Zoltan Hudak
MAX3421E-based USB Host Shield Library
Dependents: UsbHostMAX3421E_Hello
Diff: SPP.cpp
- Revision:
- 0:84353c479782
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/SPP.cpp Sun Jul 12 20:39:26 2020 +0000
@@ -0,0 +1,829 @@
+/* Copyright (C) 2012 Kristian Lauszus, TKJ Electronics. All rights reserved.
+
+ This software may be distributed and modified under the terms of the GNU
+ General Public License version 2 (GPL2) as published by the Free Software
+ Foundation and appearing in the file GPL2.TXT included in the packaging of
+ this file. Please note that GPL2 Section 2[b] requires that all works based
+ on this software must also be made publicly available under the terms of
+ the GPL2 ("Copyleft").
+
+ Contact information
+ -------------------
+
+ Kristian Lauszus, TKJ Electronics
+ Web : http://www.tkjelectronics.com
+ e-mail : kristianl@tkjelectronics.com
+ */
+
+#include "SPP.h"
+// To enable serial debugging see "settings.h"
+//#define EXTRADEBUG // Uncomment to get even more debugging data
+//#define PRINTREPORT // Uncomment to print the report sent to the Arduino
+
+/*
+ * CRC (reversed crc) lookup table as calculated by the table generator in ETSI TS 101 369 V6.3.0.
+ */
+const uint8_t rfcomm_crc_table[256] PROGMEM = {/* reversed, 8-bit, poly=0x07 */
+ 0x00, 0x91, 0xE3, 0x72, 0x07, 0x96, 0xE4, 0x75, 0x0E, 0x9F, 0xED, 0x7C, 0x09, 0x98, 0xEA, 0x7B,
+ 0x1C, 0x8D, 0xFF, 0x6E, 0x1B, 0x8A, 0xF8, 0x69, 0x12, 0x83, 0xF1, 0x60, 0x15, 0x84, 0xF6, 0x67,
+ 0x38, 0xA9, 0xDB, 0x4A, 0x3F, 0xAE, 0xDC, 0x4D, 0x36, 0xA7, 0xD5, 0x44, 0x31, 0xA0, 0xD2, 0x43,
+ 0x24, 0xB5, 0xC7, 0x56, 0x23, 0xB2, 0xC0, 0x51, 0x2A, 0xBB, 0xC9, 0x58, 0x2D, 0xBC, 0xCE, 0x5F,
+ 0x70, 0xE1, 0x93, 0x02, 0x77, 0xE6, 0x94, 0x05, 0x7E, 0xEF, 0x9D, 0x0C, 0x79, 0xE8, 0x9A, 0x0B,
+ 0x6C, 0xFD, 0x8F, 0x1E, 0x6B, 0xFA, 0x88, 0x19, 0x62, 0xF3, 0x81, 0x10, 0x65, 0xF4, 0x86, 0x17,
+ 0x48, 0xD9, 0xAB, 0x3A, 0x4F, 0xDE, 0xAC, 0x3D, 0x46, 0xD7, 0xA5, 0x34, 0x41, 0xD0, 0xA2, 0x33,
+ 0x54, 0xC5, 0xB7, 0x26, 0x53, 0xC2, 0xB0, 0x21, 0x5A, 0xCB, 0xB9, 0x28, 0x5D, 0xCC, 0xBE, 0x2F,
+ 0xE0, 0x71, 0x03, 0x92, 0xE7, 0x76, 0x04, 0x95, 0xEE, 0x7F, 0x0D, 0x9C, 0xE9, 0x78, 0x0A, 0x9B,
+ 0xFC, 0x6D, 0x1F, 0x8E, 0xFB, 0x6A, 0x18, 0x89, 0xF2, 0x63, 0x11, 0x80, 0xF5, 0x64, 0x16, 0x87,
+ 0xD8, 0x49, 0x3B, 0xAA, 0xDF, 0x4E, 0x3C, 0xAD, 0xD6, 0x47, 0x35, 0xA4, 0xD1, 0x40, 0x32, 0xA3,
+ 0xC4, 0x55, 0x27, 0xB6, 0xC3, 0x52, 0x20, 0xB1, 0xCA, 0x5B, 0x29, 0xB8, 0xCD, 0x5C, 0x2E, 0xBF,
+ 0x90, 0x01, 0x73, 0xE2, 0x97, 0x06, 0x74, 0xE5, 0x9E, 0x0F, 0x7D, 0xEC, 0x99, 0x08, 0x7A, 0xEB,
+ 0x8C, 0x1D, 0x6F, 0xFE, 0x8B, 0x1A, 0x68, 0xF9, 0x82, 0x13, 0x61, 0xF0, 0x85, 0x14, 0x66, 0xF7,
+ 0xA8, 0x39, 0x4B, 0xDA, 0xAF, 0x3E, 0x4C, 0xDD, 0xA6, 0x37, 0x45, 0xD4, 0xA1, 0x30, 0x42, 0xD3,
+ 0xB4, 0x25, 0x57, 0xC6, 0xB3, 0x22, 0x50, 0xC1, 0xBA, 0x2B, 0x59, 0xC8, 0xBD, 0x2C, 0x5E, 0xCF
+};
+
+SPP::SPP(BTD *p, const char* name, const char* pin) :
+BluetoothService(p) // Pointer to BTD class instance - mandatory
+{
+ pBtd->btdName = name;
+ pBtd->btdPin = pin;
+
+ /* Set device cid for the SDP and RFCOMM channelse */
+ sdp_dcid[0] = 0x50; // 0x0050
+ sdp_dcid[1] = 0x00;
+ rfcomm_dcid[0] = 0x51; // 0x0051
+ rfcomm_dcid[1] = 0x00;
+
+ Reset();
+}
+
+void SPP::Reset() {
+ connected = false;
+ RFCOMMConnected = false;
+ SDPConnected = false;
+ waitForLastCommand = false;
+ l2cap_sdp_state = L2CAP_SDP_WAIT;
+ l2cap_rfcomm_state = L2CAP_RFCOMM_WAIT;
+ l2cap_event_flag = 0;
+ sppIndex = 0;
+ creditSent = false;
+}
+
+void SPP::disconnect() {
+ connected = false;
+ // First the two L2CAP channels has to be disconnected and then the HCI connection
+ if(RFCOMMConnected)
+ pBtd->l2cap_disconnection_request(hci_handle, ++identifier, rfcomm_scid, rfcomm_dcid);
+ if(RFCOMMConnected && SDPConnected)
+ wait_ms(1); // Add delay between commands
+ if(SDPConnected)
+ pBtd->l2cap_disconnection_request(hci_handle, ++identifier, sdp_scid, sdp_dcid);
+ l2cap_sdp_state = L2CAP_DISCONNECT_RESPONSE;
+}
+
+void SPP::ACLData(uint8_t* l2capinbuf) {
+ if(!connected) {
+ if(l2capinbuf[8] == L2CAP_CMD_CONNECTION_REQUEST) {
+ if((l2capinbuf[12] | (l2capinbuf[13] << 8)) == SDP_PSM && !pBtd->sdpConnectionClaimed) {
+ pBtd->sdpConnectionClaimed = true;
+ hci_handle = pBtd->hci_handle; // Store the HCI Handle for the connection
+ l2cap_sdp_state = L2CAP_SDP_WAIT; // Reset state
+ } else if((l2capinbuf[12] | (l2capinbuf[13] << 8)) == RFCOMM_PSM && !pBtd->rfcommConnectionClaimed) {
+ pBtd->rfcommConnectionClaimed = true;
+ hci_handle = pBtd->hci_handle; // Store the HCI Handle for the connection
+ l2cap_rfcomm_state = L2CAP_RFCOMM_WAIT; // Reset state
+ }
+ }
+ }
+
+ if(checkHciHandle(l2capinbuf, hci_handle)) { // acl_handle_ok
+ if((l2capinbuf[6] | (l2capinbuf[7] << 8)) == 0x0001U) { // l2cap_control - Channel ID for ACL-U
+ if(l2capinbuf[8] == L2CAP_CMD_COMMAND_REJECT) {
+#ifdef DEBUG_USB_HOST
+ Notify(PSTR("\r\nL2CAP Command Rejected - Reason: "), 0x80);
+ D_PrintHex<uint8_t > (l2capinbuf[13], 0x80);
+ Notify(PSTR(" "), 0x80);
+ D_PrintHex<uint8_t > (l2capinbuf[12], 0x80);
+ Notify(PSTR(" Data: "), 0x80);
+ D_PrintHex<uint8_t > (l2capinbuf[17], 0x80);
+ Notify(PSTR(" "), 0x80);
+ D_PrintHex<uint8_t > (l2capinbuf[16], 0x80);
+ Notify(PSTR(" "), 0x80);
+ D_PrintHex<uint8_t > (l2capinbuf[15], 0x80);
+ Notify(PSTR(" "), 0x80);
+ D_PrintHex<uint8_t > (l2capinbuf[14], 0x80);
+#endif
+ } else if(l2capinbuf[8] == L2CAP_CMD_CONNECTION_REQUEST) {
+#ifdef EXTRADEBUG
+ Notify(PSTR("\r\nL2CAP Connection Request - PSM: "), 0x80);
+ D_PrintHex<uint8_t > (l2capinbuf[13], 0x80);
+ Notify(PSTR(" "), 0x80);
+ D_PrintHex<uint8_t > (l2capinbuf[12], 0x80);
+ Notify(PSTR(" SCID: "), 0x80);
+ D_PrintHex<uint8_t > (l2capinbuf[15], 0x80);
+ Notify(PSTR(" "), 0x80);
+ D_PrintHex<uint8_t > (l2capinbuf[14], 0x80);
+ Notify(PSTR(" Identifier: "), 0x80);
+ D_PrintHex<uint8_t > (l2capinbuf[9], 0x80);
+#endif
+ if((l2capinbuf[12] | (l2capinbuf[13] << 8)) == SDP_PSM) { // It doesn't matter if it receives another reqeust, since it waits for the channel to disconnect in the L2CAP_SDP_DONE state, and the l2cap_event_flag will be cleared if so
+ identifier = l2capinbuf[9];
+ sdp_scid[0] = l2capinbuf[14];
+ sdp_scid[1] = l2capinbuf[15];
+ l2cap_set_flag(L2CAP_FLAG_CONNECTION_SDP_REQUEST);
+ } else if((l2capinbuf[12] | (l2capinbuf[13] << 8)) == RFCOMM_PSM) { // ----- || -----
+ identifier = l2capinbuf[9];
+ rfcomm_scid[0] = l2capinbuf[14];
+ rfcomm_scid[1] = l2capinbuf[15];
+ l2cap_set_flag(L2CAP_FLAG_CONNECTION_RFCOMM_REQUEST);
+ }
+ } else if(l2capinbuf[8] == L2CAP_CMD_CONFIG_RESPONSE) {
+ if((l2capinbuf[16] | (l2capinbuf[17] << 8)) == 0x0000) { // Success
+ if(l2capinbuf[12] == sdp_dcid[0] && l2capinbuf[13] == sdp_dcid[1]) {
+ //Notify(PSTR("\r\nSDP Configuration Complete"), 0x80);
+ l2cap_set_flag(L2CAP_FLAG_CONFIG_SDP_SUCCESS);
+ } else if(l2capinbuf[12] == rfcomm_dcid[0] && l2capinbuf[13] == rfcomm_dcid[1]) {
+ //Notify(PSTR("\r\nRFCOMM Configuration Complete"), 0x80);
+ l2cap_set_flag(L2CAP_FLAG_CONFIG_RFCOMM_SUCCESS);
+ }
+ }
+ } else if(l2capinbuf[8] == L2CAP_CMD_CONFIG_REQUEST) {
+ if(l2capinbuf[12] == sdp_dcid[0] && l2capinbuf[13] == sdp_dcid[1]) {
+ //Notify(PSTR("\r\nSDP Configuration Request"), 0x80);
+ pBtd->l2cap_config_response(hci_handle, l2capinbuf[9], sdp_scid);
+ } else if(l2capinbuf[12] == rfcomm_dcid[0] && l2capinbuf[13] == rfcomm_dcid[1]) {
+ //Notify(PSTR("\r\nRFCOMM Configuration Request"), 0x80);
+ pBtd->l2cap_config_response(hci_handle, l2capinbuf[9], rfcomm_scid);
+ }
+ } else if(l2capinbuf[8] == L2CAP_CMD_DISCONNECT_REQUEST) {
+ if(l2capinbuf[12] == sdp_dcid[0] && l2capinbuf[13] == sdp_dcid[1]) {
+ //Notify(PSTR("\r\nDisconnect Request: SDP Channel"), 0x80);
+ identifier = l2capinbuf[9];
+ l2cap_set_flag(L2CAP_FLAG_DISCONNECT_SDP_REQUEST);
+ } else if(l2capinbuf[12] == rfcomm_dcid[0] && l2capinbuf[13] == rfcomm_dcid[1]) {
+ //Notify(PSTR("\r\nDisconnect Request: RFCOMM Channel"), 0x80);
+ identifier = l2capinbuf[9];
+ l2cap_set_flag(L2CAP_FLAG_DISCONNECT_RFCOMM_REQUEST);
+ }
+ } else if(l2capinbuf[8] == L2CAP_CMD_DISCONNECT_RESPONSE) {
+ if(l2capinbuf[12] == sdp_scid[0] && l2capinbuf[13] == sdp_scid[1]) {
+ //Notify(PSTR("\r\nDisconnect Response: SDP Channel"), 0x80);
+ identifier = l2capinbuf[9];
+ l2cap_set_flag(L2CAP_FLAG_DISCONNECT_RESPONSE);
+ } else if(l2capinbuf[12] == rfcomm_scid[0] && l2capinbuf[13] == rfcomm_scid[1]) {
+ //Notify(PSTR("\r\nDisconnect Response: RFCOMM Channel"), 0x80);
+ identifier = l2capinbuf[9];
+ l2cap_set_flag(L2CAP_FLAG_DISCONNECT_RESPONSE);
+ }
+ } else if(l2capinbuf[8] == L2CAP_CMD_INFORMATION_REQUEST) {
+#ifdef DEBUG_USB_HOST
+ Notify(PSTR("\r\nInformation request"), 0x80);
+#endif
+ identifier = l2capinbuf[9];
+ pBtd->l2cap_information_response(hci_handle, identifier, l2capinbuf[12], l2capinbuf[13]);
+ }
+#ifdef EXTRADEBUG
+ else {
+ Notify(PSTR("\r\nL2CAP Unknown Signaling Command: "), 0x80);
+ D_PrintHex<uint8_t > (l2capinbuf[8], 0x80);
+ }
+#endif
+ } else if(l2capinbuf[6] == sdp_dcid[0] && l2capinbuf[7] == sdp_dcid[1]) { // SDP
+ if(l2capinbuf[8] == SDP_SERVICE_SEARCH_ATTRIBUTE_REQUEST_PDU) {
+ if(((l2capinbuf[16] << 8 | l2capinbuf[17]) == SERIALPORT_UUID) || ((l2capinbuf[16] << 8 | l2capinbuf[17]) == 0x0000 && (l2capinbuf[18] << 8 | l2capinbuf[19]) == SERIALPORT_UUID)) { // Check if it's sending the full UUID, see: https://www.bluetooth.org/Technical/AssignedNumbers/service_discovery.htm, we will just check the first four bytes
+ if(firstMessage) {
+ serialPortResponse1(l2capinbuf[9], l2capinbuf[10]);
+ firstMessage = false;
+ } else {
+ serialPortResponse2(l2capinbuf[9], l2capinbuf[10]); // Serialport continuation state
+ firstMessage = true;
+ }
+ } else if(((l2capinbuf[16] << 8 | l2capinbuf[17]) == L2CAP_UUID) || ((l2capinbuf[16] << 8 | l2capinbuf[17]) == 0x0000 && (l2capinbuf[18] << 8 | l2capinbuf[19]) == L2CAP_UUID)) {
+ if(firstMessage) {
+ l2capResponse1(l2capinbuf[9], l2capinbuf[10]);
+ firstMessage = false;
+ } else {
+ l2capResponse2(l2capinbuf[9], l2capinbuf[10]); // L2CAP continuation state
+ firstMessage = true;
+ }
+ } else
+ serviceNotSupported(l2capinbuf[9], l2capinbuf[10]); // The service is not supported
+#ifdef EXTRADEBUG
+ Notify(PSTR("\r\nUUID: "), 0x80);
+ uint16_t uuid;
+ if((l2capinbuf[16] << 8 | l2capinbuf[17]) == 0x0000) // Check if it's sending the UUID as a 128-bit UUID
+ uuid = (l2capinbuf[18] << 8 | l2capinbuf[19]);
+ else // Short UUID
+ uuid = (l2capinbuf[16] << 8 | l2capinbuf[17]);
+ D_PrintHex<uint16_t > (uuid, 0x80);
+
+ Notify(PSTR("\r\nLength: "), 0x80);
+ uint16_t length = l2capinbuf[11] << 8 | l2capinbuf[12];
+ D_PrintHex<uint16_t > (length, 0x80);
+ Notify(PSTR("\r\nData: "), 0x80);
+ for(uint8_t i = 0; i < length; i++) {
+ D_PrintHex<uint8_t > (l2capinbuf[13 + i], 0x80);
+ Notify(PSTR(" "), 0x80);
+ }
+#endif
+ }
+#ifdef EXTRADEBUG
+ else {
+ Notify(PSTR("\r\nUnknown PDU: "), 0x80);
+ D_PrintHex<uint8_t > (l2capinbuf[8], 0x80);
+ }
+#endif
+ } else if(l2capinbuf[6] == rfcomm_dcid[0] && l2capinbuf[7] == rfcomm_dcid[1]) { // RFCOMM
+ rfcommChannel = l2capinbuf[8] & 0xF8;
+ rfcommDirection = l2capinbuf[8] & 0x04;
+ rfcommCommandResponse = l2capinbuf[8] & 0x02;
+ rfcommChannelType = l2capinbuf[9] & 0xEF;
+ rfcommPfBit = l2capinbuf[9] & 0x10;
+
+ if(rfcommChannel >> 3 != 0x00)
+ rfcommChannelConnection = rfcommChannel;
+
+#ifdef EXTRADEBUG
+ Notify(PSTR("\r\nRFCOMM Channel: "), 0x80);
+ D_PrintHex<uint8_t > (rfcommChannel >> 3, 0x80);
+ Notify(PSTR(" Direction: "), 0x80);
+ D_PrintHex<uint8_t > (rfcommDirection >> 2, 0x80);
+ Notify(PSTR(" CommandResponse: "), 0x80);
+ D_PrintHex<uint8_t > (rfcommCommandResponse >> 1, 0x80);
+ Notify(PSTR(" ChannelType: "), 0x80);
+ D_PrintHex<uint8_t > (rfcommChannelType, 0x80);
+ Notify(PSTR(" PF_BIT: "), 0x80);
+ D_PrintHex<uint8_t > (rfcommPfBit, 0x80);
+#endif
+ if(rfcommChannelType == RFCOMM_DISC) {
+#ifdef DEBUG_USB_HOST
+ Notify(PSTR("\r\nReceived Disconnect RFCOMM Command on channel: "), 0x80);
+ D_PrintHex<uint8_t > (rfcommChannel >> 3, 0x80);
+#endif
+ connected = false;
+ sendRfcomm(rfcommChannel, rfcommDirection, rfcommCommandResponse, RFCOMM_UA, rfcommPfBit, rfcommbuf, 0x00); // UA Command
+ }
+ if(connected) {
+ /* Read the incoming message */
+ if(rfcommChannelType == RFCOMM_UIH && rfcommChannel == rfcommChannelConnection) {
+ uint8_t length = l2capinbuf[10] >> 1; // Get length
+ uint8_t offset = l2capinbuf[4] - length - 4; // Check if there is credit
+ if(checkFcs(&l2capinbuf[8], l2capinbuf[11 + length + offset])) {
+ uint8_t i = 0;
+ for(; i < length; i++) {
+ if(rfcommAvailable + i >= sizeof (rfcommDataBuffer)) {
+#ifdef DEBUG_USB_HOST
+ Notify(PSTR("\r\nWarning: Buffer is full!"), 0x80);
+#endif
+ break;
+ }
+ rfcommDataBuffer[rfcommAvailable + i] = l2capinbuf[11 + i + offset];
+ }
+ rfcommAvailable += i;
+#ifdef EXTRADEBUG
+ Notify(PSTR("\r\nRFCOMM Data Available: "), 0x80);
+ Notify(rfcommAvailable, 0x80);
+ if(offset) {
+ Notify(PSTR(" - Credit: 0x"), 0x80);
+ D_PrintHex<uint8_t > (l2capinbuf[11], 0x80);
+ }
+#endif
+ }
+#ifdef DEBUG_USB_HOST
+ else
+ Notify(PSTR("\r\nError in FCS checksum!"), 0x80);
+#endif
+#ifdef PRINTREPORT // Uncomment "#define PRINTREPORT" to print the report send to the Arduino via Bluetooth
+ for(uint8_t i = 0; i < length; i++)
+ Notifyc(l2capinbuf[i + 11 + offset], 0x80);
+#endif
+ } else if(rfcommChannelType == RFCOMM_UIH && l2capinbuf[11] == BT_RFCOMM_RPN_CMD) { // UIH Remote Port Negotiation Command
+#ifdef DEBUG_USB_HOST
+ Notify(PSTR("\r\nReceived UIH Remote Port Negotiation Command"), 0x80);
+#endif
+ rfcommbuf[0] = BT_RFCOMM_RPN_RSP; // Command
+ rfcommbuf[1] = l2capinbuf[12]; // Length and shiftet like so: length << 1 | 1
+ rfcommbuf[2] = l2capinbuf[13]; // Channel: channel << 1 | 1
+ rfcommbuf[3] = l2capinbuf[14]; // Pre difined for Bluetooth, see 5.5.3 of TS 07.10 Adaption for RFCOMM
+ rfcommbuf[4] = l2capinbuf[15]; // Priority
+ rfcommbuf[5] = l2capinbuf[16]; // Timer
+ rfcommbuf[6] = l2capinbuf[17]; // Max Fram Size LSB
+ rfcommbuf[7] = l2capinbuf[18]; // Max Fram Size MSB
+ rfcommbuf[8] = l2capinbuf[19]; // MaxRatransm.
+ rfcommbuf[9] = l2capinbuf[20]; // Number of Frames
+ sendRfcomm(rfcommChannel, rfcommDirection, 0, RFCOMM_UIH, rfcommPfBit, rfcommbuf, 0x0A); // UIH Remote Port Negotiation Response
+ } else if(rfcommChannelType == RFCOMM_UIH && l2capinbuf[11] == BT_RFCOMM_MSC_CMD) { // UIH Modem Status Command
+#ifdef DEBUG_USB_HOST
+ Notify(PSTR("\r\nSend UIH Modem Status Response"), 0x80);
+#endif
+ rfcommbuf[0] = BT_RFCOMM_MSC_RSP; // UIH Modem Status Response
+ rfcommbuf[1] = 2 << 1 | 1; // Length and shiftet like so: length << 1 | 1
+ rfcommbuf[2] = l2capinbuf[13]; // Channel: (1 << 0) | (1 << 1) | (0 << 2) | (channel << 3)
+ rfcommbuf[3] = l2capinbuf[14];
+ sendRfcomm(rfcommChannel, rfcommDirection, 0, RFCOMM_UIH, rfcommPfBit, rfcommbuf, 0x04);
+ }
+ } else {
+ if(rfcommChannelType == RFCOMM_SABM) { // SABM Command - this is sent twice: once for channel 0 and then for the channel to establish
+#ifdef DEBUG_USB_HOST
+ Notify(PSTR("\r\nReceived SABM Command"), 0x80);
+#endif
+ sendRfcomm(rfcommChannel, rfcommDirection, rfcommCommandResponse, RFCOMM_UA, rfcommPfBit, rfcommbuf, 0x00); // UA Command
+ } else if(rfcommChannelType == RFCOMM_UIH && l2capinbuf[11] == BT_RFCOMM_PN_CMD) { // UIH Parameter Negotiation Command
+#ifdef DEBUG_USB_HOST
+ Notify(PSTR("\r\nReceived UIH Parameter Negotiation Command"), 0x80);
+#endif
+ rfcommbuf[0] = BT_RFCOMM_PN_RSP; // UIH Parameter Negotiation Response
+ rfcommbuf[1] = l2capinbuf[12]; // Length and shiftet like so: length << 1 | 1
+ rfcommbuf[2] = l2capinbuf[13]; // Channel: channel << 1 | 1
+ rfcommbuf[3] = 0xE0; // Pre difined for Bluetooth, see 5.5.3 of TS 07.10 Adaption for RFCOMM
+ rfcommbuf[4] = 0x00; // Priority
+ rfcommbuf[5] = 0x00; // Timer
+ rfcommbuf[6] = BULK_MAXPKTSIZE - 14; // Max Fram Size LSB - set to the size of received data (50)
+ rfcommbuf[7] = 0x00; // Max Fram Size MSB
+ rfcommbuf[8] = 0x00; // MaxRatransm.
+ rfcommbuf[9] = 0x00; // Number of Frames
+ sendRfcomm(rfcommChannel, rfcommDirection, 0, RFCOMM_UIH, rfcommPfBit, rfcommbuf, 0x0A);
+ } else if(rfcommChannelType == RFCOMM_UIH && l2capinbuf[11] == BT_RFCOMM_MSC_CMD) { // UIH Modem Status Command
+#ifdef DEBUG_USB_HOST
+ Notify(PSTR("\r\nSend UIH Modem Status Response"), 0x80);
+#endif
+ rfcommbuf[0] = BT_RFCOMM_MSC_RSP; // UIH Modem Status Response
+ rfcommbuf[1] = 2 << 1 | 1; // Length and shiftet like so: length << 1 | 1
+ rfcommbuf[2] = l2capinbuf[13]; // Channel: (1 << 0) | (1 << 1) | (0 << 2) | (channel << 3)
+ rfcommbuf[3] = l2capinbuf[14];
+ sendRfcomm(rfcommChannel, rfcommDirection, 0, RFCOMM_UIH, rfcommPfBit, rfcommbuf, 0x04);
+
+ wait_ms(1);
+#ifdef DEBUG_USB_HOST
+ Notify(PSTR("\r\nSend UIH Modem Status Command"), 0x80);
+#endif
+ rfcommbuf[0] = BT_RFCOMM_MSC_CMD; // UIH Modem Status Command
+ rfcommbuf[1] = 2 << 1 | 1; // Length and shiftet like so: length << 1 | 1
+ rfcommbuf[2] = l2capinbuf[13]; // Channel: (1 << 0) | (1 << 1) | (0 << 2) | (channel << 3)
+ rfcommbuf[3] = 0x8D; // Can receive frames (YES), Ready to Communicate (YES), Ready to Receive (YES), Incomig Call (NO), Data is Value (YES)
+
+ sendRfcomm(rfcommChannel, rfcommDirection, 0, RFCOMM_UIH, rfcommPfBit, rfcommbuf, 0x04);
+ } else if(rfcommChannelType == RFCOMM_UIH && l2capinbuf[11] == BT_RFCOMM_MSC_RSP) { // UIH Modem Status Response
+ if(!creditSent) {
+#ifdef DEBUG_USB_HOST
+ Notify(PSTR("\r\nSend UIH Command with credit"), 0x80);
+#endif
+ sendRfcommCredit(rfcommChannelConnection, rfcommDirection, 0, RFCOMM_UIH, 0x10, sizeof (rfcommDataBuffer)); // Send credit
+ creditSent = true;
+ timer = (uint32_t)millis();
+ waitForLastCommand = true;
+ }
+ } else if(rfcommChannelType == RFCOMM_UIH && l2capinbuf[10] == 0x01) { // UIH Command with credit
+#ifdef DEBUG_USB_HOST
+ Notify(PSTR("\r\nReceived UIH Command with credit"), 0x80);
+#endif
+ } else if(rfcommChannelType == RFCOMM_UIH && l2capinbuf[11] == BT_RFCOMM_RPN_CMD) { // UIH Remote Port Negotiation Command
+#ifdef DEBUG_USB_HOST
+ Notify(PSTR("\r\nReceived UIH Remote Port Negotiation Command"), 0x80);
+#endif
+ rfcommbuf[0] = BT_RFCOMM_RPN_RSP; // Command
+ rfcommbuf[1] = l2capinbuf[12]; // Length and shiftet like so: length << 1 | 1
+ rfcommbuf[2] = l2capinbuf[13]; // Channel: channel << 1 | 1
+ rfcommbuf[3] = l2capinbuf[14]; // Pre difined for Bluetooth, see 5.5.3 of TS 07.10 Adaption for RFCOMM
+ rfcommbuf[4] = l2capinbuf[15]; // Priority
+ rfcommbuf[5] = l2capinbuf[16]; // Timer
+ rfcommbuf[6] = l2capinbuf[17]; // Max Fram Size LSB
+ rfcommbuf[7] = l2capinbuf[18]; // Max Fram Size MSB
+ rfcommbuf[8] = l2capinbuf[19]; // MaxRatransm.
+ rfcommbuf[9] = l2capinbuf[20]; // Number of Frames
+ sendRfcomm(rfcommChannel, rfcommDirection, 0, RFCOMM_UIH, rfcommPfBit, rfcommbuf, 0x0A); // UIH Remote Port Negotiation Response
+#ifdef DEBUG_USB_HOST
+ Notify(PSTR("\r\nRFCOMM Connection is now established\r\n"), 0x80);
+#endif
+ onInit();
+ }
+#ifdef EXTRADEBUG
+ else if(rfcommChannelType != RFCOMM_DISC) {
+ Notify(PSTR("\r\nUnsupported RFCOMM Data - ChannelType: "), 0x80);
+ D_PrintHex<uint8_t > (rfcommChannelType, 0x80);
+ Notify(PSTR(" Command: "), 0x80);
+ D_PrintHex<uint8_t > (l2capinbuf[11], 0x80);
+ }
+#endif
+ }
+ }
+#ifdef EXTRADEBUG
+ else {
+ Notify(PSTR("\r\nUnsupported L2CAP Data - Channel ID: "), 0x80);
+ D_PrintHex<uint8_t > (l2capinbuf[7], 0x80);
+ Notify(PSTR(" "), 0x80);
+ D_PrintHex<uint8_t > (l2capinbuf[6], 0x80);
+ }
+#endif
+ SDP_task();
+ RFCOMM_task();
+ }
+}
+
+void SPP::Run() {
+ if(waitForLastCommand && (int32_t)((uint32_t)millis() - timer) > 100) { // We will only wait 100ms and see if the UIH Remote Port Negotiation Command is send, as some deviced don't send it
+#ifdef DEBUG_USB_HOST
+ Notify(PSTR("\r\nRFCOMM Connection is now established - Automatic\r\n"), 0x80);
+#endif
+ onInit();
+ }
+ send(); // Send all bytes currently in the buffer
+}
+
+void SPP::onInit() {
+ creditSent = false;
+ waitForLastCommand = false;
+ connected = true; // The RFCOMM channel is now established
+ sppIndex = 0;
+ if(pFuncOnInit)
+ pFuncOnInit(); // Call the user function
+};
+
+void SPP::SDP_task() {
+ switch(l2cap_sdp_state) {
+ case L2CAP_SDP_WAIT:
+ if(l2cap_check_flag(L2CAP_FLAG_CONNECTION_SDP_REQUEST)) {
+ l2cap_clear_flag(L2CAP_FLAG_CONNECTION_SDP_REQUEST); // Clear flag
+#ifdef DEBUG_USB_HOST
+ Notify(PSTR("\r\nSDP Incoming Connection Request"), 0x80);
+#endif
+ pBtd->l2cap_connection_response(hci_handle, identifier, sdp_dcid, sdp_scid, PENDING);
+ wait_ms(1);
+ pBtd->l2cap_connection_response(hci_handle, identifier, sdp_dcid, sdp_scid, SUCCESSFUL);
+ identifier++;
+ wait_ms(1);
+ pBtd->l2cap_config_request(hci_handle, identifier, sdp_scid);
+ l2cap_sdp_state = L2CAP_SDP_SUCCESS;
+ } else if(l2cap_check_flag(L2CAP_FLAG_DISCONNECT_SDP_REQUEST)) {
+ l2cap_clear_flag(L2CAP_FLAG_DISCONNECT_SDP_REQUEST); // Clear flag
+ SDPConnected = false;
+#ifdef DEBUG_USB_HOST
+ Notify(PSTR("\r\nDisconnected SDP Channel"), 0x80);
+#endif
+ pBtd->l2cap_disconnection_response(hci_handle, identifier, sdp_dcid, sdp_scid);
+ }
+ break;
+ case L2CAP_SDP_SUCCESS:
+ if(l2cap_check_flag(L2CAP_FLAG_CONFIG_SDP_SUCCESS)) {
+ l2cap_clear_flag(L2CAP_FLAG_CONFIG_SDP_SUCCESS); // Clear flag
+#ifdef DEBUG_USB_HOST
+ Notify(PSTR("\r\nSDP Successfully Configured"), 0x80);
+#endif
+ firstMessage = true; // Reset bool
+ SDPConnected = true;
+ l2cap_sdp_state = L2CAP_SDP_WAIT;
+ }
+ break;
+
+ case L2CAP_DISCONNECT_RESPONSE: // This is for both disconnection response from the RFCOMM and SDP channel if they were connected
+ if(l2cap_check_flag(L2CAP_FLAG_DISCONNECT_RESPONSE)) {
+#ifdef DEBUG_USB_HOST
+ Notify(PSTR("\r\nDisconnected L2CAP Connection"), 0x80);
+#endif
+ pBtd->hci_disconnect(hci_handle);
+ hci_handle = -1; // Reset handle
+ Reset();
+ }
+ break;
+ }
+}
+
+void SPP::RFCOMM_task() {
+ switch(l2cap_rfcomm_state) {
+ case L2CAP_RFCOMM_WAIT:
+ if(l2cap_check_flag(L2CAP_FLAG_CONNECTION_RFCOMM_REQUEST)) {
+ l2cap_clear_flag(L2CAP_FLAG_CONNECTION_RFCOMM_REQUEST); // Clear flag
+#ifdef DEBUG_USB_HOST
+ Notify(PSTR("\r\nRFCOMM Incoming Connection Request"), 0x80);
+#endif
+ pBtd->l2cap_connection_response(hci_handle, identifier, rfcomm_dcid, rfcomm_scid, PENDING);
+ wait_ms(1);
+ pBtd->l2cap_connection_response(hci_handle, identifier, rfcomm_dcid, rfcomm_scid, SUCCESSFUL);
+ identifier++;
+ wait_ms(1);
+ pBtd->l2cap_config_request(hci_handle, identifier, rfcomm_scid);
+ l2cap_rfcomm_state = L2CAP_RFCOMM_SUCCESS;
+ } else if(l2cap_check_flag(L2CAP_FLAG_DISCONNECT_RFCOMM_REQUEST)) {
+ l2cap_clear_flag(L2CAP_FLAG_DISCONNECT_RFCOMM_REQUEST); // Clear flag
+ RFCOMMConnected = false;
+ connected = false;
+#ifdef DEBUG_USB_HOST
+ Notify(PSTR("\r\nDisconnected RFCOMM Channel"), 0x80);
+#endif
+ pBtd->l2cap_disconnection_response(hci_handle, identifier, rfcomm_dcid, rfcomm_scid);
+ }
+ break;
+ case L2CAP_RFCOMM_SUCCESS:
+ if(l2cap_check_flag(L2CAP_FLAG_CONFIG_RFCOMM_SUCCESS)) {
+ l2cap_clear_flag(L2CAP_FLAG_CONFIG_RFCOMM_SUCCESS); // Clear flag
+#ifdef DEBUG_USB_HOST
+ Notify(PSTR("\r\nRFCOMM Successfully Configured"), 0x80);
+#endif
+ rfcommAvailable = 0; // Reset number of bytes available
+ bytesRead = 0; // Reset number of bytes received
+ RFCOMMConnected = true;
+ l2cap_rfcomm_state = L2CAP_RFCOMM_WAIT;
+ }
+ break;
+ }
+}
+/************************************************************/
+/* SDP Commands */
+
+/************************************************************/
+void SPP::SDP_Command(uint8_t* data, uint8_t nbytes) { // See page 223 in the Bluetooth specs
+ pBtd->L2CAP_Command(hci_handle, data, nbytes, sdp_scid[0], sdp_scid[1]);
+}
+
+void SPP::serviceNotSupported(uint8_t transactionIDHigh, uint8_t transactionIDLow) { // See page 235 in the Bluetooth specs
+ l2capoutbuf[0] = SDP_SERVICE_SEARCH_ATTRIBUTE_RESPONSE_PDU;
+ l2capoutbuf[1] = transactionIDHigh;
+ l2capoutbuf[2] = transactionIDLow;
+ l2capoutbuf[3] = 0x00; // MSB Parameter Length
+ l2capoutbuf[4] = 0x05; // LSB Parameter Length = 5
+ l2capoutbuf[5] = 0x00; // MSB AttributeListsByteCount
+ l2capoutbuf[6] = 0x02; // LSB AttributeListsByteCount = 2
+
+ /* Attribute ID/Value Sequence: */
+ l2capoutbuf[7] = 0x35; // Data element sequence - length in next byte
+ l2capoutbuf[8] = 0x00; // Length = 0
+ l2capoutbuf[9] = 0x00; // No continuation state
+
+ SDP_Command(l2capoutbuf, 10);
+}
+
+void SPP::serialPortResponse1(uint8_t transactionIDHigh, uint8_t transactionIDLow) {
+ l2capoutbuf[0] = SDP_SERVICE_SEARCH_ATTRIBUTE_RESPONSE_PDU;
+ l2capoutbuf[1] = transactionIDHigh;
+ l2capoutbuf[2] = transactionIDLow;
+ l2capoutbuf[3] = 0x00; // MSB Parameter Length
+ l2capoutbuf[4] = 0x2B; // LSB Parameter Length = 43
+ l2capoutbuf[5] = 0x00; // MSB AttributeListsByteCount
+ l2capoutbuf[6] = 0x26; // LSB AttributeListsByteCount = 38
+
+ /* Attribute ID/Value Sequence: */
+ l2capoutbuf[7] = 0x36; // Data element sequence - length in next two bytes
+ l2capoutbuf[8] = 0x00; // MSB Length
+ l2capoutbuf[9] = 0x3C; // LSB Length = 60
+
+ l2capoutbuf[10] = 0x36; // Data element sequence - length in next two bytes
+ l2capoutbuf[11] = 0x00; // MSB Length
+ l2capoutbuf[12] = 0x39; // LSB Length = 57
+
+ l2capoutbuf[13] = 0x09; // Unsigned Integer - length 2 bytes
+ l2capoutbuf[14] = 0x00; // MSB ServiceRecordHandle
+ l2capoutbuf[15] = 0x00; // LSB ServiceRecordHandle
+ l2capoutbuf[16] = 0x0A; // Unsigned int - length 4 bytes
+ l2capoutbuf[17] = 0x00; // ServiceRecordHandle value - TODO: Is this related to HCI_Handle?
+ l2capoutbuf[18] = 0x01;
+ l2capoutbuf[19] = 0x00;
+ l2capoutbuf[20] = 0x06;
+
+ l2capoutbuf[21] = 0x09; // Unsigned Integer - length 2 bytes
+ l2capoutbuf[22] = 0x00; // MSB ServiceClassIDList
+ l2capoutbuf[23] = 0x01; // LSB ServiceClassIDList
+ l2capoutbuf[24] = 0x35; // Data element sequence - length in next byte
+ l2capoutbuf[25] = 0x03; // Length = 3
+ l2capoutbuf[26] = 0x19; // UUID (universally unique identifier) - length = 2 bytes
+ l2capoutbuf[27] = 0x11; // MSB SerialPort
+ l2capoutbuf[28] = 0x01; // LSB SerialPort
+
+ l2capoutbuf[29] = 0x09; // Unsigned Integer - length 2 bytes
+ l2capoutbuf[30] = 0x00; // MSB ProtocolDescriptorList
+ l2capoutbuf[31] = 0x04; // LSB ProtocolDescriptorList
+ l2capoutbuf[32] = 0x35; // Data element sequence - length in next byte
+ l2capoutbuf[33] = 0x0C; // Length = 12
+
+ l2capoutbuf[34] = 0x35; // Data element sequence - length in next byte
+ l2capoutbuf[35] = 0x03; // Length = 3
+ l2capoutbuf[36] = 0x19; // UUID (universally unique identifier) - length = 2 bytes
+ l2capoutbuf[37] = 0x01; // MSB L2CAP
+ l2capoutbuf[38] = 0x00; // LSB L2CAP
+
+ l2capoutbuf[39] = 0x35; // Data element sequence - length in next byte
+ l2capoutbuf[40] = 0x05; // Length = 5
+ l2capoutbuf[41] = 0x19; // UUID (universally unique identifier) - length = 2 bytes
+ l2capoutbuf[42] = 0x00; // MSB RFCOMM
+ l2capoutbuf[43] = 0x03; // LSB RFCOMM
+ l2capoutbuf[44] = 0x08; // Unsigned Integer - length 1 byte
+
+ l2capoutbuf[45] = 0x02; // ContinuationState - Two more bytes
+ l2capoutbuf[46] = 0x00; // MSB length
+ l2capoutbuf[47] = 0x19; // LSB length = 25 more bytes to come
+
+ SDP_Command(l2capoutbuf, 48);
+}
+
+void SPP::serialPortResponse2(uint8_t transactionIDHigh, uint8_t transactionIDLow) {
+ l2capoutbuf[0] = SDP_SERVICE_SEARCH_ATTRIBUTE_RESPONSE_PDU;
+ l2capoutbuf[1] = transactionIDHigh;
+ l2capoutbuf[2] = transactionIDLow;
+ l2capoutbuf[3] = 0x00; // MSB Parameter Length
+ l2capoutbuf[4] = 0x1C; // LSB Parameter Length = 28
+ l2capoutbuf[5] = 0x00; // MSB AttributeListsByteCount
+ l2capoutbuf[6] = 0x19; // LSB AttributeListsByteCount = 25
+
+ /* Attribute ID/Value Sequence: */
+ l2capoutbuf[7] = 0x01; // Channel 1 - TODO: Try different values, so multiple servers can be used at once
+
+ l2capoutbuf[8] = 0x09; // Unsigned Integer - length 2 bytes
+ l2capoutbuf[9] = 0x00; // MSB LanguageBaseAttributeIDList
+ l2capoutbuf[10] = 0x06; // LSB LanguageBaseAttributeIDList
+ l2capoutbuf[11] = 0x35; // Data element sequence - length in next byte
+ l2capoutbuf[12] = 0x09; // Length = 9
+
+ // Identifier representing the natural language = en = English - see: "ISO 639:1988"
+ l2capoutbuf[13] = 0x09; // Unsigned Integer - length 2 bytes
+ l2capoutbuf[14] = 0x65; // 'e'
+ l2capoutbuf[15] = 0x6E; // 'n'
+
+ // "The second element of each triplet contains an identifier that specifies a character encoding used for the language"
+ // Encoding is set to 106 (UTF-8) - see: http://www.iana.org/assignments/character-sets/character-sets.xhtml
+ l2capoutbuf[16] = 0x09; // Unsigned Integer - length 2 bytes
+ l2capoutbuf[17] = 0x00; // MSB of character encoding
+ l2capoutbuf[18] = 0x6A; // LSB of character encoding (106)
+
+ // Attribute ID that serves as the base attribute ID for the natural language in the service record
+ // "To facilitate the retrieval of human-readable universal attributes in a principal language, the base attribute ID value for the primary language supported by a service record shall be 0x0100"
+ l2capoutbuf[19] = 0x09; // Unsigned Integer - length 2 bytes
+ l2capoutbuf[20] = 0x01;
+ l2capoutbuf[21] = 0x00;
+
+ l2capoutbuf[22] = 0x09; // Unsigned Integer - length 2 bytes
+ l2capoutbuf[23] = 0x01; // MSB ServiceDescription
+ l2capoutbuf[24] = 0x00; // LSB ServiceDescription
+
+ l2capoutbuf[25] = 0x25; // Text string - length in next byte
+ l2capoutbuf[26] = 0x05; // Name length
+ l2capoutbuf[27] = 'T';
+ l2capoutbuf[28] = 'K';
+ l2capoutbuf[29] = 'J';
+ l2capoutbuf[30] = 'S';
+ l2capoutbuf[31] = 'P';
+ l2capoutbuf[32] = 0x00; // No continuation state
+
+ SDP_Command(l2capoutbuf, 33);
+}
+
+void SPP::l2capResponse1(uint8_t transactionIDHigh, uint8_t transactionIDLow) {
+ serialPortResponse1(transactionIDHigh, transactionIDLow); // These has to send all the supported functions, since it only supports virtual serialport it just sends the message again
+}
+
+void SPP::l2capResponse2(uint8_t transactionIDHigh, uint8_t transactionIDLow) {
+ serialPortResponse2(transactionIDHigh, transactionIDLow); // Same data as serialPortResponse2
+}
+/************************************************************/
+/* RFCOMM Commands */
+
+/************************************************************/
+void SPP::RFCOMM_Command(uint8_t* data, uint8_t nbytes) {
+ pBtd->L2CAP_Command(hci_handle, data, nbytes, rfcomm_scid[0], rfcomm_scid[1]);
+}
+
+void SPP::sendRfcomm(uint8_t channel, uint8_t direction, uint8_t CR, uint8_t channelType, uint8_t pfBit, uint8_t* data, uint8_t length) {
+ l2capoutbuf[0] = channel | direction | CR | extendAddress; // RFCOMM Address
+ l2capoutbuf[1] = channelType | pfBit; // RFCOMM Control
+ l2capoutbuf[2] = length << 1 | 0x01; // Length and format (always 0x01 bytes format)
+ uint8_t i = 0;
+ for(; i < length; i++)
+ l2capoutbuf[i + 3] = data[i];
+ l2capoutbuf[i + 3] = calcFcs(l2capoutbuf);
+#ifdef EXTRADEBUG
+ Notify(PSTR(" - RFCOMM Data: "), 0x80);
+ for(i = 0; i < length + 4; i++) {
+ D_PrintHex<uint8_t > (l2capoutbuf[i], 0x80);
+ Notify(PSTR(" "), 0x80);
+ }
+#endif
+ RFCOMM_Command(l2capoutbuf, length + 4);
+}
+
+void SPP::sendRfcommCredit(uint8_t channel, uint8_t direction, uint8_t CR, uint8_t channelType, uint8_t pfBit, uint8_t credit) {
+ l2capoutbuf[0] = channel | direction | CR | extendAddress; // RFCOMM Address
+ l2capoutbuf[1] = channelType | pfBit; // RFCOMM Control
+ l2capoutbuf[2] = 0x01; // Length = 0
+ l2capoutbuf[3] = credit; // Credit
+ l2capoutbuf[4] = calcFcs(l2capoutbuf);
+#ifdef EXTRADEBUG
+ Notify(PSTR(" - RFCOMM Credit Data: "), 0x80);
+ for(uint8_t i = 0; i < 5; i++) {
+ D_PrintHex<uint8_t > (l2capoutbuf[i], 0x80);
+ Notify(PSTR(" "), 0x80);
+ }
+#endif
+ RFCOMM_Command(l2capoutbuf, 5);
+}
+
+/* CRC on 2 bytes */
+uint8_t SPP::crc(uint8_t *data) {
+ return (pgm_read_byte(&rfcomm_crc_table[pgm_read_byte(&rfcomm_crc_table[0xFF ^ data[0]]) ^ data[1]]));
+}
+
+/* Calculate FCS */
+uint8_t SPP::calcFcs(uint8_t *data) {
+ uint8_t temp = crc(data);
+ if((data[1] & 0xEF) == RFCOMM_UIH)
+ return (0xFF - temp); // FCS on 2 bytes
+ else
+ return (0xFF - pgm_read_byte(&rfcomm_crc_table[temp ^ data[2]])); // FCS on 3 bytes
+}
+
+/* Check FCS */
+bool SPP::checkFcs(uint8_t *data, uint8_t fcs) {
+ uint8_t temp = crc(data);
+ if((data[1] & 0xEF) != RFCOMM_UIH)
+ temp = pgm_read_byte(&rfcomm_crc_table[temp ^ data[2]]); // FCS on 3 bytes
+ return (pgm_read_byte(&rfcomm_crc_table[temp ^ fcs]) == 0xCF);
+}
+
+/* Serial commands */
+#if defined(ARDUINO) && ARDUINO >=100
+
+size_t SPP::write(uint8_t data) {
+ return write(&data, 1);
+}
+#else
+
+void SPP::write(uint8_t data) {
+ write(&data, 1);
+}
+#endif
+
+#if defined(ARDUINO) && ARDUINO >=100
+
+size_t SPP::write(const uint8_t *data, size_t size) {
+#else
+
+void SPP::write(const uint8_t *data, size_t size) {
+#endif
+ for(uint8_t i = 0; i < size; i++) {
+ if(sppIndex >= sizeof (sppOutputBuffer) / sizeof (sppOutputBuffer[0]))
+ send(); // Send the current data in the buffer
+ sppOutputBuffer[sppIndex++] = data[i]; // All the bytes are put into a buffer and then send using the send() function
+ }
+#if defined(ARDUINO) && ARDUINO >=100
+ return size;
+#endif
+}
+
+void SPP::send() {
+ if(!connected || !sppIndex)
+ return;
+ uint8_t length; // This is the length of the string we are sending
+ uint8_t offset = 0; // This is used to keep track of where we are in the string
+
+ l2capoutbuf[0] = rfcommChannelConnection | 0 | 0 | extendAddress; // RFCOMM Address
+ l2capoutbuf[1] = RFCOMM_UIH; // RFCOMM Control
+
+ while(sppIndex) { // We will run this while loop until this variable is 0
+ if(sppIndex > (sizeof (l2capoutbuf) - 4)) // Check if the string is larger than the outgoing buffer
+ length = sizeof (l2capoutbuf) - 4;
+ else
+ length = sppIndex;
+
+ l2capoutbuf[2] = length << 1 | 1; // Length
+ uint8_t i = 0;
+ for(; i < length; i++)
+ l2capoutbuf[i + 3] = sppOutputBuffer[i + offset];
+ l2capoutbuf[i + 3] = calcFcs(l2capoutbuf); // Calculate checksum
+
+ RFCOMM_Command(l2capoutbuf, length + 4);
+
+ sppIndex -= length;
+ offset += length; // Increment the offset
+ }
+}
+
+int SPP::available(void) {
+ return rfcommAvailable;
+};
+
+void SPP::discard(void) {
+ rfcommAvailable = 0;
+}
+
+int SPP::peek(void) {
+ if(rfcommAvailable == 0) // Don't read if there is nothing in the buffer
+ return -1;
+ return rfcommDataBuffer[0];
+}
+
+int SPP::read(void) {
+ if(rfcommAvailable == 0) // Don't read if there is nothing in the buffer
+ return -1;
+ uint8_t output = rfcommDataBuffer[0];
+ for(uint8_t i = 1; i < rfcommAvailable; i++)
+ rfcommDataBuffer[i - 1] = rfcommDataBuffer[i]; // Shift the buffer one left
+ rfcommAvailable--;
+ bytesRead++;
+ if(bytesRead > (sizeof (rfcommDataBuffer) - 5)) { // We will send the command just before it runs out of credit
+ bytesRead = 0;
+ sendRfcommCredit(rfcommChannelConnection, rfcommDirection, 0, RFCOMM_UIH, 0x10, sizeof (rfcommDataBuffer)); // Send more credit
+#ifdef EXTRADEBUG
+ Notify(PSTR("\r\nSent "), 0x80);
+ Notify((uint8_t)sizeof (rfcommDataBuffer), 0x80);
+ Notify(PSTR(" more credit"), 0x80);
+#endif
+ }
+ return output;
+}