A port and bug fix of Alix955/code/ntp-client. The socket would hang as it was defined both with a timeout and as blocking.
Diff: NTPClient.cpp
- Revision:
- 2:a3aec199dc7c
- Parent:
- 1:099750f42b02
--- a/NTPClient.cpp Fri Dec 07 13:07:56 2018 +0000 +++ b/NTPClient.cpp Sun May 26 08:46:35 2019 +0100 @@ -1,58 +1,70 @@ #include "ntp-client/NTPClient.h" #include "mbed.h" -NTPClient::NTPClient(NetworkInterface *iface) -: iface(iface), nist_server_address((char *)NTP_DEFULT_NIST_SERVER_ADDRESS), nist_server_port(NTP_DEFULT_NIST_SERVER_PORT) { +NTPClient::NTPClient(NetworkInterface *iface) : iface(iface), + nist_server_address((char *)NTP_DEFULT_NIST_SERVER_ADDRESS), + nist_server_port(NTP_DEFULT_NIST_SERVER_PORT) { } -void NTPClient::set_server(char* server, int port){ +void NTPClient::set_server(char* server, int port) { nist_server_address = server; - nist_server_port = port; + nist_server_port = port; } +/* The timeout value is in uS. A sensible positive value is >5K to + avoid the timeout firing on slow responses. Note that this is UDP + so there is the likely possibility that the packet will be lost. + + A timeout value of 0 corresponds to set_blocking(false). + A timeout value of -1 corresponds to set_blocking(true). +*/ time_t NTPClient::get_timestamp(int timeout) { - const time_t TIME1970 = (time_t)2208988800UL; - int ntp_send_values[12] = {0}; - int ntp_recv_values[12] = {0}; - - SocketAddress nist; - int ret_gethostbyname = iface->gethostbyname(nist_server_address, &nist); + const time_t TIME1970 = (time_t)2208988800UL; + int ntp_send_values[12] = {0}; + int ntp_recv_values[12] = {0}; - if (ret_gethostbyname < 0) { - // Network error on DNS lookup - printf("Error on DNS lookup : %d\n" , ret_gethostbyname); - return ret_gethostbyname; - } - - nist.set_port(nist_server_port); + SocketAddress nist; + UDPSocket sock; + SocketAddress source; + + nsapi_size_or_error_t szerr; - memset(ntp_send_values, 0x00, sizeof(ntp_send_values)); - ntp_send_values[0] = '\x1b'; + int ret_gethostbyname = iface->gethostbyname(nist_server_address, &nist); + if (ret_gethostbyname < 0) { + // Network error on DNS lookup + printf("Error on DNS lookup : %d\n" , ret_gethostbyname); + return ret_gethostbyname; + } + nist.set_port(nist_server_port); - memset(ntp_recv_values, 0x00, sizeof(ntp_recv_values)); + memset(ntp_recv_values, 0x00, sizeof(ntp_recv_values)); + memset(ntp_send_values, 0x00, sizeof(ntp_send_values)); + ntp_send_values[0] = '\x1b'; - UDPSocket sock; - sock.open(iface); - sock.set_timeout(timeout); + sock.open(iface); + sock.set_timeout(timeout); + + szerr = sock.sendto(nist, (void*)ntp_send_values, sizeof(ntp_send_values)); + if(szerr < 0) { + sock.close(); + printf("sock.sendto() error code = %d\n\r", szerr); + return szerr; + } - sock.sendto(nist, (void*)ntp_send_values, sizeof(ntp_send_values)); + szerr = sock.recvfrom(&source, (void*)ntp_recv_values, sizeof(ntp_recv_values)); + if(szerr < 0) { + sock.close(); + printf("sock.sendto() error code = %d\n\r", szerr); + return szerr; + } - SocketAddress source; - const int n = sock.recvfrom(&source, (void*)ntp_recv_values, sizeof(ntp_recv_values)); - - if (n > 10) { + if (szerr > 10) { return ntohl(ntp_recv_values[10]) - TIME1970; } else { - if (n < 0) { - // Network error - printf("Network error: %d\n", n); - return n; - } else { - // No or partial data returned - printf("No or partial data returned: -1"); - return -1; - } - } + // No or partial data returned + printf("No or partial data returned: bytes=%d\n\r", szerr); + return -1; + } } uint32_t NTPClient::ntohl(uint32_t x) { @@ -61,4 +73,4 @@ ret |= (x & 0xff0000UL) >> 8; ret |= (x & 0xff000000UL) >> 24; return ret; -} \ No newline at end of file +}