diff --git a/tests/expectnmcu/net.tcl b/tests/expectnmcu/net.tcl
new file mode 100644
index 00000000..7dc0b1a4
--- /dev/null
+++ b/tests/expectnmcu/net.tcl
@@ -0,0 +1,55 @@
+namespace eval expectnmcu::net {
+}
+
+package require expectnmcu::core
+
+# Wait for `wifi.sta.getip()` to return something that looks like an address,
+# indicating that the device under test is probably online.
+proc ::expectnmcu::net::waitwifista { dev {timeout 10} } {
+  for {set i 0} {${i} < ${timeout}} {incr i} {
+    send -i ${dev} "=wifi.sta.getip()\n"
+    expect {
+      -i ${dev} -re "\n(\[^\n\t\]+)\t\[^\t\]+\t\[^\t\]+\[\r\n\]+> " {
+        # That looks like an address report to me
+        return ${expect_out(1,string)}
+      }
+      -i ${dev} -ex "nil\[\r\n\]+> " {
+        # must not be connected yet
+        sleep 1
+      }
+      -i ${dev} -re ${::expectnmcu::core::panicre} { return -code error "Panic!" }
+      timeout { }
+    }
+  }
+
+  return -code error "WIFI STA: no IP address"
+}
+
+proc ::expectnmcu::net::guessmyip { victimip } {
+  # Guess our IP address by using the victim's
+  spawn "ip" "route" "get" ${victimip}
+  expect {
+    -re "src (\[0-9.\]+) " {
+      close
+      return ${expect_out(1,string)}
+    }
+  }
+  close
+  return -code error "Cannot find source IP"
+}
+
+# Open a socat stream with some verbosity and wait for it to become
+# ready before returning.
+proc ::expectnmcu::net::mksocat { socat_remote } {
+  spawn -noecho "socat" "-dd" "STDIO,cfmakeraw" ${socat_remote}
+
+  set timeout 10
+  expect {
+    -i ${spawn_id} -ex "listening on" { return ${spawn_id} }
+    -i ${spawn_id} -ex "starting data transfer loop" { return ${spawn_id} }
+    timeout { return -code error "Timeout opening local socat" }
+  }
+}
+
+
+package provide expectnmcu::net 1.0
diff --git a/tests/expectnmcu/pkgIndex.tcl b/tests/expectnmcu/pkgIndex.tcl
index 64dbff69..04a5dffa 100644
--- a/tests/expectnmcu/pkgIndex.tcl
+++ b/tests/expectnmcu/pkgIndex.tcl
@@ -9,4 +9,5 @@
 # full path name of this file's directory.
 
 package ifneeded expectnmcu::core 1.0 [list source [file join $dir core.tcl]]
+package ifneeded expectnmcu::net  1.0 [list source [file join $dir  net.tcl]]
 package ifneeded expectnmcu::xfer 1.0 [list source [file join $dir xfer.tcl]]