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);

lib/dd3_transport_logic/include/lora_frame_logic.h

@@ -0,0 +1,19 @@
+#pragma once
+
+#include <Arduino.h>
+
+enum class LoraFrameDecodeStatus : uint8_t {
+  Ok = 0,
+  LengthMismatch = 1,
+  CrcFail = 2,
+  InvalidMsgKind = 3
+};
+
+uint16_t lora_crc16_ccitt(const uint8_t *data, size_t len);
+
+bool lora_build_frame(uint8_t msg_kind, uint16_t device_id_short, const uint8_t *payload, size_t payload_len,
+                      uint8_t *out_frame, size_t out_cap, size_t &out_len);
+
+LoraFrameDecodeStatus lora_parse_frame(const uint8_t *frame, size_t frame_len, uint8_t max_msg_kind, uint8_t *out_msg_kind,
+                                       uint16_t *out_device_id_short, uint8_t *out_payload, size_t payload_cap,
+                                       size_t *out_payload_len);