+SR_PRIV int metex_me31_receive_data(int fd, int revents, void *cb_data);
+SR_PRIV int peaktech_3410_receive_data(int fd, int revents, void *cb_data);
+SR_PRIV int mastech_mas345_receive_data(int fd, int revents, void *cb_data);
+SR_PRIV int va_va18b_receive_data(int fd, int revents, void *cb_data);
+SR_PRIV int metex_m3640d_receive_data(int fd, int revents, void *cb_data);
+SR_PRIV int peaktech_4370_receive_data(int fd, int revents, void *cb_data);
+SR_PRIV int pce_pce_dm32_receive_data(int fd, int revents, void *cb_data);
+SR_PRIV int radioshack_22_168_receive_data(int fd, int revents, void *cb_data);
+SR_PRIV int radioshack_22_812_receive_data(int fd, int revents, void *cb_data);
+