52 lines
2.4 KiB
C++
52 lines
2.4 KiB
C++
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#pragma once
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// Dispatches station-link messages (phone -> micrOBU) to the station and sends the
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// micrOBU -> phone messages (results, indications, identifier-change events, status).
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#include "link_protocol.hpp"
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#include "station.hpp"
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namespace microbu {
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/// @brief Represents the transport mechanism for link messages. Either BLE or Serial
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enum class LinkTransport : std::uint8_t { serial, ble };
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class LinkService {
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public:
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/// @brief Binds the service to a station and subscribes to its indication/id-event callbacks.
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/// @param station Station to bind to; must outlive the LinkService.
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explicit LinkService(Station& station);
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/// @brief Decodes and dispatches one received message; call from the station task.
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/// @param message Raw message bytes as received from the transport.
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/// @param origin Transport the message arrived on; replies go back on the same transport.
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void handle(const link::Bytes& message, LinkTransport origin);
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/// @brief Periodic work: broadcasts STATUS once a second.
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void tick();
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private:
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/// @brief Encodes and writes one message on the given transport.
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/// @param transport Transport to write to.
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/// @param opcode Message opcode.
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/// @param sequence Sequence number to stamp on the header.
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/// @param body Encoded message body.
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void send(LinkTransport transport, link::Opcode opcode, std::uint16_t sequence, const link::Bytes& body);
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/// @brief Sends a message on serial, and also on BLE when a phone is connected.
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/// @param opcode Message opcode.
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/// @param sequence Sequence number to stamp on the header.
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/// @param body Encoded message body.
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void broadcast(link::Opcode opcode, std::uint16_t sequence, const link::Bytes& body);
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/// @brief Sends a RESULT reply to the message's origin transport.
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/// @param origin Transport to reply on.
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/// @param sequence Sequence number of the message being replied to.
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/// @param code Result code to report.
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/// @param detail Optional result detail bytes.
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void reply(LinkTransport origin, std::uint16_t sequence, link::Code code, const link::Bytes& detail = {});
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/// @brief Builds a STATUS snapshot from the station and transport counters.
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/// @return Current status.
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link::Status status();
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Station& station_;
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std::uint16_t own_sequence_ = 0;
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link::Bytes bundle_; // credentials being provisioned
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std::uint16_t bundle_total_ = 0;
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std::int64_t last_status_us_ = 0;
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};
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} // namespace microbu
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