Enhance llcc68 definitions with new bandwidth and coding rate enums

- Added a new bandwidth enum value for 7.8MHz and corresponding string conversion function.
- Introduced a string conversion function for coding rates.
- Implemented a utility function to safely convert uint8_t to optional for spreading factors.
- Enhanced the modulation parameters structure with a to_string method for better representation.

inc/llcc68.hpp

@@ -962,8 +962,8 @@ read_data_internal() {
 	APP_RADIO_RETURN_ERR(irq_);
 	const auto st_ = get_status();
 	APP_RADIO_RETURN_ERR(st_);
-	const auto irq = std::move(*irq_);
-	const auto st  = std::move(*st_);
+	const auto irq = *irq_;
+	const auto st  = *st_;
 	if (irq & RADIOLIB_SX126X_IRQ_TIMEOUT || st.command_status == CommandStatus::COMMAND_TIMEOUT) {
 		return ue_t{error_t{error::RADIO_RX_TIMEOUT}};
 	}

inc/llcc68_definitions.hpp

@@ -6,6 +6,9 @@
 #define LLCC68_DEFINITIONS_H
 #include <cstddef>
 #include <cstdint>
+#include <optional>
+#include <string>
+#include <format>
 #include <tuple>
 #include <variant>
 #include "radiolib_definitions.hpp"
@@ -13,6 +16,7 @@
 namespace app::driver::llcc68 {
 using freq_t = float;
 enum LoRaBandwidth : uint8_t {
+	BW_7_8   = 0x00,
 	BW_10_4  = 0x08,
 	BW_15_6  = 0x01,
 	BW_20_8  = 0x09,
@@ -24,6 +28,33 @@ enum LoRaBandwidth : uint8_t {
 	BW_500_0 = 0x06,
 };
 
+inline const char *bw_to_string(const LoRaBandwidth &bw) {
+	switch (bw) {
+	case LoRaBandwidth::BW_7_8:
+		return "7.8MHz";
+	case LoRaBandwidth::BW_10_4:
+		return "10.4MHz";
+	case LoRaBandwidth::BW_15_6:
+		return "15.6MHz";
+	case LoRaBandwidth::BW_20_8:
+		return "20.8MHz";
+	case LoRaBandwidth::BW_31_25:
+		return "31.25MHz";
+	case LoRaBandwidth::BW_41_7:
+		return "41.7MHz";
+	case LoRaBandwidth::BW_62_5:
+		return "62.5MHz";
+	case LoRaBandwidth::BW_125_0:
+		return "125.0MHz";
+	case LoRaBandwidth::BW_250_0:
+		return "250.0MHz";
+	case LoRaBandwidth::BW_500_0:
+		return "500.0MHz";
+	default:
+		return "Unknown";
+	}
+}
+
 enum LoRaCodingRate : uint8_t {
 	CR_4_5 = 0x01,
 	CR_4_6 = 0x02,
@@ -31,6 +62,21 @@ enum LoRaCodingRate : uint8_t {
 	CR_4_8 = 0x04,
 };
 
+inline const char *cr_to_string(const LoRaCodingRate &cr) {
+	switch (cr) {
+	case LoRaCodingRate::CR_4_5:
+		return "4/5";
+	case LoRaCodingRate::CR_4_6:
+		return "4/6";
+	case LoRaCodingRate::CR_4_7:
+		return "4/7";
+	case LoRaCodingRate::CR_4_8:
+		return "4/8";
+	default:
+		return "Unknown";
+	}
+}
+
 constexpr uint16_t DEFAULT_PREAMBLE_LEN = 8;
 constexpr uint8_t DEFAULT_SYNC_WORD     = RADIOLIB_SX126X_SYNC_WORD_PRIVATE;
 constexpr uint8_t DEFAULT_CRC_TYPE      = RADIOLIB_SX126X_LORA_CRC_OFF;
@@ -43,6 +89,13 @@ constexpr auto DEFAULT_BW           = BW_250_0;
 constexpr auto DEFAULT_CR           = CR_4_5;
 constexpr auto DEFAULT_LDR_OPTIMIZE = RADIOLIB_SX126X_LORA_LOW_DATA_RATE_OPTIMIZE_OFF;
 
+inline std::optional<uint8_t> sf_from_uint8_t(const uint8_t sf) {
+	if (sf < 6 || sf > 12) {
+		return std::nullopt;
+	}
+	return sf;
+}
+
 
 struct modulation_params_t {
 	uint8_t bw;
@@ -58,6 +111,14 @@ struct modulation_params_t {
 			.ldr_optimize = DEFAULT_LDR_OPTIMIZE,
 		};
 	}
+
+	std::string to_string() const {
+		return std::format("mod_params: bw={}, sf={}, cr={}, ldr_optimize={}",
+						   bw_to_string(static_cast<LoRaBandwidth>(bw)),
+						   sf,
+						   cr_to_string(static_cast<LoRaCodingRate>(cr)),
+						   ldr_optimize ? "ON" : "OFF");
+	}
 };
 
 struct packet_params_t {