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Fixes GCC virtual device running with UDP protocol #1462

merged 1 commit into from Jan 22, 2018


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commented Jan 16, 2018

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There are two issues that prevent GCC virtual device to successfully connect to the cloud with UDP:

  1. (main) The UDP socket is being bound to a multicast address, instead of or some interface address
  2. Cloud sockets use the same source UDP port, which prevents from running several virtual devices on the same host.


  1. Bind to
  2. Use ephemeral source port when creating UDP cloud socket

Steps to Test

Compile PLATFORM=gcc and test whether it can connect to the cloud with UDP protocol.

Example App



  • [CH10641]


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Fixes UDP cloud connection on GCC platform: socket needs to be bound …
…to and in order to run multiple clients on same host, an ephemeral port needs to be used, instead of a static one

@avtolstoy avtolstoy added the bug label Jan 16, 2018

@avtolstoy avtolstoy requested a review from m-mcgowan Jan 16, 2018

@@ -1104,8 +1104,13 @@ int spark_cloud_socket_connect()
ip_address_error = determine_connection_address(ip_addr, port, server_addr, udp);
if (!ip_address_error)
uint8_t local_port_offset = (PLATFORM_ID==3) ? 100 : 0;
sparkSocket = socket_create(AF_INET, udp ? SOCK_DGRAM : SOCK_STREAM, udp ? IPPROTO_UDP : IPPROTO_TCP, port+local_port_offset, NIF_DEFAULT);
#if PLATFORM_ID == 3

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m-mcgowan Jan 16, 2018


can we push this down to the HAL to avoid platform specifics in non-HAL code

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avtolstoy Jan 16, 2018

Author Member

I'd disagree. In that case all UDP sockets would use ephemeral ports. For some specific use-cases we might need to use a specific UDP port.

We have something similar on Electron:

Might be a good idea to move this block there.

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m-mcgowan Jan 16, 2018


What I mean is an option that lets the platform HAL decide the source port specifically for the cloud socket. Perhaps an option "UseEphemeralPortForCloud" that is sourced from the HAL, so there is no platform conditionality in the non-HAL code.

@m-mcgowan m-mcgowan added this to the 0.8.0-rc.2 milestone Jan 18, 2018

@m-mcgowan m-mcgowan merged commit 41c6f73 into develop Jan 22, 2018

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@m-mcgowan m-mcgowan deleted the fix/gcc-virtual-udp branch Jan 22, 2018

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