Nobuaki Aoki
local fix version of myBlueUSB (http://mbed.org/users/networker/code/myBlueUSB/). - merge deleted files which are required to compile. - enable echo back of received data via RFCOMM.
Dependencies: AvailableMemory FatFileSystem mbed myUSBHost
Diff: rfcomm/RFCOMM.cpp
- Revision:
- 0:003889bc474f
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/rfcomm/RFCOMM.cpp Sat Dec 07 14:19:00 2013 +0000
@@ -0,0 +1,682 @@
+#include "mbed.h"
+#include "Utils.h"
+#include "RFCOMM.h"
+
+// Control field values bit no. 1 2 3 4 5 6 7 8
+#define BT_RFCOMM_SABM 0x3F // 1 1 1 1 P/F 1 0 0
+#define BT_RFCOMM_UA 0x73 // 1 1 0 0 P/F 1 1 0
+#define BT_RFCOMM_DM 0x0F // 1 1 1 1 P/F 0 0 0
+#define BT_RFCOMM_DM_PF 0x1F
+#define BT_RFCOMM_DISC 0x53 // 1 1 0 0 P/F 0 1 0
+#define BT_RFCOMM_UIH 0xEF // 1 1 1 1 P/F 1 1 1
+#define BT_RFCOMM_UIH_PF 0xFF
+
+// Multiplexer message types
+#define BT_RFCOMM_PN_CMD 0x83
+#define BT_RFCOMM_PN_RSP 0x81
+#define BT_RFCOMM_TEST_CMD 0x23
+#define BT_RFCOMM_TEST_RSP 0x21
+#define BT_RFCOMM_FCON_CMD 0xA3
+#define BT_RFCOMM_FCON_RSP 0xA1
+#define BT_RFCOMM_FCOFF_CMD 0x63
+#define BT_RFCOMM_FCOFF_RSP 0x61
+#define BT_RFCOMM_MSC_CMD 0xE3
+#define BT_RFCOMM_MSC_RSP 0xE1
+#define BT_RFCOMM_RPN_CMD 0x93
+#define BT_RFCOMM_RPN_RSP 0x91
+#define BT_RFCOMM_RLS_CMD 0x53
+#define BT_RFCOMM_RLS_RSP 0x51
+#define BT_RFCOMM_NSC_RSP 0x11
+
+// FCS calc
+#define BT_RFCOMM_CODE_WORD 0xE0 // pol = x8+x2+x1+1
+#define BT_RFCOMM_CRC_CHECK_LEN 3
+#define BT_RFCOMM_UIHCRC_CHECK_LEN 2
+
+#define NR_CREDITS 1
+#define INITIAL_CREDITS 1 //0...7
+
+#define DCD (1<<7) //DV data carrier detect
+#define RI (1<<6) //IC ring indicator
+#define RTS (1<<3) //RTR request to send
+#define DSR (1<<2) //RTC data set ready
+#define FC (1<<1) //Flow Control
+#define EA (1<<0) //extended address (always 1)
+#define SIGNALS (DCD | RTS | DSR | EA)
+
+#define DEBUG 1
+#define TAKE_INITIATIVE
+
+RFCOMMManager rfcomm_manager;
+
+//uint8_t rfcomm_out_buffer[1000];//seems a bit big as default max framesize is 127
+//unsigned rfcomm::maxframesize = MAX_FRAME_SIZE; //only initial value
+
+//these functions are obtained from rfcomm.c on google code
+void _bt_rfcomm_send_sabm(unsigned short source_cid, unsigned char initiator, unsigned char channel);
+void _bt_rfcomm_send_uih_pn_command(unsigned short source_cid, unsigned char initiator, unsigned char channel, unsigned short max_frame_size);
+void _bt_rfcomm_send_uih_msc_cmd(unsigned short source_cid, unsigned char initiator, unsigned char channel, unsigned char signals);
+void _bt_rfcomm_send_uih_rpn_cmd(uint16_t source_cid, uint8_t initiator, uint8_t dlci, port_settings *val);
+int rfcomm_send_packet(unsigned short source_cid, unsigned char address, unsigned char control, unsigned char credits, const unsigned char *data, unsigned short len);
+uint8_t crc8_calc(uint8_t *data, uint16_t len);
+
+
+//find a free socket slot for channel ch
+int rfcomm::find_slot(unsigned ch) {
+ for (int i = 0; i < MAX_RFCOMM_SCKTS; i++) {
+ if (sckts[i] != 0) { //socket is in use
+ RFCOMMSocket *s = (RFCOMMSocket*)GetSocketInternal(sckts[i]);
+ if (s==0) {
+ printf("find_slot: socket %d not found\n", sckts[i]);
+ continue;
+ }
+ if (s->dlci >> 1 == ch) {
+ printf("Channel %d is already in use on socket %d\n", ch, sckts[i]);
+ return -1;
+ }
+ } else //slot is free
+ return i;
+ }
+ return -2; //no free slots
+}
+
+//find the rfcomm socket for dlci
+RFCOMMSocket* rfcomm::find_socket(unsigned dlci) {
+ for (int i = 0; i < MAX_RFCOMM_SCKTS; i++) {
+ if (sckts[i] != 0) { //socket is in use
+ RFCOMMSocket *s = (RFCOMMSocket*)GetSocketInternal(sckts[i]);
+ if (s==0) {
+ printf("find_socket: socket %d not found\n", sckts[i]);
+ continue;
+ }
+ if (s->dlci == dlci) {
+ return s;
+ }
+ }
+ }
+ printf("RFCOMMSocket for dlci %d was not found!\n", dlci);
+ return 0; //socket not found
+}
+
+//send a PN command to all sockets waiting to be opened
+void rfcomm::initChannels(int socket) {
+ for (int i = 0; i < MAX_RFCOMM_SCKTS; i++) {
+ if (sckts[i] != 0) { //socket is in use
+ RFCOMMSocket *s = (RFCOMMSocket*)GetSocketInternal(sckts[i]);
+ if (s==0) {
+ printf("initChannels: socket %d not found\n", sckts[i]);
+ continue;
+ }
+ if (s->State == SocketState_Opening) {
+ printf("Sending PN for DLCI %d on socket %d\n", s->dlci, sckts[i]);
+ _bt_rfcomm_send_uih_pn_command(socket, 1, s->dlci, maxframesize);
+ s->State = SocketState_L2CAP_Config_wait;
+ }
+ }
+ }
+}
+
+unsigned rfcomm::release_channel(unsigned dlci) {
+ int n = 0;
+ for (int i = 0; i < MAX_RFCOMM_SCKTS; i++) {
+ if (sckts[i] != 0) { //socket is in use
+ RFCOMMSocket *s = (RFCOMMSocket*)GetSocketInternal(sckts[i]);
+ if (s==0) {
+ printf("Release: socket for dlci %d not found\n", dlci);
+ continue;
+ }
+ if (s->dlci == dlci)
+ sckts[i] = 0;
+ else
+ n++;
+ }
+ }
+ return n;
+}
+
+int rfcomm::Send(SocketInternal *sock, const u8* data, int len) {//also see if credits need to be send
+ RFCOMMSocket *s = (RFCOMMSocket*)sock;
+ char credits = 0;
+ char control = BT_RFCOMM_UIH;
+ if (len + 14 > maxframesize) //hci/l2cap header =8, rfcomm header ~ 6
+ printf("Error! packetsize = %d, maxframesize = %d\n", len, maxframesize);
+ if (s->peer_credits == 0) {//peer is low on credits
+ credits = NR_CREDITS;
+ control = BT_RFCOMM_UIH_PF;
+ s->peer_credits += NR_CREDITS;//so provide some more
+ }
+ unsigned char address = (1 << 0) | (initiator << 1) | (s->dlci << 2);
+ if (s->my_credits) {
+ s->my_credits--;
+ return rfcomm_send_packet(_l2cap, address, control, credits, data, len);
+ } else
+ return rfcomm_send_packet(_l2cap, address, control, credits, data, 0);//send an empty packet when credits run out
+}
+
+int rfcomm::Close(SocketInternal* sock) {
+ RFCOMMSocket *s = (RFCOMMSocket*)sock;
+ int id = s->dlci;
+ printf("Closing rfcomm dlci %d state=%d\n", id, s->State);
+ Disconnect(s);
+ int n = release_channel(id);
+ printf("%d channels are still open\n", n);
+ if (n == 0) {//all rfcomm channels are closed
+ printf("....L2CAP must be closed as well\n");
+ rfcomm_send_packet(_l2cap, (1 << 0) | (initiator << 1), BT_RFCOMM_DISC, 0, 0, 0); //close dlci0
+ Socket_Close(_l2cap);
+ _l2cap = 0; //return rfcomm to the pool
+ }
+ return 0;
+}
+
+int rfcomm::SetOpt(SocketInternal *sock, int so, int* data, int len) {
+ switch (so) {
+ case SO_RECBUF:
+ case SO_SNDBUF:
+ maxframesize = *data; //pointless because setting takes effect only before socket is opened (before PN)
+ break;
+ default: return NOPROTOOPT;
+ }
+ return 0;
+}
+
+int rfcomm::GetOpt(SocketInternal *sock, int so, int* data, int len) {
+ switch (so) {
+ case SO_RECBUF:
+ case SO_SNDBUF:
+ if (len >= sizeof(int))
+ *data = maxframesize;
+ break;
+ default: return NOPROTOOPT;
+ }
+ return 0;
+}
+
+int rfcomm::Disconnect(RFCOMMSocket *s) {
+ unsigned char address = (1 << 0) | (initiator << 1) | (s->dlci << 2);
+ return rfcomm_send_packet(_l2cap, address, BT_RFCOMM_DISC, 0, 0, 0);
+}
+
+//expect this to be called with socket type=SOCKET_RFCOM and addr->psm = channel and addr->bdaddr is the BT addr
+//of the device to connect to.
+//eg. Socket_Open(SOCKET_RFCOM, rfcommaddr(bdaddr, chan), receiver_func, appl_obj);
+int rfcomm::Open(SocketInternal* sock, SocketAddrHdr* addr) {
+ int ch = ((L2CAPAddr*)addr)->psm;//abused psm for channel ID
+ RFCOMMSocket *s = (RFCOMMSocket*)sock;
+ int slot = find_slot(ch);
+ if (slot < 0) return 0;
+ sckts[slot] = s->ID;
+ s->serdevice = this;
+ s->State = SocketState_Opening;
+
+ if (_l2cap == 0) { //no rfcomm -> l2cap connection yet
+ printf("Need to open L2CAP channel first before opening RFCOMM channel %d\n", s->dlci);
+ ((L2CAPAddr*)addr)->psm = L2CAP_PSM_RFCOMM;//open the l2cap channel and the rfcomm_ch channel
+ initiator = 1;
+ s->dlci = (ch<<1)|!initiator;
+ _l2cap = Socket_Open(SOCKET_L2CAP, addr, OnRfCommControl, this);//this is the socket between the RFCOMM and the L2CAP layer
+ if (_l2cap)
+ printf("Successfully opened L2CAP channel on socket %d\n", _l2cap);
+ else {
+ printf("Opening L2CAP channel failed\n");
+ sckts[slot] = 0;
+ s->State = SocketState_Closed;
+ return 0;
+ }
+ } else {//bypass the l2cap channel creation
+ s->dlci = (ch<<1)|!initiator;
+ _bt_rfcomm_send_uih_pn_command(_l2cap, initiator, s->dlci, maxframesize);
+ s->State = SocketState_L2CAP_Config_wait;
+ }
+ return s->ID; //return the application unique socket nr.
+}
+
+int rfcomm::set_remote_port_parameters(unsigned char dlci, port_settings *p) {
+ _bt_rfcomm_send_uih_rpn_cmd(_l2cap, initiator, dlci, p);
+ return 0;
+}
+
+//socket is an L2CAP socket and state is the state of the L2CAP socket, not the RFCOMM socket
+void rfcomm::OnRfCommControl(int socket, SocketState state, const u8* data, int len, void* userData) {
+ int packet_processed = 0;
+ rfcomm* self = (rfcomm*)userData;
+ const u8 initiator = self->initiator;
+ printf("\x1B[%dm", 32); //debug: set a different colour
+ printf("OnRfCommControl sock = %d, state = %d, length = %d\n", socket, state, len);
+
+ if (len == 0) {//client only
+ if (state==SocketState_Open) {//callback after change to 'open', the rfcomm->l2cap channel is now open
+ _bt_rfcomm_send_sabm(socket, initiator, 0); //setup the rfcomm control channel dlci==0
+ return;
+ }
+ return; //or other states to handle, e.g. Closing or Closed
+ }
+ //we have data, so parse the header
+ const u8 &addr = data[0];
+ u8 dlci = addr>>2;
+ const u8 &control = data[1];
+ u16 length = data[2]>>1;
+ const u8 *payload = data+3;
+ const u8 *pFCS = data+len-1; //expected position of the CRC
+ if (!(data[2]&1)) { //two byte length
+ length += ((unsigned)data[3])<<7;
+ payload++;
+ }
+ u8 credits = 0;
+ if (control == BT_RFCOMM_UIH_PF)//this packet carries credits
+ credits = *(payload++);
+ //sanity check
+ if (payload+length != pFCS)
+ printf("RFCOMM size mismatch, expected %d payload bytes, got %d\n", length, pFCS-payload);
+
+ if (DEBUG) {
+ printf("RFCOMM: EA=%d, C/R=%d, D=%d, ch=%d; control=%02X (P/F=%d); length=%d\n", addr&1, (addr>>1)&1, (addr>>2)&1, (addr>>3), control, (control>>4)&1, length);
+ printfBytes("payload:", payload, length);
+ }
+ if (dlci == 0) { //dlci==0 control channel
+ L2CAPSocket *s = (L2CAPSocket*)GetSocketInternal(socket);
+ switch (control) {
+ case BT_RFCOMM_UA:// received 1. message BT_RF_COMM_UA
+ packet_processed++;
+ if (s->si.State == SocketState_Closing || s->si.State==SocketState_L2CAP_WaitDisconnect) { //Confirmation of disconnect
+ printf("Remote side confirmed disconnect for socket %d\n", s->si.ID);
+ s->si.SetState(SocketState_Closed);
+ break;
+ }
+ printf("Received RFCOMM unnumbered acknowledgement for channel 0 - multiplexer working\n");
+ printf("Sending UIH Parameter Negotiation Command from OnRfCommControl\n");
+ self->initChannels(socket);
+ break;
+ case BT_RFCOMM_UIH:// received UIH Parameter Negotiation Response
+ switch (payload[0]) {
+ case BT_RFCOMM_PN_RSP: {//client
+ packet_processed++;
+ printf("UIH Parameter Negotiation Response\n");
+ printf("Sending SABM #%u\n", payload[2]);
+ _bt_rfcomm_send_sabm(socket, initiator, payload[2]);//was rfcomm_ch
+ RFCOMMSocket *r = self->find_socket(payload[2]);
+ if (r==0) break;
+ r->my_credits = payload[9]; //initial amount of credits
+ self->maxframesize = min(self->maxframesize, payload[6] + (payload[7]<<8));
+ printf("Max Frame Size = %d, got %d initial credits\n", self->maxframesize, payload[9]);
+ }
+ break;
+ case BT_RFCOMM_PN_CMD: { //remote side sent PN command, mtu and initial credits
+ packet_processed++;
+ printf("UIH Parameter Negotiation Indication\n");
+ self->maxframesize = min(self->maxframesize, payload[6] + (payload[7]<<8));
+ unsigned char cred = payload[9] & 7;
+ unsigned char _dlci = payload[2];
+
+ int skt = rfcomm_manager.find_socket(_dlci>>1);
+ if (skt == 0) { //No-one is listening
+ printf("No-one is Listening on channel %d\n", _dlci>>1);
+ rfcomm_send_packet(socket, (_dlci<<2)|1, BT_RFCOMM_DM, 0, 0, 0);
+ break;
+ }
+ RFCOMMSocket *r = (RFCOMMSocket*)GetSocketInternal(skt);
+ r->my_credits = cred;
+ r->peer_credits = INITIAL_CREDITS;
+ unsigned char reply[10];
+ memcpy(reply, payload, sizeof(reply));
+ reply[0] = BT_RFCOMM_PN_RSP;//[1]=len, [2]=dlci, [4]=priority, [5]=timer(must be 0), [8] retransmissions (must be 0)
+ reply[3] = payload[3]==0xF0 ? 0xE0 : 0; //support credit based flow control
+ reply[6] = self->maxframesize;
+ reply[7] = self->maxframesize>>8;
+ reply[9] = payload[3]==0xF0 ? r->peer_credits : 0;
+ printf("Max Frame Size = %d, give %d initial credits\n", self->maxframesize, reply[9]);
+ rfcomm_send_packet(socket, addr^2, BT_RFCOMM_UIH, 0, reply, sizeof(reply));
+ }
+ break;
+ case BT_RFCOMM_MSC_CMD:
+ packet_processed++;
+ {
+ printf("Received BT_RFCOMM_MSC_IND\n");
+ // fine with this, return the same status and ignore the value, there is no room in the socket to store the value, rfcomm could generate an event
+ RFCOMMSocket *r = self->find_socket(payload[2]>>2);
+ if (r==0) break;
+ unsigned char reply[5];
+ memcpy(reply, payload, 5); //keep length, dlci and value(s)
+ reply[0] = BT_RFCOMM_MSC_RSP; // change command into response
+ printf("Sending MSC_RSP (%d bytes)\n", length);
+ rfcomm_send_packet(socket, addr^2, BT_RFCOMM_UIH, 0, reply, (payload[1]>>1)+2); // reply is 4 or 5 bytes
+ switch (r->State) {
+ case SocketState_L2CAP_Config_wait:
+ r->State = SocketState_L2CAP_Config_wait_send;
+ printf("Sending MSC_CMD\n");
+ _bt_rfcomm_send_uih_msc_cmd(socket, initiator, payload[2]>>2, SIGNALS); // ea=1,fc=0,rtc(DSR/DTR)=1,rtr(RTS/CTs)=1,ic(RI)=0,dv(DCD)=1
+ r->State = SocketState_L2CAP_Config_wait_rsp;
+ break;
+ case SocketState_L2CAP_Config_wait_reqrsp:
+ r->State = SocketState_L2CAP_Config_wait_rsp;
+ break;
+ case SocketState_L2CAP_Config_wait_req:
+ r->SetState(SocketState_Open);
+ break;
+ case SocketState_Open:
+ //inform port adaptation layer
+ printf("Received MSC IND in state Open for dlci 0x%02x\n", payload[2]>>2);
+ break;
+ default:
+ printf("Received MSC IND in state %d for dlci 0x%02x\n", r->State, payload[2]>>2);
+ }
+ }
+ break;
+ case BT_RFCOMM_MSC_RSP:
+ packet_processed++;
+ {
+ RFCOMMSocket *r = self->find_socket(payload[2]>>2);
+ if (r==0) break;
+ if (r->State == SocketState_L2CAP_Config_wait_reqrsp)
+ r->State = SocketState_L2CAP_Config_wait_req;
+ else if (r->State == SocketState_L2CAP_Config_wait_rsp)
+ r->SetState(SocketState_Open);
+ else
+ printf("Received MSC confirmation in state %d for dlci 0x%02x\n", r->State, payload[2]>>2);
+ }
+ break;
+ case BT_RFCOMM_RPN_CMD:
+ packet_processed++;
+ //accept and ignore all settings
+ unsigned char reply[10];
+ memcpy(reply, payload, length); //keep length, dlci and value(s)
+ reply[0] = BT_RFCOMM_RPN_RSP; // change command into response
+ printf("Responding to RPN indication (%d bytes)\n", length);
+ rfcomm_send_packet(socket, addr^2, BT_RFCOMM_UIH, 0, reply, length);
+ break;
+ case BT_RFCOMM_RPN_RSP:
+ packet_processed++;
+ //ignore a response
+ printf("Received RPN confirmation\n");
+ break;
+ default:
+ printf("Unsupported multiplexer frame, type=%02XH\n", data[3]);
+ }
+ break;
+ case BT_RFCOMM_DISC:
+ printf("Remote site actively disconnected from DLCI0\n");
+ rfcomm_send_packet(socket, addr|2, BT_RFCOMM_UA, 0, 0, 0);//confirm disconnection
+ //intentional fall through
+ case BT_RFCOMM_DM:
+ packet_processed++;
+ printf("Remote side refused connection on DLCI0\n");
+ self->_l2cap = Socket_Close(socket);
+ break;
+ case BT_RFCOMM_SABM:
+ packet_processed++;
+ printf("Remote site is seeking connection on DLCI0\n"); //respond with UA
+ rfcomm_send_packet(socket, addr|2, BT_RFCOMM_UA, 0, 0, 0);//confirm connection
+ break;
+ default:
+ printf("Unexpected RFCOMM cmd %02XH for address %02XH, length=%d\n", control, addr, length);
+ }
+ } else { //data is for one of the serial sockets
+ RFCOMMSocket *s = 0;
+ if (control == BT_RFCOMM_SABM) { //req. for conn on this dlci
+ //cannot call self->rfcomm::find_socket because it has no socket yet
+ int skt = rfcomm_manager.find_socket(dlci>>1); //find the server socket
+ s = (RFCOMMSocket*)GetSocketInternal(skt);//the listening socket
+ if (s) {//move the listening socket to the appropriate rfcomm
+ int slot = self->find_slot(dlci>>1);
+ if (slot < 0) {
+ printf("RFCOMM Channel %d is not free on rfcomm with l2cap socket %d\n", dlci>>1, self->_l2cap);
+ return;
+ }
+ s->serdevice = self; //bind the socket to this refcomm entity
+ self->sckts[slot] = skt;
+ rfcomm_manager.remove_socket(skt);
+ } else {
+ printf("Couln't find a listening socket for dlci %d\n", dlci);
+ return;
+ }
+ } else
+ s = self->find_socket(dlci);
+ if (s==0){
+ printf("DLCI %d not found\n", dlci);
+ return;
+ }
+ switch (control) {
+ case BT_RFCOMM_SABM:
+ packet_processed++;
+ rfcomm_send_packet(socket, addr|2, BT_RFCOMM_UA, 0, 0, 0);//confirm connection
+ s->State = SocketState_L2CAP_Config_wait; //wait for msc cmd
+#ifdef TAKE_INITIATIVE
+ printf("Sending MSC_CMD\n");
+ _bt_rfcomm_send_uih_msc_cmd(socket, initiator, dlci, 0x8d); // ea=1,fc=0,rtc(DSR/DTR)=1,rtr(RTS/CTs)=1,ic(RI)=0,dv(DCD)=1
+ s->State = SocketState_L2CAP_Config_wait_reqrsp;
+#endif
+ break;
+ case BT_RFCOMM_UA:// received 2. message BT_RF_COMM_UA
+ packet_processed++;
+ if (s->State == SocketState_Closing) { //Confirmation of disconnect
+ printf("Remote side confirmed disconnect for socket %d\n", s->ID);
+ s->SetState(SocketState_Closed);
+ break;
+ }
+ printf("Received RFCOMM unnumbered acknowledgement for dlci %u - channel opened\n", dlci);
+ if (s->State == SocketState_L2CAP_Config_wait) {
+ printf("Sending MSC CMD\n");
+ _bt_rfcomm_send_uih_msc_cmd(socket, initiator, dlci, 0x8d); // ea=1,fc=0,rtc(DSR/DTR)=1,rtr(RTS/CTs)=1,ic(RI)=0,dv(DCD)=1
+ s->State = SocketState_L2CAP_Config_wait_reqrsp;
+ }
+ break;
+ case BT_RFCOMM_UIH_PF: //user data with credits
+ printf("Got %u credits\n", credits);
+ s->my_credits += credits;
+ //intentional fall-through
+ case BT_RFCOMM_UIH: //user data
+ packet_processed++;
+ if (DEBUG) {
+ printf("RX: address %02x, control %02x: ", addr, control);
+ printHex( payload, length);
+ }
+ if (length) {
+ s->peer_credits--;
+ s->Recv(payload, length);
+ } else
+ printf("Received empty packet\n");
+ if (length == 0 || s->peer_credits == 0) {//send credits when peer runs out
+ //char ini = !(dlci & 1);
+ unsigned char address = (1 << 0) | (initiator << 1) | (dlci << 2);
+ printf("send %d credits to dlci %d\n", NR_CREDITS, addr>>2);
+ rfcomm_send_packet(socket, address, BT_RFCOMM_UIH_PF, NR_CREDITS, NULL, 0);
+ s->peer_credits += NR_CREDITS;
+ }
+ break;
+ case BT_RFCOMM_DISC:
+ packet_processed++;
+ printf("Received DISC IND for dlci %d\n", dlci);
+ rfcomm_send_packet(socket, addr, BT_RFCOMM_UA, 0, 0, 0);//confirm disconnection
+ s->SetState(SocketState_Closed);
+ break;
+ case BT_RFCOMM_DM:
+ case BT_RFCOMM_DM_PF:
+ packet_processed++;
+ printf("Received DM IND (%02X) for dlci %d\n", control, dlci);
+ s->SetState(SocketState_Closed);
+ break;
+ default:
+ printf("Unexpected RFCOMM cmd %02XH for address %02XH, length=%d\n", control, addr, length);
+ }
+ }
+
+ if (!packet_processed) {
+ // just dump data for now
+ printf("??: address %02x, control %02x: ", data[0], data[1]);
+ printHex( data, len );
+ }
+ printf("\x1B[%dm", 0);//reset terminal colour
+}
+
+//should make the functions below member functions
+
+/**
+ * @param credits - only used for RFCOMM flow control in UIH wiht P/F = 1
+ */
+/* Questionable optimisation. When OFFSET==8 a buffer is (dynamically) allocated that provides space for the lower
+ layer headers, this reduces copying to, and allocation of, a lower layer buffer. However, all other layers using
+ HCI/L2CAP must do the same.
+*/
+#define OFFSET 8
+
+int rfcomm_send_packet(uint16_t source_cid, uint8_t address, uint8_t control, uint8_t credits, const uint8_t *data, uint16_t len) {
+
+ uint16_t pos = OFFSET;
+ uint8_t crc_fields = 3;
+
+#if OFFSET == 8
+ uint8_t* rfcomm_out_buffer = new uint8_t[OFFSET+len+6];
+#else
+ static uint8_t rfcomm_out_buffer[MAXFRAMESIZE+6];//seems a bit big as default max framesize is 127
+#endif
+ rfcomm_out_buffer[pos++] = address;
+ rfcomm_out_buffer[pos++] = control;
+
+ // length field can be 1 or 2 octets
+ if (len < 128) {
+ rfcomm_out_buffer[pos++] = (len << 1)| 1; // bits 0-6
+ } else {
+ rfcomm_out_buffer[pos++] = (len & 0x7f) << 1; // bits 0-6
+ rfcomm_out_buffer[pos++] = len >> 7; // bits 7-14
+ crc_fields++;
+ }
+
+ // add credits for UIH frames when PF bit is set
+ if (control == BT_RFCOMM_UIH_PF) {
+ rfcomm_out_buffer[pos++] = credits;
+ }
+
+ // copy actual data
+ memcpy(&rfcomm_out_buffer[pos], data, len);
+ pos += len;
+
+ // UIH frames only calc FCS over address + control (5.1.1)
+ if ((control & 0xef) == BT_RFCOMM_UIH) {
+ crc_fields = 2;
+ }
+ rfcomm_out_buffer[pos++] = crc8_calc(rfcomm_out_buffer+OFFSET, crc_fields); // calc fcs
+ int retval = Socket_Send( source_cid, rfcomm_out_buffer, pos);
+#if OFFSET == 8
+ delete[] rfcomm_out_buffer;
+#endif
+ if (retval <= 0)
+ return retval;
+ return len;//return the size of the payload
+}
+
+void _bt_rfcomm_send_sabm(uint16_t source_cid, uint8_t initiator, uint8_t dlci) {
+ uint8_t address = (1 << 0) | (initiator << 1) | (dlci << 2);
+ rfcomm_send_packet(source_cid, address, BT_RFCOMM_SABM, 0, NULL, 0);
+}
+
+void _bt_rfcomm_send_uih_pn_command(uint16_t source_cid, uint8_t initiator, uint8_t dlci, uint16_t max_frame_size) {
+ uint8_t payload[10];
+ uint8_t address = (1 << 0) | (initiator << 1); // EA and C/R bit set - always server channel 0
+ uint8_t pos = 0;
+ payload[pos++] = BT_RFCOMM_PN_CMD;
+ payload[pos++] = 8 << 1 | 1; // len
+ payload[pos++] = dlci;
+ payload[pos++] = 0xf0; // pre defined for Bluetooth, see 5.5.3 of TS 07.10 Adaption for RFCOMM
+ payload[pos++] = 0; // priority
+ payload[pos++] = 0; // max 60 seconds ack
+ payload[pos++] = max_frame_size & 0xff; // max framesize low
+ payload[pos++] = max_frame_size >> 8; // max framesize high
+ payload[pos++] = 0x00; // number of retransmissions
+ payload[pos++] = INITIAL_CREDITS; // unused error recovery window
+ rfcomm_send_packet(source_cid, address, BT_RFCOMM_UIH, 0, (uint8_t *) payload, pos);
+}
+
+void _bt_rfcomm_send_uih_data(uint16_t source_cid, uint8_t initiator, uint8_t channel, uint8_t *data, uint16_t len) {
+ uint8_t address = (1 << 0) | (initiator << 1) | (!initiator << 2) | (channel << 3);
+ rfcomm_send_packet(source_cid, address, BT_RFCOMM_UIH, 0, data, len);
+}
+
+void _bt_rfcomm_send_uih_msc_cmd(uint16_t source_cid, uint8_t initiator, uint8_t dlci, uint8_t signals) {
+ uint8_t address = (1 << 0) | (initiator << 1); // EA and C/R bit set - always server channel 0
+ uint8_t payload[5];
+ uint8_t pos = 0;
+ payload[pos++] = BT_RFCOMM_MSC_CMD;
+ payload[pos++] = 2 << 1 | 1; // len, should be adapted when adding break byte
+ payload[pos++] = (1 << 0) | (1 << 1) | (dlci << 2); //C/R is always 1
+ payload[pos++] = signals;
+ // payload[pos++] = brk;
+ rfcomm_send_packet(source_cid, address, BT_RFCOMM_UIH, 0, (uint8_t *) payload, pos);
+}
+
+void _bt_rfcomm_send_uih_rpn_cmd(uint16_t source_cid, uint8_t initiator, uint8_t dlci, port_settings *val) {
+ uint8_t address = (1 << 0) | (initiator << 1); // EA and C/R bit set - always server channel 0
+ uint8_t payload[sizeof(port_settings)+3];
+ uint8_t pos = 0;
+ payload[pos++] = BT_RFCOMM_RPN_CMD;//type
+ if (val) {
+ payload[pos++] = ((1+sizeof(port_settings)) << 1) | 1; // len
+ payload[pos++] = (1 << 0) | (1 << 1) | (dlci << 2);
+ memcpy(payload+pos, (char*)val, sizeof(port_settings));
+ pos += sizeof(port_settings);
+ } else {
+ payload[pos++] = (1 << 1) | 1; // len
+ payload[pos++] = (1 << 0) | (1 << 1) | (dlci << 2);
+ }
+ rfcomm_send_packet(source_cid, address, BT_RFCOMM_UIH, 0, (uint8_t *) payload, pos);
+}
+
+int set_remote_port_parameters(int socket, port_settings *p) {
+ RFCOMMSocket* si = (RFCOMMSocket*)GetSocketInternal(socket);//gets the RFCOMM socket
+ if (!si || si->ID != socket)
+ return ERR_SOCKET_NOT_FOUND;
+ return si->serdevice->set_remote_port_parameters(si->dlci, p);
+}
+
+
+/*
+ * CRC (reversed crc) lookup table as calculated by the table generator in ETSI TS 101 369 V6.3.0.
+ */
+static const uint8_t crc8table[256] = { /* 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
+};
+
+#define CRC8_INIT 0xFF // Initial FCS value
+#define CRC8_OK 0xCF // Good final FCS value
+/*-----------------------------------------------------------------------------------*/
+uint8_t crc8(uint8_t *data, uint16_t len) {
+ uint16_t count;
+ uint8_t crc = CRC8_INIT;
+ for (count = 0; count < len; count++)
+ crc = crc8table[crc ^ data[count]];
+ return crc;
+}
+
+/*-----------------------------------------------------------------------------------*/
+uint8_t crc8_check(uint8_t *data, uint16_t len, uint8_t check_sum) {
+ uint8_t crc;
+
+ crc = crc8(data, len);
+
+ crc = crc8table[crc ^ check_sum];
+ if (crc == CRC8_OK)
+ return 0; /* Valid */
+ else
+ return 1; /* Failed */
+
+}
+
+/*-----------------------------------------------------------------------------------*/
+uint8_t crc8_calc(uint8_t *data, uint16_t len) {
+ /* Ones complement */
+ return 0xFF - crc8(data, len);
+}