-static bool invitation_send(void *handle, uint8_t type, const char *data, size_t len) {
+static bool invitation_send(void *handle, uint8_t type, const void *data, size_t len) {
meshlink_handle_t* mesh = handle;
while(len) {
int result = send(mesh->sock, data, len, 0);
meshlink_handle_t* mesh = handle;
while(len) {
int result = send(mesh->sock, data, len, 0);
-static bool invitation_receive(void *handle, uint8_t type, const char *msg, uint16_t len) {
+static bool invitation_receive(void *handle, uint8_t type, const void *msg, uint16_t len) {