fix: address backfill issue on tcp connections; add logging (#3676)

Signed-off-by: James Rich <2199651+jamesarich@users.noreply.github.com>
Co-authored-by: James Rich <2199651+jamesarich@users.noreply.github.com>

app/src/test/java/com/geeksville/mesh/service/StoreForwardHistoryRequestTest.kt

@@ -0,0 +1,67 @@
+/*
+ * Copyright (c) 2025 Meshtastic LLC
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+package com.geeksville.mesh.service
+
+import org.junit.Assert.assertEquals
+import org.junit.Test
+import org.meshtastic.proto.StoreAndForwardProtos
+
+class StoreForwardHistoryRequestTest {
+
+    @Test
+    fun `buildStoreForwardHistoryRequest copies positive parameters`() {
+        val request =
+            MeshService.buildStoreForwardHistoryRequest(
+                lastRequest = 42,
+                historyReturnWindow = 15,
+                historyReturnMax = 25,
+            )
+
+        assertEquals(StoreAndForwardProtos.StoreAndForward.RequestResponse.CLIENT_HISTORY, request.rr)
+        assertEquals(42, request.history.lastRequest)
+        assertEquals(15, request.history.window)
+        assertEquals(25, request.history.historyMessages)
+    }
+
+    @Test
+    fun `buildStoreForwardHistoryRequest omits non-positive parameters`() {
+        val request =
+            MeshService.buildStoreForwardHistoryRequest(lastRequest = 0, historyReturnWindow = -1, historyReturnMax = 0)
+
+        assertEquals(StoreAndForwardProtos.StoreAndForward.RequestResponse.CLIENT_HISTORY, request.rr)
+        assertEquals(0, request.history.lastRequest)
+        assertEquals(0, request.history.window)
+        assertEquals(0, request.history.historyMessages)
+    }
+
+    @Test
+    fun `resolveHistoryRequestParameters uses config values when positive`() {
+        val (window, max) = MeshService.resolveHistoryRequestParameters(window = 30, max = 10)
+
+        assertEquals(30, window)
+        assertEquals(10, max)
+    }
+
+    @Test
+    fun `resolveHistoryRequestParameters falls back to defaults when non-positive`() {
+        val (window, max) = MeshService.resolveHistoryRequestParameters(window = 0, max = -5)
+
+        assertEquals(1440, window)
+        assertEquals(100, max)
+    }
+}