The interchange protocol over UDP

Description of message formats for a remote access to the EV3 brick.

Also see "source/ev3/ev3_link/README".

Write data into the specified file on the EV3 brick

Host application command

Bytes	Content
0 .. 1	EV3_WRITE_FILE
2 .. 3	Message counter (id)
4 .. 5	Filename size (f_sz)
6 .. 7	Data size (d_sz)
8 .. 8 + f_sz - 1	Filename
8 + f_sz .. 8 + f_sz + d_sz - 1	Data

Brick server reply

Bytes	Content
0 .. 1	EV3_RESULT_WRITE
2 .. 3	id
4 .. 5	0
6 .. 7	Count of written bytes

---

Write data into several specified files on the EV3 brick

Host application command

Bytes	Content
0 .. 1	EV3_WRITE_FILE
2 .. 3	Message counter (id)
4 .. 5	Filename size (f_sz)
6 .. 7	Data size (d_sz)
8	Sequence number 1
9	SN 2
10	SN 3
11	SN 4
12 .. 13	Position of SN in template
14 .. 14 + f_sz - 1	Filename (template)
14 + f_sz .. 14 + f_sz + d_sz - 1	Data

Brick server reply

Bytes	Content
0 .. 1	EV3_RESULT_WRITE
2 .. 3	id
4 .. 5	0
6 .. 7	Count of written bytes

---

Read data from the specified file on the EV3 brick

Host application command

Bytes	Content
0 .. 1	EV3_READ_FILE
2 .. 3	Message counter (id)
4 .. 5	Filename size (f_sz)
6 .. 7	Max data size
8 .. 8 + f_sz - 1	Filename

Brick server reply

Bytes	Content
0 .. 1	EV3_DATA_READ
2 .. 3	id
4 .. 5	0
6 .. 7	Count of read bytes (d_sz)
8 .. 8 + d_sz - 1	Data

---

List files in the specified directory on the EV3 brick

Host application command

Bytes	Content
0 .. 1	EV3_LIST_DIR
2 .. 3	Message counter (id)
4 .. 5	Directory name size (f_sz)
6 .. 7	Max files list size
8 .. 8 + f_sz - 1	Directory name

Brick server reply

Bytes	Content
0 .. 1	EV3_DIRECTORY
2 .. 3	id
4 .. 5	0
6 .. 7	Files list size (d_sz)
8 .. 8 + d_sz - 1	Files list

---

Power-off the EV3 brick

Host application command

Bytes	Content
0 .. 1	EV3_POWEROFF
2 .. 3	Message counter (id)
4 .. 5	0x5555
6 .. 7	0xAAAA

Brick server reply

Bytes	Content
0 .. 1	EV3_COMPLETION
2 .. 3	id
4 .. 5	0
6 .. 7	0

---

Notify a host that the brick server is online

Brick server beacon

Bytes	Content
0 .. 1	EV3_WELCOME
2 .. 3	0
4 .. 5	0
6 .. 7	0