7 files changed, 23 insertions, 11 deletions
diff --git a/lib/pure/asyncdispatch.nim b/lib/pure/asyncdispatch.nim
index 214b7d12c..64100afa7 100644
--- a/lib/pure/asyncdispatch.nim
+++ b/lib/pure/asyncdispatch.nim
@@ -2024,7 +2024,7 @@ when defined(posix):
   import posix
 
 when defined(linux) or defined(windows) or defined(macosx) or defined(bsd) or
-       defined(solaris) or defined(zephyr) or defined(freertos):
+       defined(solaris) or defined(zephyr) or defined(freertos) or defined(nuttx):
   proc maxDescriptors*(): int {.raises: OSError.} =
     ## Returns the maximum number of active file descriptors for the current
     ## process. This involves a system call. For now `maxDescriptors` is
@@ -2033,6 +2033,9 @@ when defined(linux) or defined(windows) or defined(macosx) or defined(bsd) or
       result = 16_700_000
     elif defined(zephyr) or defined(freertos):
       result = FD_MAX
+    elif defined(nuttx):
+      # The maximum number of concurrently active UDP and TCP ports.
+      result = NACTIVESOCKETS
     else:
       var fdLim: RLimit
       if getrlimit(RLIMIT_NOFILE, fdLim) < 0:
diff --git a/lib/pure/asynchttpserver.nim b/lib/pure/asynchttpserver.nim
index 845875a1e..c09fe35ca 100644
--- a/lib/pure/asynchttpserver.nim
+++ b/lib/pure/asynchttpserver.nim
@@ -387,8 +387,9 @@ proc listen*(server: AsyncHttpServer; port: Port; address = ""; domain = AF_INET
   server.socket = newAsyncSocket(domain)
   if server.reuseAddr:
     server.socket.setSockOpt(OptReuseAddr, true)
-  if server.reusePort:
-    server.socket.setSockOpt(OptReusePort, true)
+  when not defined(nuttx):
+    if server.reusePort:
+      server.socket.setSockOpt(OptReusePort, true)
   server.socket.bindAddr(port, address)
   server.socket.listen()
 
diff --git a/lib/pure/asyncnet.nim b/lib/pure/asyncnet.nim
index 982459af7..d35dbdfaf 100644
--- a/lib/pure/asyncnet.nim
+++ b/lib/pure/asyncnet.nim
@@ -106,7 +106,8 @@ export SOBool
 # TODO: Remove duplication introduced by PR #4683.
 
 const defineSsl = defined(ssl) or defined(nimdoc)
-const useNimNetLite = defined(nimNetLite) or defined(freertos) or defined(zephyr)
+const useNimNetLite = defined(nimNetLite) or defined(freertos) or defined(zephyr) or
+    defined(nuttx)
 
 when defineSsl:
   import openssl
diff --git a/lib/pure/ioselects/ioselectors_select.nim b/lib/pure/ioselects/ioselectors_select.nim
index 34c88d85e..a6f54e791 100644
--- a/lib/pure/ioselects/ioselectors_select.nim
+++ b/lib/pure/ioselects/ioselectors_select.nim
@@ -313,7 +313,7 @@ proc selectInto*[T](s: Selector[T], timeout: int,
   verifySelectParams(timeout)
 
   if timeout != -1:
-    when defined(genode) or defined(freertos) or defined(zephyr):
+    when defined(genode) or defined(freertos) or defined(zephyr) or defined(nuttx):
       tv.tv_sec = Time(timeout div 1_000)
     else:
       tv.tv_sec = timeout.int32 div 1_000
diff --git a/lib/pure/nativesockets.nim b/lib/pure/nativesockets.nim
index 14a318412..b3465ef14 100644
--- a/lib/pure/nativesockets.nim
+++ b/lib/pure/nativesockets.nim
@@ -23,7 +23,8 @@ when hostOS == "solaris":
   {.passl: "-lsocket -lnsl".}
 
 const useWinVersion = defined(windows) or defined(nimdoc)
-const useNimNetLite = defined(nimNetLite) or defined(freertos) or defined(zephyr)
+const useNimNetLite = defined(nimNetLite) or defined(freertos) or defined(zephyr) or
+    defined(nuttx)
 
 when useWinVersion:
   import winlean
@@ -304,7 +305,7 @@ proc getAddrInfo*(address: string, port: Port, domain: Domain = AF_INET,
   let socketPort = if sockType == SOCK_RAW: "" else: $port
   var gaiResult = getaddrinfo(address, socketPort.cstring, addr(hints), result)
   if gaiResult != 0'i32:
-    when useWinVersion or defined(freertos):
+    when useWinVersion or defined(freertos) or defined(nuttx):
       raiseOSError(osLastError())
     else:
       raiseOSError(osLastError(), $gai_strerror(gaiResult))
@@ -351,7 +352,7 @@ proc getSockDomain*(socket: SocketHandle): Domain =
   else:
     raise newException(IOError, "Unknown socket family in getSockDomain")
 
-when not useNimNetLite: 
+when not useNimNetLite:
   proc getServByName*(name, proto: string): Servent {.tags: [ReadIOEffect].} =
     ## Searches the database from the beginning and finds the first entry for
     ## which the service name specified by `name` matches the s_name member
diff --git a/lib/pure/net.nim b/lib/pure/net.nim
index 1dfef3b30..d3a767eed 100644
--- a/lib/pure/net.nim
+++ b/lib/pure/net.nim
@@ -100,7 +100,8 @@ export nativesockets.Port, nativesockets.`$`, nativesockets.`==`
 export Domain, SockType, Protocol
 
 const useWinVersion = defined(windows) or defined(nimdoc)
-const useNimNetLite = defined(nimNetLite) or defined(freertos) or defined(zephyr)
+const useNimNetLite = defined(nimNetLite) or defined(freertos) or defined(zephyr) or
+    defined(nuttx)
 const defineSsl = defined(ssl) or defined(nimdoc)
 
 when useWinVersion:
diff --git a/lib/pure/selectors.nim b/lib/pure/selectors.nim
index be5037fe2..ef8736cdf 100644
--- a/lib/pure/selectors.nim
+++ b/lib/pure/selectors.nim
@@ -37,7 +37,7 @@ const hasThreadSupport = compileOption("threads") and defined(threadsafe)
 
 const ioselSupportedPlatform* = defined(macosx) or defined(freebsd) or
                                 defined(netbsd) or defined(openbsd) or
-                                defined(dragonfly) or
+                                defined(dragonfly) or defined(nuttx) or
                                 (defined(linux) and not defined(android) and not defined(emscripten))
   ## This constant is used to determine whether the destination platform is
   ## fully supported by `ioselectors` module.
@@ -328,7 +328,7 @@ else:
     doAssert(timeout >= -1, "Cannot select with a negative value, got: " & $timeout)
 
   when defined(linux) or defined(windows) or defined(macosx) or defined(bsd) or
-       defined(solaris) or defined(zephyr) or defined(freertos):
+       defined(solaris) or defined(zephyr) or defined(freertos) or defined(nuttx):
     template maxDescriptors*(): int =
       ## Returns the maximum number of active file descriptors for the current
       ## process. This involves a system call. For now `maxDescriptors` is
@@ -337,6 +337,9 @@ else:
         16_700_000
       elif defined(zephyr) or defined(freertos):
         FD_MAX
+      elif defined(nuttx):
+        # The maximum number of concurrently active UDP and TCP ports.
+        NACTIVESOCKETS
       else:
         var fdLim: RLimit
         var res = int(getrlimit(RLIMIT_NOFILE, fdLim))
@@ -360,5 +363,7 @@ else:
     include ioselects/ioselectors_select
   elif defined(zephyr):
     include ioselects/ioselectors_poll
+  elif defined(nuttx):
+    include ioselects/ioselectors_epoll
   else:
     include ioselects/ioselectors_poll