8 files changed, 88 insertions, 24 deletions

diff --git a/client/CMakeLists.txt b/client/CMakeLists.txt
index 9e433b1..bcef4c0 100644
--- a/client/CMakeLists.txt
+++ b/client/CMakeLists.txt
@@ -4,11 +4,17 @@ set(CMAKE_C_STANDARD 11)
 set(CMAKE_CXX_STANDARD 17)
 set(CMAKE_EXPORT_COMPILE_COMMANDS 1)
 
-include(../proto/include.cmake)
-
 project(puzzlebox_client C CXX)
 
+include(../proto/include.cmake)
+
 add_executable(main
 	main.cpp
 	)
 
+target_link_libraries(main
+	puzbus
+	mpack
+	)
+
+
diff --git a/client/lib b/client/lib
new file mode 120000
index 0000000..dc598c5
--- /dev/null
+++ b/client/lib
@@ -0,0 +1 @@
+../lib
\ No newline at end of file
diff --git a/client/main.cpp b/client/main.cpp
index 7a05049..30d7045 100644
--- a/client/main.cpp
+++ b/client/main.cpp
@@ -1,25 +1,54 @@
 #include <cstdio>
-#include <string>
-
-#include "puzbusv1.pb.h"
-
-int main() {
-	GOOGLE_PROTOBUF_VERIFY_VERSION;
-
-	puzbus::I2CMsg test_msg;
+#include <cstdlib>
+#include <cstring>
+#include <unistd.h>
+
+#include "puzbusv1.h"
+
+int send_message() {
+	const char* data = "Test message data!";
+	struct pb_msg output = {
+		.addr = 0x39,
+		.data = (char*) data,
+		.length = strlen(data),
+	};
+
+	char* packed;
+	size_t size;
+	if (!pb_write(&output, &packed, &size)) {
+		printf("error writing!\n");
+		return 1;
+	}
 
-	test_msg.set_address(0x39);
-	test_msg.set_data("Test message data!");
+	fwrite(packed, sizeof(packed[0]), size, stdout);
+	fflush(stdout);
 
-	std::string output;
-	test_msg.SerializeToString(&output);
+	return 0;
+}
 
-	printf("output[%lu]:\n", output.size());
-	for (size_t i = 0; i < output.size(); i++) {
-		printf("%02x ", output[i]);
+int read_message() {
+	freopen(NULL, "rb", stdin); // allow binary on stdin
+	struct pb_msg input;
+	
+	char buf[8]; // extremely small buffer to test chunked message parsing
+	size_t bytes = 0;
+	while ((bytes = fread(buf, sizeof(buf[0]), sizeof(buf), stdin)) > 0) {
+		if (!pb_read(&input, buf, bytes)) continue;
+
+		printf("address: 0x%02x\n", input.addr);
+		printf("data:    \"%.*s\"\n", input.length, input.data);
+		free(input.data);
+		return 0;
 	}
-	printf("\n");
 
+	return 1;
+}
+
+int main() {
+	if (!isatty(fileno(stdout))) return send_message();
+	if (!isatty(fileno(stdin))) return read_message();
+	
+	printf("please pipe some data in or out to use this program\n");
 	return 0;
 }
 
diff --git a/main/sock.c b/main/sock.c
index 7064de7..dac62af 100644
--- a/main/sock.c
+++ b/main/sock.c
@@ -5,9 +5,10 @@
 #include <lwip/api.h>
 
 #include "init.h"
-
 #include "config.h"
 
+struct netconn* current_connection = NULL;
+
 void recv_handler(struct netconn* conn, struct netbuf* buf) {
 	void *data;
 	uint16_t len;
@@ -21,17 +22,16 @@ void recv_handler(struct netconn* conn, struct netbuf* buf) {
 }
 
 void accept_handler(struct netconn* conn) {
-	printf("new connection!\n");
+	current_connection = conn;
 
 	struct netbuf* buf;
-
 	while (netconn_recv(conn, &buf) == ERR_OK)
 		recv_handler(conn, buf);
 
 	netconn_close(conn);
 	netconn_delete(conn);
 
-	printf("connection closed!\n");
+	current_connection = NULL;
 }
 
 void serve_task() {
diff --git a/main/sock.h b/main/sock.h
index dd7fc61..2a73418 100644
--- a/main/sock.h
+++ b/main/sock.h
@@ -1,5 +1,11 @@
 #pragma once
 
+#include <stdint.h>
+#include <stddef.h>
+
 /** \brief start listening for TCP socket requests */
 void serve_task();
 
+void i2c_send(uint16_t addr, char* data, size_t data_size);
+void i2c_recv(uint16_t addr, char* data, size_t data_size);
+
diff --git a/proto/include.cmake b/proto/include.cmake
index c8a90b6..ac1305e 100644
--- a/proto/include.cmake
+++ b/proto/include.cmake
@@ -1,4 +1,7 @@
 include_directories(${CMAKE_CURRENT_LIST_DIR})
+add_library(puzbus STATIC
+	${CMAKE_CURRENT_LIST_DIR}/puzbusv1.c
+	)
 
 # mpack
 include_directories(${CMAKE_CURRENT_LIST_DIR}/lib/mpack/src/mpack)
diff --git a/proto/puzbusv1.c b/proto/puzbusv1.c
index 9d1335e..3ff7c63 100644
--- a/proto/puzbusv1.c
+++ b/proto/puzbusv1.c
@@ -1,13 +1,32 @@
 #include <mpack.h>
+#include <stdio.h>
 
 #include "puzbusv1.h"
 
 int pb_read(struct pb_msg* target, char* buf, size_t buf_sz) {
 	mpack_reader_t reader;
+	printf("read %lu bytes...\n", buf_sz);
+
+	mpack_reader_init_data(&reader, buf, buf_sz);
+
+	uint16_t address = mpack_expect_u16(&reader);
+	char data_buf[80];
+	size_t data_size = mpack_expect_bin_buf(&reader, data_buf, sizeof(data_buf));
+
+	printf("0x%02x\n", address);
+	printf("\"%.*s\"\n", data_size, data_buf);
 
 	return 0;
 }
 
-void pb_free(struct pb_msg* msg);
+int pb_write(struct pb_msg* target, char** buf, size_t* buf_sz) {
+	mpack_writer_t writer;
+	mpack_writer_init_growable(&writer, buf, buf_sz);
 
+	mpack_write_u16(&writer, target->addr);
+	mpack_write_bin(&writer, target->data, target->length);
+
+	// finish writing
+	return mpack_writer_destroy(&writer) == mpack_ok;
+}
 
diff --git a/proto/puzbusv1.h b/proto/puzbusv1.h
index 071c887..116dbf9 100644
--- a/proto/puzbusv1.h
+++ b/proto/puzbusv1.h
@@ -14,7 +14,7 @@ struct pb_msg {
 };
 
 int pb_read(struct pb_msg* target, char* buf, size_t buf_sz);
-void pb_free(struct pb_msg* msg);
+int pb_write(struct pb_msg* target, char** buf, size_t* buf_sz);
 
 #ifdef __cplusplus
 }