Here is the Spark Core port of Adafruit MDNS library. The library provides the ability to setup a name for the Spark Core and resolve it. We can name the Core anything we want, the library will append “.local” to the name and we can access the Core using the URL “name.local”.
The sample application names the Core as “myspark”. If the MDNS is setup correctly then it creates a TCPServer on port 80. The Core can be accessed using the URL “http://myspark.local”. The server simply prints a test message.
Requirement
For Mac OSX support is built in through Bonjour already.
I have tried this out with both an iOS device and a Mac and it is not working for me. I have a couple Bonjour explorer type programs and none can see the core. I see the request packets on wireshark but I don’t see responses. The core eventually goes into flashing cyan and reboots–I am not sure why.
Is there something else you did to get this to work?
@bko, the following code works for me when I am connected to same network.
// This #include statement was automatically added by the Spark IDE.
#include "mdns/mdns.h"
#define LISTEN_PORT 7
TCPServer echoServer(LISTEN_PORT);
MDNSResponder mdns;
char szIP[64];
bool isStarted;
char szHTML[] = "<html><body><p>Spark Core and MDNS Working :)</p></body></html>";
TCPServer server = TCPServer(80);
void setup() {
// Retrieve and convert to integer format
IPAddress addr = Network.localIP();
uint32_t ip = (addr[0] * 16777216) + (addr[1] * 65536) + (addr[2] * 256) + (addr[3]);
// Begin MDNS
isStarted = mdns.begin("myspark", ip);
// If started, set the variable to IP address of the Spark Core
// else set error message
if(isStarted){
sprintf(szIP, "%d.%d.%d.%d (%u)", addr[0], addr[1], addr[2], addr[3], ip);
server.begin();
}
else{
sprintf(szIP, "Error starting MDNS.");
}
Spark.variable("mdnsstatus", szIP, STRING);
}
void loop() {
// If we started successfully, then wait for the client to connect
// else do nothing
if(isStarted){
mdns.update();
TCPClient client = server.available();
if (client){
client.write(szHTML);
client.flush();
client.stop();
}
}
delay(2000);
}
I experienced this issue while developing and when I forgot to add the mdns.update(); in loop. Once it is added it is working on Mac, I didn’t test on Windows. Will that be the issue in your case?. Also could you please check the mdnsstatus variable?
OK, that must be it. I had pulled your example out from your github. If you haven’t already updated it, that might be good to do. I will try it again tonight.
Yes, I updated example the code already, by mistake I pushed the example code with out the mdns.update() first, then I corrected it later. I should be more careful next time
Hello krvarma,it is this example is suitable for Spark Photon either? I vertifyed your example in the particle build and it showed some errors.Can you help me ?thanks!
mdns.cpp:136:54: error: 'socket' was not declared in this scope
int soc = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
mdns.cpp:141:5: error: 'sockaddr_in' was not declared in this scope
sockaddr_in address;
mdns.cpp:141:17: error: expected ';' before 'address'
sockaddr_in address;
mdns.cpp:142:13: error: 'address' was not declared in this scope
memset(&address, 0, sizeof(address));
mdns.cpp:144:34: error: 'htons' was not declared in this scope
address.sin_port = htons(5353);
mdns.cpp:145:59: error: 'htonl' was not declared in this scope
address.sin_addr.s_addr = htonl(ip2int(224, 0, 0, 251)); ^
mdns.cpp:147:20: error: 'sockaddr' was not declared in this scope
if (bind(soc, (sockaddr*) &address, sizeof(address)) < 0) {
mdns.cpp:147:29: error: expected primary-expression before ')' token
if (bind(soc, (sockaddr*) &address, sizeof(address)) < 0) {
mdns.cpp:147:56: error: 'bind' was not declared in this scope
if (bind(soc, (sockaddr*) &address, sizeof(address)) < 0) {
mdns.cpp:146:15: warning: unused variable 'len' [-Wunused-variable]
socklen_t len = sizeof(address);
mdns.cpp: In member function 'void MDNSResponder::update()':
mdns.cpp:167:3: error: 'timeval' was not declared in this scope
timeval timeout;
mdns.cpp:167:11: error: expected ';' before 'timeout'
timeval timeout;
mdns.cpp:168:3: error: 'timeout' was not declared in this scope
timeout.tv_sec = 0;
mdns.cpp:170:3: error: '_types_fd_set_cc3000' was not declared in this scope
_types_fd_set_cc3000 reads
mdns.cpp:170:24: error: expected ';' before 'reads'
_types_fd_set_cc3000 reads;
mdns.cpp:171:12: error: 'reads' was not declared in this scope
FD_ZERO(&reads); ^
mdns.cpp:172:24: error: 'reads' was not declared in this scope
FD_SET(_mdnsSocket, &reads);
mdns.cpp:173:55: error: 'select' was not declared in this scope
select(_mdnsSocket + 1, &reads, NULL, NULL, &timeout);
mdns.cpp:180:55: error: 'recv' was not declared in this scope
int n = recv(_mdnsSocket, &buffer, sizeof(buffer), 0);
mdns.cpp: In member function 'void MDNSResponder::sendResponse()':
mdns.cpp:241:47: error: 'send' was not declared in this scope
send(_mdnsSocket, _response, _responseLen, 0);
@sravanjosh, I too facing this problem but because of some time restriction I didn’t work on that. There are some changes for Photons we need to make, like passing network interface to the socket functions. I am not sure about what all the changes we need to make. Hopefully I can work on it this weekend. Will let you know the progress.
