From 734af9453ca53aaf22565876003388357f4e3871 Mon Sep 17 00:00:00 2001
From: Geoffrey Merck <F4FXL@users.noreply.github.com>
Date: Sat, 16 May 2020 17:16:05 +0200
Subject: [PATCH 1/3] Fix message for FM EOT

---
 FMNetwork.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/FMNetwork.cpp b/FMNetwork.cpp
index 4e3df87..57095c5 100644
--- a/FMNetwork.cpp
+++ b/FMNetwork.cpp
@@ -84,7 +84,7 @@ bool CFMNetwork::writeEOT()
 	buffer[2U] = 'E';
 
 	if (m_debug)
-		CUtils::dump(1U, "FM Network Data Sent", buffer, 3U);
+		CUtils::dump(1U, "FM Network End of Transmission Sent", buffer, 3U);
 
 	return m_socket.write(buffer, 3U, m_address, m_port);
 }

From 23e92af6faa7430dc8afe8e60153c9c9d26c5d00 Mon Sep 17 00:00:00 2001
From: Geoffrey Merck <F4FXL@users.noreply.github.com>
Date: Sat, 16 May 2020 17:40:42 +0200
Subject: [PATCH 2/3] Add Poll message

---
 FMNetwork.cpp | 25 ++++++++++++++++++++++++-
 FMNetwork.h   |  3 +++
 2 files changed, 27 insertions(+), 1 deletion(-)

diff --git a/FMNetwork.cpp b/FMNetwork.cpp
index 57095c5..10078b5 100644
--- a/FMNetwork.cpp
+++ b/FMNetwork.cpp
@@ -33,7 +33,8 @@ m_address(),
 m_port(gatewayPort),
 m_debug(debug),
 m_enabled(false),
-m_buffer(2000U, "FM Network")
+m_buffer(2000U, "FM Network"),
+m_pollTimer(1000U, 5U)
 {
 	assert(gatewayPort > 0U);
 	assert(!gatewayAddress.empty());
@@ -52,6 +53,8 @@ bool CFMNetwork::open()
 	if (m_address.s_addr == INADDR_NONE)
 		return false;
 
+	m_pollTimer.start();
+
 	return m_socket.open();
 }
 
@@ -91,6 +94,12 @@ bool CFMNetwork::writeEOT()
 
 void CFMNetwork::clock(unsigned int ms)
 {
+	m_pollTimer.clock(ms);
+	if (m_pollTimer.hasExpired()) {
+		writePoll();
+		m_pollTimer.start();
+	}
+
 	unsigned char buffer[BUFFER_LENGTH];
 
 	in_addr address;
@@ -159,3 +168,17 @@ void CFMNetwork::enable(bool enabled)
 
 	m_enabled = enabled;
 }
+
+bool CFMNetwork::writePoll()
+{
+	unsigned char buffer[3U];
+
+	buffer[0U] = 'F';
+	buffer[1U] = 'M';
+	buffer[2U] = 'P';
+
+	if (m_debug)
+		CUtils::dump(1U, "FM Network Poll Sent", buffer, 3U);
+
+	return m_socket.write(buffer, 3U, m_address, m_port);
+}
diff --git a/FMNetwork.h b/FMNetwork.h
index fba36d2..453e776 100644
--- a/FMNetwork.h
+++ b/FMNetwork.h
@@ -54,6 +54,9 @@ private:
 	bool           m_debug;
 	bool           m_enabled;
 	CRingBuffer<unsigned char> m_buffer;
+	CTimer         m_pollTimer;
+
+	bool writePoll();
 };
 
 #endif

From 578ef5a3d41021cacf937c5366077a9cf15ee872 Mon Sep 17 00:00:00 2001
From: Geoffrey Merck <F4FXL@users.noreply.github.com>
Date: Sat, 16 May 2020 17:45:24 +0200
Subject: [PATCH 3/3] Handle poll message

---
 FMNetwork.cpp | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/FMNetwork.cpp b/FMNetwork.cpp
index 10078b5..67d0f2e 100644
--- a/FMNetwork.cpp
+++ b/FMNetwork.cpp
@@ -114,6 +114,10 @@ void CFMNetwork::clock(unsigned int ms)
 		return;
 	}
 
+	// Ignore incoming polls
+	if (::memcmp(buffer, "FMP", 3U) == 0)
+		return;
+
 	// Invalid packet type?
 	if (::memcmp(buffer, "FMD", 3U) != 0)
 		return;