C client for GEX. bare-bones, low level access
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gex-client-c/gex/gex_client.h

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2.6 KiB

//
// Created by MightyPork on 2017/12/12.
//
#ifndef GEX_CLIENT_GEX_CLIENT_H
#define GEX_CLIENT_GEX_CLIENT_H
#include <stddef.h>
#include <stdint.h>
#include <stdbool.h>
#include "TinyFrame.h"
typedef struct gex_client_ GexClient;
/** Callback for spontaneous reports from units */
typedef void (*GEX_ReportListener)(GexClient *gex, const char *unit, uint8_t code, const uint8_t *payload, uint32_t len);
/**
* Bind a report listener
*
* @param gex - client
* @param unit_name - name of the listened for unit, NULL to bind a fallback listener
* @param lst - the listener
*/
void GEX_OnReport(GexClient *gex, const char *unit_name, GEX_ReportListener lst);
/**
* Initialize the GEX client
*
* @param device - device, e.g. /dev/ttyACM0
* @param timeout_ms - read timeout in ms (allowed only multiples of 100 ms, others are rounded)
* @return an allocated client instance
*/
GexClient *GEX_Init(const char *device, int timeout_ms);
/**
* Poll for new messages
* @param gex - client
*/
void GEX_Poll(GexClient *gex);
/**
* Safely release all resources used up by GEX_Init()
*
* @param gex - the allocated client structure
*/
void GEX_DeInit(GexClient *gex);
/**
* Query a unit
*
* @param gex - client instance
* @param unit - unit name
* @param cmd - command (hex)
* @param payload - payload for the unit
* @param len - number of bytes in the payload
* @param listener - TF listener function called for the response
*/
void GEX_Query(GexClient *gex,
const char *unit, uint8_t cmd,
uint8_t *payload, uint32_t len,
TF_Listener listener);
/**
* Query a unit and return the response. The resulting message (including payload) is
* copied to a internal holder variable. Do not attempt to free it!
*
* @attention Calling `GEX_SyncQuery` destroys the previous sync query message and payload.
*
* @param gex - client instance
* @param unit - unit name
* @param cmd - command (hex)
* @param payload - payload for the unit
* @param len - number of bytes in the payload
* @return a clone of the response, or NULL if none arrived in time.
*/
TF_Msg *GEX_SyncQuery(GexClient *gex,
const char *unit, uint8_t cmd,
uint8_t *payload, uint32_t len);
/**
* Send a command with response no listener
*
* @param gex - client instance
* @param unit - unit name
* @param cmd - command (hex)
* @param payload - payload for the unit
* @param len - number of bytes in the payload
*/
void GEX_Send(GexClient *gex,
const char *unit, uint8_t cmd,
uint8_t *payload, uint32_t len);
#endif //GEX_CLIENT_GEX_CLIENT_H