you get are almost required; fixed packet sizes may be another option.

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Servo on local network

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