A user reported that both IPv4 and IPv6 StartNetwork requests failed due to (2,209) for IPv4 and (2,211) for IPv6.  The IPv4 one corresponds to eQMIWDSInternalCallEndReasons_PDNIPv4CallThrottled and while the IPv6 one isn't documented, I'll bet it would actually be eQMIWDSInternalCallEndReasons_PDNIPv6CallThrottled.

If ModemManager detects either of these error codes from a Start Network response, it would be very interesting to call the equivalent of WDSGetPDNThrottleInfo() and read out the sWDSGetPDNThrottleInfoResponse_Info TLV to see how long the throttling will be active for.  If just for our debugging sanity.

// Structure to describe request TLV 0x01 for WDSGetPDNThrottleInfo()
struct sWDSGetPDNThrottleInfoRequest_Type
{
   eQMIWDSDataSystemNetworkTypes mTechnologyType;
};

// Structure to describe response TLV 0x10 for WDSGetPDNThrottleInfo()
struct sWDSGetPDNThrottleInfoResponse_Info
{
   UINT8 mThrottleInfoCount;

   struct sInfo
   {
      INT8 mIPv4Throttled;
      INT8 mIPv6Throttled;
      UINT32 mIPv4ThrottleTimeLeftInMilliseconds;
      UINT32 mIPv6ThrottleTimeLeftInMilliseconds;
      UINT8 mAPNNameLength;
   
      // This array must be the size specified by mAPNNameLength
      // char mAPNName[1];
   };

   // This array must be the size specified by mThrottleInfoCount
   // sInfo mInfos[1];
};