begin new ble charateristics

src/mesh-pb-constants.cpp

@@ -0,0 +1,38 @@
+#include <Arduino.h>
+#include "mesh-pb-constants.h"
+#include <pb_encode.h>
+#include <pb_decode.h>
+#include <assert.h>
+
+/// helper function for encoding a record as a protobuf, any failures to encode are fatal and we will panic
+/// returns the encoded packet size
+size_t pb_encode_to_bytes(uint8_t *destbuf, size_t destbufsize, const pb_msgdesc_t *fields, const void *src_struct)
+{
+
+    pb_ostream_t stream = pb_ostream_from_buffer(destbuf, destbufsize);
+    if (!pb_encode(&stream, fields, &src_struct))
+    {
+        Serial.printf("Error: can't encode protobuf %s\n", PB_GET_ERROR(&stream));
+        assert(0); // FIXME - panic
+    }
+    else
+    {
+        return stream.bytes_written;
+    }
+}
+
+
+/// helper function for decoding a record as a protobuf, we will return false if the decoding failed
+bool pb_decode_from_bytes(const uint8_t *srcbuf, size_t srcbufsize, const pb_msgdesc_t *fields, void *dest_struct)
+{
+    pb_istream_t stream = pb_istream_from_buffer(srcbuf, srcbufsize);
+    if (!pb_decode(&stream, fields, &dest_struct))
+    {
+        Serial.printf("Error: can't decode protobuf %s\n", PB_GET_ERROR(&stream));
+        return false;
+    }
+    else
+    {
+        return true;
+    }
+}