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Make our own multicast group and join it. #137

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Merged
merged 1 commit into from
Oct 4, 2017
Merged

Make our own multicast group and join it. #137

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14 changes: 10 additions & 4 deletions mesh_led_control_example.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -29,8 +29,7 @@ static void blink();
static void update_state(uint8_t state);
static void handle_message(char* msg);

// mesh local multicast to all nodes
#define multicast_addr_str "ff02::1"
#define multicast_addr_str "ff15::810a:64d1"
#define TRACE_GROUP "example"
#define UDP_PORT 1234
#define MESSAGE_WAIT_TIMEOUT (30.0)
Expand Down Expand Up @@ -180,7 +179,7 @@ static void receive() {
// there was nothing to read.
something_in_socket=false;
}
}
}
}

static void handle_socket() {
Expand All @@ -192,8 +191,15 @@ static void init_socket()
{
my_socket = new UDPSocket(network_if);
my_socket->set_blocking(false);
my_socket->bind(UDP_PORT);
my_socket->bind(UDP_PORT);
my_socket->setsockopt(SOCKET_IPPROTO_IPV6, SOCKET_IPV6_MULTICAST_HOPS, &multicast_hops, sizeof(multicast_hops));

ns_ipv6_mreq_t mreq;
memcpy(mreq.ipv6mr_multiaddr, multi_cast_addr, 16);
mreq.ipv6mr_interface = 0;
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Why zero? Can it change?

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Zero means "default". Best we can do as we don't have visibility of Nanostack interface IDs.

There is a PR going through to add a generic NSAPI for this - ARMmbed/mbed-os#4820. That is intending to use interface address instead.


my_socket->setsockopt(SOCKET_IPPROTO_IPV6, SOCKET_IPV6_JOIN_GROUP, &mreq, sizeof mreq);

if (MBED_CONF_APP_BUTTON != NC) {
my_button.fall(&my_button_isr);
my_button.mode(PullUp);
Expand Down