Added Reading of Json with Protocol Definition

proto/proto.go

@@ -0,0 +1,47 @@
+package proto
+
+import (
+	"encoding/json"
+	"strconv"
+)
+
+type HexByte byte
+
+type ProtoComplete struct {
+	Header    ProtocolHeader            `json:"protocol"`
+	Protocols map[string][]ProtoMessage `json:"protocols"`
+}
+
+type ProtocolHeader struct {
+	StartByte     HexByte `json:"start_byte"`
+	MessageLength int     `json:"message_length"`
+	MaxPayload    int     `json:"max_payload"`
+	Checksum      string  `json:"checksum"`
+}
+
+type ProtoMessage struct {
+	Name    string                `json:"name"`
+	ID      HexByte               `json:"id"`
+	Payload []ProtoMessagePayload `json:"payload,omitempty"` // optional falls kein payload
+}
+
+type ProtoMessagePayload struct {
+	Name        string `json:"name"`
+	DataType    string `json:"type"`
+	ArrayLength int    `json:"array,omitempty"` // optional falls kein array
+}
+
+func (h *HexByte) UnmarshalJSON(data []byte) error {
+	var s string
+	if err := json.Unmarshal(data, &s); err != nil { // turn into go string
+		return err
+	}
+
+	i, err := strconv.ParseUint(s, 0, 8)
+	if err != nil {
+		return err
+	}
+
+	*h = HexByte(i)
+	return nil
+}

proto/proto_test.go

@@ -0,0 +1,23 @@
+package proto
+
+import (
+	"encoding/json"
+	"log"
+	"os"
+	"testing"
+)
+
+func TestReadJson(t *testing.T) {
+	con, err := os.ReadFile("../testdata/prot1.json")
+	if err != nil {
+		log.Fatalf("Could not read file %v", err)
+	}
+
+	pc := &ProtoComplete{}
+
+	json.Unmarshal(con, pc)
+
+	log.Printf("%v", pc)
+
+	t.Fail()
+}

testdata/prot1.json

@@ -5,29 +5,49 @@
     "max_payload": 255,
     "checksum": "xor"
   },
+  "protocols": {
     "messages_esp_to_pc": [
       {
         "name": "Clients",
         "id": "0xE1",
         "payload": [
-        { "name": "clientCount", "type": "uint8_t" },
+          {
-        { "name": "clientAvaiableBitMask", "type": "uint32_t" }
+            "name": "clientCount",
+            "type": "uint8_t"
+          },
+          {
+            "name": "clientAvaiableBitMask",
+            "type": "uint32_t"
+          }
         ]
       },
       {
         "name": "Status",
         "id": "0xE2",
         "payload": [
-        { "name": "clientId", "type": "uint8_t" },
+          {
-        { "name": "mac", "type": "uint8_t", "array": 6 }
+            "name": "clientId",
+            "type": "uint8_t"
+          },
+          {
+            "name": "mac",
+            "type": "uint8_t",
+            "array": 6
+          }
         ]
       },
       {
         "name": "Pong",
         "id": "0xD1",
         "payload": [
-        { "name": "clientId", "type": "uint8_t" },
+          {
-        { "name": "ping", "type": "uint32_t" }
+            "name": "clientId",
+            "type": "uint8_t"
+          },
+          {
+            "name": "ping",
+            "type": "uint32_t"
+          }
         ]
       }
     ],
@@ -36,14 +56,20 @@
         "name": "RequestPing",
         "id": "0xE1",
         "payload": [
-        { "name": "clientId", "type": "uint8_t" }
+          {
+            "name": "clientId",
+            "type": "uint8_t"
+          }
         ]
       },
       {
         "name": "RequestStatus",
         "id": "0xE2",
         "payload": [
-        { "name": "clientId", "type": "uint8_t" }
+          {
+            "name": "clientId",
+            "type": "uint8_t"
+          }
         ]
       },
       {
@@ -54,9 +80,13 @@
         "name": "FirmwareUpdateLine",
         "id": "0xF2",
         "payload": [
-        { "name": "data", "type": "uint8_t", "array": 240 }
+          {
+            "name": "data",
+            "type": "uint8_t",
+            "array": 240
+          }
         ]
       }
     ]
+  }
 }
-