test: add lora frame and chunk reassembly logic suite

lib/dd3_transport_logic/include/batch_reassembly_logic.h

@@ -0,0 +1,28 @@
+#pragma once
+
+#include <Arduino.h>
+
+struct BatchReassemblyState {
+  bool active;
+  uint16_t batch_id;
+  uint8_t next_index;
+  uint8_t expected_chunks;
+  uint16_t total_len;
+  uint16_t received_len;
+  uint32_t last_rx_ms;
+  uint32_t timeout_ms;
+};
+
+enum class BatchReassemblyStatus : uint8_t {
+  InProgress = 0,
+  Complete = 1,
+  ErrorReset = 2
+};
+
+void batch_reassembly_reset(BatchReassemblyState &state);
+
+BatchReassemblyStatus batch_reassembly_push(BatchReassemblyState &state, uint16_t batch_id, uint8_t chunk_index,
+                                            uint8_t chunk_count, uint16_t total_len, const uint8_t *chunk_data,
+                                            size_t chunk_len, uint32_t now_ms, uint32_t timeout_ms_for_new_batch,
+                                            uint16_t max_total_len, uint8_t *buffer, size_t buffer_cap,
+                                            uint16_t &out_complete_len);