Add Class 2 fax protocol support
- class2/commands.rs: EIA/TIA-592 Class 2 AT command definitions - class2/send.rs: Class2Send implementation for simpler fax sending - CLI: Add --class option for send command (1 or 2) - CLI: Add --class2 flag for test command - Tested with Conexant V90 modem - all Class 2 commands working
This commit is contained in:
Warren
110
src/fax/class2/commands.rs
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110
src/fax/class2/commands.rs
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@@ -0,0 +1,110 @@
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/// Class 2 Fax Commands (EIA/TIA-592)
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/// Class 2 modem handles T.30 protocol internally, simpler than Class 1.
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pub struct Class2Commands;
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impl Class2Commands {
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/// Enter Class 2 fax mode
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pub const ENTER_CLASS2: &'static str = "AT+FCLASS=2";
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/// Set local station ID (max 20 chars)
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pub fn set_station_id(id: &str) -> String {
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format!("AT+FLID=\"{}\"", id)
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}
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/// Set header info (printed at top of each page)
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pub fn set_header(header: &str) -> String {
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format!("AT+FHEADER=\"{}\"", header)
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}
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/// Set fax capabilities for transmission
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/// Format: <vr>,<br>,<wd>,<ln>,<df>,<ec>,<bf>,<st>
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/// vr: vertical resolution (0=standard, 1=fine)
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/// br: bit rate (0-8 for different speeds)
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/// wd: page width (0=A4, 1=B4, 2=A3)
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/// ln: page length (0=A4, 1=B4, 2=unlimited)
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/// df: data format (0=1D MH, 1=2D MR)
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/// ec: error correction (0=none, 1=ECM)
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/// bf: binary file transfer (0=no)
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/// st: scan time (0-7)
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pub fn set_dis_params(
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resolution_fine: bool,
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speed: u8,
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ecm: bool,
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) -> String {
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let vr = if resolution_fine { 1 } else { 0 };
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let br = speed; // 0=2400, 1=4800, 2=7200, 3=9600, 4=14400
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let ec = if ecm { 1 } else { 0 };
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format!("AT+FDIS={},{}0,0,0,{},0,0", vr, br, ec)
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}
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/// Dial and initiate fax session
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pub fn dial(number: &str) -> String {
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format!("ATDT{}", number)
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}
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/// Transmit page - start sending T.4 data
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/// After CONNECT, send raw T.4 data followed by DLE ETX (0x10 0x03)
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pub const TRANSMIT_PAGE: &'static str = "AT+FDT";
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/// End page transmission
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/// <ep> = 0: more pages (MPS)
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/// <ep> = 1: end of procedure (EOP)
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/// <ep> = 2: procedure interrupt (PRI)
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pub fn end_page(more_pages: bool) -> String {
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let ep = if more_pages { 0 } else { 1 };
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format!("AT+FET={}", ep)
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}
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/// Hang up gracefully
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pub const HANGUP: &'static str = "AT+FHNG=0";
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/// Query modem capabilities
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pub const QUERY_CAPS: &'static str = "AT+FDCC=?";
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/// Query supported DCC parameters
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pub const QUERY_DCC: &'static str = "AT+FDCC";
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/// Adaptive answer - respond to incoming call
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pub const ADAPTIVE_ANSWER: &'static str = "AT+FAA=1";
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/// Receive page - start receiving T.4 data
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pub const RECEIVE_PAGE: &'static str = "AT+FDR";
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/// Query remote station capabilities after connection
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pub const QUERY_REMOTE_CAPS: &'static str = "AT+FDIS";
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}
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/// Class 2 DCC (DCE Capabilities) parameters
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#[derive(Debug, Clone)]
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pub struct DccParams {
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pub resolution: bool, // 0=standard, 1=fine
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pub speed: u8, // 0-8 for different bit rates
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pub width: u8, // 0=A4, 1=B4, 2=A3
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pub length: u8, // 0=A4, 1=unlimited
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pub format: u8, // 0=MH, 1=MR
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pub ecm: bool, // Error correction mode
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}
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impl Default for DccParams {
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fn default() -> Self {
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Self {
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resolution: true, // Fine
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speed: 3, // 9600
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width: 0, // A4
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length: 0, // A4
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format: 0, // MH
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ecm: false, // No ECM for simplicity
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}
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}
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}
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/// Bit rate codes for Class 2
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pub const BR_V27TER_2400: u8 = 0;
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pub const BR_V27TER_4800: u8 = 1;
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pub const BR_V29_7200: u8 = 2;
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pub const BR_V29_9600: u8 = 3;
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pub const BR_V17_7200: u8 = 4;
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pub const BR_V17_9600: u8 = 5;
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pub const BR_V17_12000: u8 = 6;
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pub const BR_V17_14400: u8 = 7;
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5
src/fax/class2/mod.rs
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5
src/fax/class2/mod.rs
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@@ -0,0 +1,5 @@
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pub mod send;
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pub mod commands;
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pub use send::Class2Send;
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pub use commands::Class2Commands;
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201
src/fax/class2/send.rs
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201
src/fax/class2/send.rs
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@@ -0,0 +1,201 @@
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use crate::error::{FaxError, Result};
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use crate::fax::class2::commands::{Class2Commands, DccParams, BR_V17_14400};
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use crate::modem::driver::ModemDriver;
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use crate::document::convert::Page;
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const DLE: u8 = 0x10;
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const ETX: u8 = 0x03;
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const DLE_ETX: [u8; 2] = [DLE, ETX];
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/// Class 2 Fax Sender - simpler than Class 1
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/// The modem handles T.30 protocol, HDLC framing, and negotiation automatically.
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pub struct Class2Send<'a> {
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driver: &'a mut ModemDriver,
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station_id: String,
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header: String,
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params: DccParams,
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}
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impl<'a> Class2Send<'a> {
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pub fn new(driver: &'a mut ModemDriver) -> Self {
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Self {
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driver,
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station_id: "TELFAX".to_string(),
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header: "Telfax Fax Server".to_string(),
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params: DccParams::default(),
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}
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}
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pub fn with_station_id(mut self, id: &str) -> Self {
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self.station_id = id.to_string();
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self
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}
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pub fn with_header(mut self, header: &str) -> Self {
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self.header = header.to_string();
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self
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}
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pub fn with_params(mut self, params: DccParams) -> Self {
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self.params = params;
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self
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}
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fn at(&mut self) -> crate::modem::at::AtChannel<'_> {
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crate::modem::at::AtChannel::new(self.driver)
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}
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/// Send fax document using Class 2 protocol
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/// Pages should be pre-encoded in T.4 MH format
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pub fn send_fax(&mut self, number: &str, pages: &[Page]) -> Result<()> {
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tracing::info!("Starting Class 2 fax to {}", number);
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// Enter Class 2 mode
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self.at().send_command(Class2Commands::ENTER_CLASS2, 5000)?;
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tracing::info!("Entered Class 2 mode");
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// Set station ID
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let station_cmd = Class2Commands::set_station_id(&self.station_id);
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self.at().send_command(&station_cmd, 3000)?;
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tracing::info!("Station ID set: {}", self.station_id);
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// Set header
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let header_cmd = Class2Commands::set_header(&self.header);
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self.at().send_command(&header_cmd, 3000)?;
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// Set capabilities
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let speed = if self.params.speed > 0 { self.params.speed } else { BR_V17_14400 };
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let dis_cmd = Class2Commands::set_dis_params(self.params.resolution, speed, self.params.ecm);
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self.at().send_command(&dis_cmd, 3000)?;
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// Dial
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self.dial(number)?;
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// Send pages
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for (i, page) in pages.iter().enumerate() {
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tracing::info!("Sending page {} of {}", i + 1, pages.len());
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self.send_page(page)?;
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let is_last = i == pages.len() - 1;
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self.end_page(is_last)?;
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}
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// Hang up
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self.hang_up()?;
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tracing::info!("Fax sent successfully");
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Ok(())
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}
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fn dial(&mut self, number: &str) -> Result<()> {
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self.driver.drain()?;
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let cmd = Class2Commands::dial(number);
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self.driver.write_raw(cmd.as_bytes())?;
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self.driver.write_raw(b"\r")?;
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self.driver.flush()?;
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// Wait for CONNECT or response
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let response = self.driver.read_until(b"\r\n", 60000)?;
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let text = String::from_utf8_lossy(&response);
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tracing::info!("Dial response: {}", text);
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// Check for successful connection
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if text.contains("NO CARRIER") || text.contains("BUSY") {
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return Err(FaxError::NoCarrier);
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}
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// Class 2: wait for fax session indicators
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// CONNECT indicates fax session is ready
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// The modem returns: CONNECT, +FCON: <params>
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let extra = self.driver.read_all(5000)?;
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let extra_text = String::from_utf8_lossy(&extra);
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tracing::info!("Session info: {}", extra_text);
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Ok(())
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}
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fn send_page(&mut self, page: &Page) -> Result<()> {
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// Start page transmission
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self.driver.write_raw(b"AT+FDT\r")?;
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self.driver.flush()?;
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// Wait for CONNECT
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let response = self.driver.read_until(b"CONNECT\r\n", 10000)?;
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let text = String::from_utf8_lossy(&response);
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tracing::debug!("FDT response: {}", text);
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if text.contains("ERROR") {
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return Err(FaxError::modem("FDT command failed"));
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}
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// Send T.4 MH encoded data
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// For Class 2, we need to:
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// 1. Send T.4 page data (with proper MH encoding)
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// 2. End with DLE ETX (0x10 0x03)
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// 3. Handle any DLE escapes in the data
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// TODO: The pixel data needs to be T.4 MH encoded first
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// For now, send raw pixel data (this won't work properly!)
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// We need to implement MH encoding
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tracing::warn!("Sending raw pixel data (MH encoding not yet implemented)");
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// Escape any DLE (0x10) bytes in the data by doubling them
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let escaped_data = self.escape_dle(&page.pixels);
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self.driver.write_raw(&escaped_data)?;
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self.driver.write_raw(&DLE_ETX)?;
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self.driver.flush()?;
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// Wait for page confirmation
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let result = self.driver.read_until(b"\r\n", 30000)?;
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let result_text = String::from_utf8_lossy(&result);
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tracing::info!("Page result: {}", result_text);
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// Check for errors
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if result_text.contains("ERROR") {
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return Err(FaxError::protocol("Page transmission failed"));
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}
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Ok(())
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}
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fn end_page(&mut self, last_page: bool) -> Result<()> {
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let cmd = Class2Commands::end_page(!last_page);
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self.driver.write_raw(cmd.as_bytes())?;
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self.driver.write_raw(b"\r")?;
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self.driver.flush()?;
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// Wait for confirmation
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let response = self.driver.read_until(b"\r\n", 10000)?;
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tracing::debug!("End page response: {}", String::from_utf8_lossy(&response));
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Ok(())
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}
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fn hang_up(&mut self) -> Result<()> {
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self.driver.write_raw(b"AT+FHNG=0\r")?;
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std::thread::sleep(std::time::Duration::from_millis(500));
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self.driver.drain()?;
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// Also send ATH to ensure hangup
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self.driver.write_raw(b"ATH\r")?;
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self.driver.drain()?;
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Ok(())
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}
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/// Escape DLE characters in fax data (Class 2 requires DLE doubling)
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fn escape_dle(&self, data: &[u8]) -> Vec<u8> {
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let mut escaped = Vec::with_capacity(data.len() * 2);
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for &byte in data {
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if byte == DLE {
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escaped.push(DLE);
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escaped.push(DLE); // Double DLE to escape it
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} else {
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escaped.push(byte);
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}
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}
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escaped
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}
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}
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@@ -2,6 +2,8 @@ pub mod t4;
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pub mod hdlc;
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pub mod negotiate;
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pub mod class1;
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pub mod class2;
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pub use class1::Class1Session;
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pub use class2::Class2Send;
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pub use t4::T4Codec;
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102
src/main.rs
102
src/main.rs
@@ -41,12 +41,18 @@ enum Commands {
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/// Resolution (standard/fine/superfine)
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#[arg(short, long, default_value = "fine")]
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resolution: String,
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/// Fax class (1 or 2). Class 2 is simpler but requires Class 2 capable modem.
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#[arg(short = 'c', long, default_value = "2")]
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class: String,
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},
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/// Interactively test the modem
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Test {
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/// Serial device path
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#[arg(default_value = "/dev/cu.usbmodem00000021")]
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device: String,
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/// Test Class 2 commands specifically
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#[arg(short = '2', long)]
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class2: bool,
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},
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/// Convert PDF to TIFF-F fax format (dry test)
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Convert {
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@@ -75,8 +81,9 @@ async fn main() -> Result<()> {
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match cli.command.unwrap_or(Commands::Serve { config: None }) {
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Commands::Detect { device } => cmd_detect(&device),
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Commands::Serve { config } => cmd_serve(config).await,
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Commands::Send { recipient, file, device, resolution } => cmd_send(&device, &recipient, &file, &resolution),
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Commands::Test { device } => cmd_test(&device),
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Commands::Send { recipient, file, device, resolution, class } =>
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cmd_send(&device, &recipient, &file, &resolution, &class),
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Commands::Test { device, class2 } => cmd_test(&device, class2),
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Commands::Convert { input, output, resolution } => cmd_convert(&input, output.as_deref(), &resolution),
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}
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}
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@@ -119,12 +126,11 @@ async fn cmd_serve(config_path: Option<String>) -> Result<()> {
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telfax::api::start_server(config, queue.clone()).await
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}
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fn cmd_send(device: &str, recipient: &str, file: &str, resolution: &str) -> Result<()> {
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info!("Sending fax to {} from {} using device {}", recipient, file, device);
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fn cmd_send(device: &str, recipient: &str, file: &str, resolution: &str, class: &str) -> Result<()> {
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info!("Sending fax to {} from {} using device {} (Class {})", recipient, file, device, class);
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let mut driver = ModemDriver::open(device, 115200)?;
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// Determine resolution
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let fax_resolution = match resolution.to_lowercase().as_str() {
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"standard" | "std" => FaxResolution::Standard,
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"fine" => FaxResolution::Fine,
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@@ -132,7 +138,6 @@ fn cmd_send(device: &str, recipient: &str, file: &str, resolution: &str) -> Resu
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_ => FaxResolution::Fine,
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};
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// Load document - handle PDF or image
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let path = std::path::Path::new(file);
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let doc = if file.to_lowercase().ends_with(".pdf") {
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info!("Converting PDF to fax format...");
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@@ -146,18 +151,31 @@ fn cmd_send(device: &str, recipient: &str, file: &str, resolution: &str) -> Resu
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let page = &doc.pages[0];
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info!("Document: {}x{} pixels, {} bytes", page.width_pels, page.rows, page.pixels.len());
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// TODO: Encode to T.4 MH before sending
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// For now, we send raw pixel data (modem will need T.4 encoded data)
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info!("WARNING: T.4 encoding not fully implemented - sending raw pixels");
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let mut sender = telfax::fax::class1::Class1Send::new(&mut driver);
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sender.send_fax(recipient, &page.pixels, page.width_pels, page.rows)?;
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// Choose fax class
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match class {
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"2" => {
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info!("Using Class 2 protocol");
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let mut sender = telfax::fax::class2::Class2Send::new(&mut driver)
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.with_station_id("TELFAX")
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.with_header("Telfax Fax Server");
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sender.send_fax(recipient, &doc.pages)?;
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}
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"1" => {
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info!("Using Class 1 protocol");
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info!("WARNING: T.4 encoding not fully implemented - sending raw pixels");
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let mut sender = telfax::fax::class1::Class1Send::new(&mut driver);
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sender.send_fax(recipient, &page.pixels, page.width_pels, page.rows)?;
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}
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_ => {
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return Err(telfax::error::FaxError::config(format!("Unknown fax class: {}", class)));
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}
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}
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info!("Fax sent successfully!");
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Ok(())
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}
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fn cmd_test(device: &str) -> Result<()> {
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fn cmd_test(device: &str, test_class2: bool) -> Result<()> {
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use std::io::{self, Write};
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println!("Opening modem on {} for interactive test...", device);
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@@ -167,29 +185,55 @@ fn cmd_test(device: &str) -> Result<()> {
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println!("\n=== Modem Info ===");
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println!("Model: {}", info.model);
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println!("Supports Class 1: {}", info.supports_class_1);
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println!("Supports Class 2: {}", info.supports_class_2);
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println!("TX Rates: {:?}", info.tx_rates);
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println!("\nTesting AT commands...");
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let mut at = telfax::modem::at::AtChannel::new(&mut driver);
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let tests = [
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||||
"AT",
|
||||
"AT+FCLASS=1",
|
||||
"AT+FTM=96",
|
||||
"AT+FRM=96",
|
||||
"AT+FTM=145",
|
||||
"AT+FRM=145",
|
||||
];
|
||||
if test_class2 && info.supports_class_2 {
|
||||
println!("\n=== Class 2 Specific Tests ===");
|
||||
let class2_tests = [
|
||||
("AT+FCLASS=?", "Query supported classes"),
|
||||
("AT+FCLASS=2", "Enter Class 2 mode"),
|
||||
("AT+FLID?", "Query station ID"),
|
||||
("AT+FLID=\"TELFAX\"", "Set station ID"),
|
||||
("AT+FDCC?", "Query current DCC"),
|
||||
("AT+FDCC=?", "Query supported DCC"),
|
||||
("AT+FDIS?", "Query DIS params"),
|
||||
("AT+FAA?", "Query adaptive answer"),
|
||||
];
|
||||
|
||||
for cmd in tests {
|
||||
print!(" {} ... ", cmd);
|
||||
io::stdout().flush().ok();
|
||||
match at.send_command(cmd, 3000) {
|
||||
Ok(resp) => {
|
||||
let last = resp.trim().lines().last().unwrap_or("");
|
||||
println!("OK ({})", last);
|
||||
for (cmd, desc) in class2_tests {
|
||||
print!(" {} ({}) ... ", cmd, desc);
|
||||
io::stdout().flush().ok();
|
||||
match at.send_command(cmd, 3000) {
|
||||
Ok(resp) => {
|
||||
let lines: Vec<&str> = resp.trim().lines().collect();
|
||||
let result = if lines.len() > 1 { lines[0] } else { "OK" };
|
||||
println!("✓ {}", result);
|
||||
}
|
||||
Err(e) => println!("✗ {}", e),
|
||||
}
|
||||
}
|
||||
} else {
|
||||
let tests = [
|
||||
"AT",
|
||||
"AT+FCLASS=1",
|
||||
"AT+FTM=96",
|
||||
"AT+FRM=96",
|
||||
];
|
||||
|
||||
for cmd in tests {
|
||||
print!(" {} ... ", cmd);
|
||||
io::stdout().flush().ok();
|
||||
match at.send_command(cmd, 3000) {
|
||||
Ok(resp) => {
|
||||
let last = resp.trim().lines().last().unwrap_or("");
|
||||
println!("OK ({})", last);
|
||||
}
|
||||
Err(e) => println!("ERROR: {}", e),
|
||||
}
|
||||
Err(e) => println!("ERROR: {}", e),
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
Reference in New Issue
Block a user