Initial commit

gateway_protocol/gateway_protocol.c

+#include <gateway_protocol.h>
+
+
+void gateway_protocol_packet_encode (
+    const uint8_t dev_id, 
+    const gateway_protocol_packet_type_t packet_type,
+    const uint8_t payload_length,
+    const uint8_t *payload,
+    uint8_t *packet_length,
+    uint8_t *packet)
+{
+    *packet_length = 0;
+
+    packet[*packet_length] = dev_id;
+    packet_length++;
+
+    packet[*packet_length] = packet_type;
+    (*packet_length)++;
+
+    memcpy(&packet[*packet_length], payload, payload_length);
+    *packet_length += payload_length;
+}
+
+uint8_t gateway_protocol_packet_decode (
+    uint8_t *dev_id, 
+    gateway_protocol_packet_type_t *packet_type,
+    uint8_t *payload_length,
+    uint8_t *payload,
+    const uint8_t packet_length,
+    const uint8_t *packet)
+{
+    uint8_t p_len = 0;
+
+    *dev_id = packet[p_len];
+    p_len++;
+
+    *packet_type = (gateway_protocol_packet_type_t) packet[p_len];
+    p_len++;
+
+    *payload_length = packet_length - p_len;
+
+    memcpy(payload, &packet[p_len], *payload_length);
+    p_len += *payload_length;
+
+    return (p_len == packet_length);
+}
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gateway_protocol/gateway_protocol.h

+#ifndef __GATEWAY_PROTOCOL_H__
+#define __GATEWAY_PROTOCOL_H__
+
+#include <stdint.h>
+#include <string.h>
+
+#define GATEWAY_PROTOCOL_PACKET_SIZE_MAX    128
+
+typedef enum {
+    GATEWAY_PROTOCOL_PACKET_TYPE_DATA_SEND = 0x00,
+    GATEWAY_PROTOCOL_PACKET_TYPE_PEND_REQ = 0x04,
+    GATEWAY_PROTOCOL_PACKET_TYPE_PEND_SEND = 0x05,
+    GATEWAY_PROTOCOL_PACKET_TYPE_STAT = 0x10,
+    GATEWAY_PROTOCOL_PACKET_TYPE_TIME_REQ = 0x20,
+    GATEWAY_PROTOCOL_PACKET_TYPE_TIME_SEND = 0x21
+} gateway_protocol_packet_type_t;
+
+typedef enum {
+    GATEWAY_PROTOCOL_STAT_ACK = 0,
+    GATEWAY_PROTOCOL_STAT_ACK_PEND,
+    GATEWAY_PROTOCOL_STAT_NACK = 0xFF
+} gateway_protocol_stat_t;
+
+void gateway_protocol_packet_encode (
+    const uint8_t dev_id, 
+    const gateway_protocol_packet_type_t packet_type,
+    const uint8_t payload_length,
+    const uint8_t *payload,
+    uint8_t *packet_length,
+    uint8_t *packet);
+
+uint8_t gateway_protocol_packet_decode (
+    uint8_t *dev_id, 
+    gateway_protocol_packet_type_t *packet_type,
+    uint8_t *payload_length,
+    uint8_t *payload,
+    const uint8_t packet_length,
+    const uint8_t *packet);
+
+#endif // __GATEWAY_PROTOCOL_H__
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