1 | /*
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2 | * Copyright (C) 2009-2012 by Matthias Ringwald
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3 | *
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4 | * Redistribution and use in source and binary forms, with or without
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5 | * modification, are permitted provided that the following conditions
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6 | * are met:
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7 | *
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8 | * 1. Redistributions of source code must retain the above copyright
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9 | * notice, this list of conditions and the following disclaimer.
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10 | * 2. Redistributions in binary form must reproduce the above copyright
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11 | * notice, this list of conditions and the following disclaimer in the
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12 | * documentation and/or other materials provided with the distribution.
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13 | * 3. Neither the name of the copyright holders nor the names of
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14 | * contributors may be used to endorse or promote products derived
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15 | * from this software without specific prior written permission.
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16 | * 4. Any redistribution, use, or modification is done solely for
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17 | * personal benefit and not for any commercial purpose or for
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18 | * monetary gain.
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19 | *
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20 | * THIS SOFTWARE IS PROVIDED BY MATTHIAS RINGWALD AND CONTRIBUTORS
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21 | * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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22 | * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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23 | * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL MATTHIAS
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24 | * RINGWALD OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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25 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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26 | * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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27 | * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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28 | * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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29 | * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
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30 | * THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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31 | * SUCH DAMAGE.
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32 | *
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33 | * Please inquire about commercial licensing options at btstack@ringwald.ch
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34 | *
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35 | */
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36 |
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37 | /*
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38 | * RFCOMM.h
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39 | */
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40 |
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41 | #ifndef __RFCOMM_H
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42 | #define __RFCOMM_H
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43 |
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44 | #include <btstack/btstack.h>
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45 | #include <btstack/utils.h>
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46 |
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47 | #include <stdint.h>
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48 |
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49 | #if defined __cplusplus
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50 | extern "C" {
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51 | #endif
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52 |
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53 | #define UNLIMITED_INCOMING_CREDITS 0xff
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54 |
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55 | #define RFCOMM_TEST_DATA_MAX_LEN 4
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56 |
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57 | #define RFCOMM_RLS_STATUS_INVALID 0xff
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58 |
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59 | // Line Status
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60 | #define LINE_STATUS_NO_ERROR 0x00
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61 | #define LINE_STATUS_OVERRUN_ERROR 0x03
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62 | #define LINE_STATUS_PARITY_ERORR 0x05
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63 | #define LINE_STATUS_FRAMING_ERROR 0x09
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64 |
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65 | // Modem Status Flags
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66 | #define MODEM_STATUS_FC 0x02
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67 | #define MODEM_STATUS_RTC 0x04
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68 | #define MODEM_STATUS_RTR 0x08
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69 | #define MODEM_STATUS_IC 0x40
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70 | #define MODEM_STATUS_DV 0x80
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71 |
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72 | typedef enum rpn_baud {
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73 | RPN_BAUD_2400 = 0,
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74 | RPN_BAUD_4800,
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75 | RPN_BAUD_7200,
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76 | RPN_BAUD_9600,
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77 | RPN_BAUD_19200,
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78 | RPN_BAUD_38400,
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79 | RPN_BAUD_57600,
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80 | RPN_BAUD_115200,
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81 | RPN_BAUD_230400
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82 | } rpn_baud_t;
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83 |
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84 | typedef enum rpn_data_bits {
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85 | RPN_DATA_BITS_5 = 0,
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86 | RPN_DATA_BITS_6 = 0,
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87 | RPN_DATA_BITS_7 = 0,
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88 | RPN_DATA_BITS_8 = 0
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89 | } rpn_data_bits_t;
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90 |
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91 | typedef enum rpn_stop_bits {
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92 | RPN_STOP_BITS_1_0 = 0,
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93 | RPN_STOP_BITS_1_5
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94 | } rpn_stop_bits_t;
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95 |
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96 | typedef enum rpn_parity {
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97 | RPN_PARITY_NONE = 0,
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98 | RPN_PARITY_ODD = 1,
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99 | RPN_PARITY_EVEN = 3,
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100 | RPN_PARITY_MARK = 5,
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101 | RPN_PARITY_SPACE = 7,
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102 | } rpn_parity_t;
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103 |
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104 | typedef enum rpn_flow_control {
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105 | RPN_FLOW_CONTROL_XONXOFF_ON_INPUT = 1 << 0,
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106 | RPN_FLOW_CONTROL_XONXOFF_ON_OUTPUT = 1 << 1,
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107 | RPN_FLOW_CONTROL_RTR_ON_INPUT = 1 << 2,
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108 | RPN_FLOW_CONTROL_RTR_ON_OUTPUT = 1 << 3,
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109 | RPN_FLOW_CONTROL_RTC_ON_INPUT = 1 << 4,
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110 | RPN_FLOW_CONTROL_RTC_ON_OUTPUT = 1 << 5,
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111 | } rpn_flow_control_t;
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112 |
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113 | #define RPN_PARAM_MASK_0_BAUD 0x01
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114 | #define RPN_PARAM_MASK_0_DATA_BITS 0x02
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115 | #define RPN_PARAM_MASK_0_STOP_BITS 0x04
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116 | #define RPN_PARAM_MASK_0_PARITY 0x08
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117 | #define RPN_PARAM_MASK_0_PARITY_TYPE 0x10
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118 | #define RPN_PARAM_MASK_0_XON_CHAR 0x20
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119 | #define RPN_PARAM_MASK_0_XOFF_CHAR 0x40
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120 | #define RPN_PARAM_MASK_0_RESERVED 0x80
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121 |
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122 | // @note: values are identical to rpn_flow_control_t
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123 | #define RPN_PARAM_MASK_1_XONOFF_ON_INPUT 0x01
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124 | #define RPN_PARAM_MASK_1_XONOFF_ON_OUTPUT 0x02
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125 | #define RPN_PARAM_MASK_1_RTR_ON_INPUT 0x04
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126 | #define RPN_PARAM_MASK_1_RTR_ON_OUTPUT 0x08
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127 | #define RPN_PARAM_MASK_1_RTC_ON_INPUT 0x10
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128 | #define RPN_PARAM_MASK_1_RTC_ON_OUTPUT 0x20
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129 | #define RPN_PARAM_MASK_1_RESERVED_0 0x40
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130 | #define RPN_PARAM_MASK_1_RESERVED_1 0x80
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131 |
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132 |
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133 | // private structs
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134 | typedef enum {
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135 | RFCOMM_MULTIPLEXER_CLOSED = 1,
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136 | RFCOMM_MULTIPLEXER_W4_CONNECT, // outgoing
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137 | RFCOMM_MULTIPLEXER_SEND_SABM_0, // "
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138 | RFCOMM_MULTIPLEXER_W4_UA_0, // "
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139 | RFCOMM_MULTIPLEXER_W4_SABM_0, // incoming
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140 | RFCOMM_MULTIPLEXER_SEND_UA_0,
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141 | RFCOMM_MULTIPLEXER_OPEN,
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142 | RFCOMM_MULTIPLEXER_SEND_UA_0_AND_DISC
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143 | } RFCOMM_MULTIPLEXER_STATE;
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144 |
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145 | typedef enum {
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146 | MULT_EV_READY_TO_SEND = 1,
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147 |
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148 | } RFCOMM_MULTIPLEXER_EVENT;
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149 |
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150 | typedef enum {
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151 | RFCOMM_CHANNEL_CLOSED = 1,
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152 | RFCOMM_CHANNEL_W4_MULTIPLEXER,
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153 | RFCOMM_CHANNEL_SEND_UIH_PN,
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154 | RFCOMM_CHANNEL_W4_PN_RSP,
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155 | RFCOMM_CHANNEL_SEND_SABM_W4_UA,
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156 | RFCOMM_CHANNEL_W4_UA,
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157 | RFCOMM_CHANNEL_INCOMING_SETUP,
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158 | RFCOMM_CHANNEL_DLC_SETUP,
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159 | RFCOMM_CHANNEL_OPEN,
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160 | RFCOMM_CHANNEL_SEND_UA_AFTER_DISC,
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161 | RFCOMM_CHANNEL_SEND_DISC,
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162 | RFCOMM_CHANNEL_W4_UA_AFTER_UA,
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163 | RFCOMM_CHANNEL_SEND_DM,
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164 |
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165 | } RFCOMM_CHANNEL_STATE;
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166 |
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167 | typedef enum {
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168 | RFCOMM_CHANNEL_STATE_VAR_NONE = 0,
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169 | RFCOMM_CHANNEL_STATE_VAR_CLIENT_ACCEPTED = 1 << 0,
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170 | RFCOMM_CHANNEL_STATE_VAR_RCVD_PN = 1 << 1,
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171 | RFCOMM_CHANNEL_STATE_VAR_RCVD_RPN = 1 << 2,
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172 | RFCOMM_CHANNEL_STATE_VAR_RCVD_SABM = 1 << 3,
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173 |
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174 | RFCOMM_CHANNEL_STATE_VAR_RCVD_MSC_CMD = 1 << 4,
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175 | RFCOMM_CHANNEL_STATE_VAR_RCVD_MSC_RSP = 1 << 5,
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176 | RFCOMM_CHANNEL_STATE_VAR_SEND_PN_RSP = 1 << 6,
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177 | RFCOMM_CHANNEL_STATE_VAR_SEND_RPN_INFO = 1 << 7,
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178 |
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179 | RFCOMM_CHANNEL_STATE_VAR_SEND_RPN_RSP = 1 << 8,
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180 | RFCOMM_CHANNEL_STATE_VAR_SEND_UA = 1 << 9,
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181 | RFCOMM_CHANNEL_STATE_VAR_SEND_MSC_CMD = 1 << 10,
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182 | RFCOMM_CHANNEL_STATE_VAR_SEND_MSC_RSP = 1 << 11,
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183 |
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184 | RFCOMM_CHANNEL_STATE_VAR_SEND_CREDITS = 1 << 12,
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185 | RFCOMM_CHANNEL_STATE_VAR_SENT_MSC_CMD = 1 << 13,
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186 | RFCOMM_CHANNEL_STATE_VAR_SENT_MSC_RSP = 1 << 14,
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187 | RFCOMM_CHANNEL_STATE_VAR_SENT_CREDITS = 1 << 15,
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188 | } RFCOMM_CHANNEL_STATE_VAR;
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189 |
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190 | typedef enum {
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191 | CH_EVT_RCVD_SABM = 1,
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192 | CH_EVT_RCVD_UA,
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193 | CH_EVT_RCVD_PN,
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194 | CH_EVT_RCVD_PN_RSP,
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195 | CH_EVT_RCVD_DISC,
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196 | CH_EVT_RCVD_DM,
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197 | CH_EVT_RCVD_MSC_CMD,
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198 | CH_EVT_RCVD_MSC_RSP,
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199 | CH_EVT_RCVD_NSC_RSP,
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200 | CH_EVT_RCVD_RLS_CMD,
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201 | CH_EVT_RCVD_RLS_RSP,
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202 | CH_EVT_RCVD_RPN_CMD,
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203 | CH_EVT_RCVD_RPN_REQ,
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204 | CH_EVT_RCVD_CREDITS,
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205 | CH_EVT_MULTIPLEXER_READY,
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206 | CH_EVT_READY_TO_SEND,
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207 | } RFCOMM_CHANNEL_EVENT;
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208 |
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209 | typedef struct rfcomm_channel_event {
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210 | RFCOMM_CHANNEL_EVENT type;
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211 | } rfcomm_channel_event_t;
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212 |
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213 | typedef struct rfcomm_channel_event_pn {
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214 | rfcomm_channel_event_t super;
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215 | uint16_t max_frame_size;
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216 | uint8_t priority;
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217 | uint8_t credits_outgoing;
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218 | } rfcomm_channel_event_pn_t;
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219 |
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220 | typedef struct rfcomm_rpn_data {
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221 | uint8_t baud_rate;
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222 | uint8_t flags;
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223 | uint8_t flow_control;
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224 | uint8_t xon;
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225 | uint8_t xoff;
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226 | uint8_t parameter_mask_0; // first byte
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227 | uint8_t parameter_mask_1; // second byte
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228 | } rfcomm_rpn_data_t;
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229 |
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230 | typedef struct rfcomm_channel_event_rpn {
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231 | rfcomm_channel_event_t super;
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232 | rfcomm_rpn_data_t data;
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233 | } rfcomm_channel_event_rpn_t;
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234 |
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235 | typedef struct rfcomm_channel_event_rls {
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236 | rfcomm_channel_event_t super;
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237 | uint8_t line_status;
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238 | } rfcomm_channel_event_rls_t;
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239 |
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240 | typedef struct rfcomm_channel_event_msc {
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241 | rfcomm_channel_event_t super;
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242 | uint8_t modem_status;
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243 | } rfcomm_channel_event_msc_t;
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244 |
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245 | // info regarding potential connections
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246 | typedef struct {
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247 | // linked list - assert: first field
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248 | linked_item_t item;
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249 |
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250 | // server channel
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251 | uint8_t server_channel;
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252 |
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253 | // incoming max frame size
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254 | uint16_t max_frame_size;
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255 |
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256 | // use incoming flow control
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257 | uint8_t incoming_flow_control;
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258 |
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259 | // initial incoming credits
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260 | uint8_t incoming_initial_credits;
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261 |
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262 | // client connection
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263 | void *connection;
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264 |
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265 | // internal connection
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266 | btstack_packet_handler_t packet_handler;
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267 |
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268 | } rfcomm_service_t;
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269 |
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270 | // info regarding multiplexer
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271 | // note: spec mandates single multplexer per device combination
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272 | typedef struct {
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273 | // linked list - assert: first field
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274 | linked_item_t item;
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275 |
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276 | timer_source_t timer;
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277 | int timer_active;
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278 |
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279 | RFCOMM_MULTIPLEXER_STATE state;
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280 |
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281 | uint16_t l2cap_cid;
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282 | uint8_t l2cap_credits;
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283 |
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284 | uint8_t fcon; // only send if fcon & 1, send rsp if fcon & 0x80
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285 |
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286 | bd_addr_t remote_addr;
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287 | hci_con_handle_t con_handle;
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288 |
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289 | uint8_t outgoing;
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290 |
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291 | // hack to deal with authentication failure only observed by remote side
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292 | uint8_t at_least_one_connection;
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293 |
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294 | uint16_t max_frame_size;
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295 |
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296 | // send DM for DLCI != 0
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297 | uint8_t send_dm_for_dlci;
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298 |
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299 | // non supportec command, 0 if not set
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300 | uint8_t nsc_command;
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301 |
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302 | // test data - limited to RFCOMM_TEST_DATA_MAX_LEN
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303 | uint8_t test_data_len;
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304 | uint8_t test_data[RFCOMM_TEST_DATA_MAX_LEN];
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305 |
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306 | } rfcomm_multiplexer_t;
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307 |
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308 | // info regarding an actual coneection
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309 | typedef struct {
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310 | // linked list - assert: first field
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311 | linked_item_t item;
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312 |
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313 | rfcomm_multiplexer_t *multiplexer;
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314 | uint16_t rfcomm_cid;
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315 | uint8_t outgoing;
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316 | uint8_t dlci;
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317 |
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318 | // number of packets granted to client
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319 | uint8_t packets_granted;
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320 |
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321 | // credits for outgoing traffic
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322 | uint8_t credits_outgoing;
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323 |
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324 | // number of packets remote will be granted
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325 | uint8_t new_credits_incoming;
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326 |
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327 | // credits for incoming traffic
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328 | uint8_t credits_incoming;
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329 |
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330 | // use incoming flow control
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331 | uint8_t incoming_flow_control;
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332 |
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333 | // channel state
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334 | RFCOMM_CHANNEL_STATE state;
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335 |
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336 | // state variables used in RFCOMM_CHANNEL_INCOMING
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337 | RFCOMM_CHANNEL_STATE_VAR state_var;
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338 |
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339 | // priority set by incoming side in PN
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340 | uint8_t pn_priority;
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341 |
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342 | // negotiated frame size
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343 | uint16_t max_frame_size;
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344 |
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345 | // local rpn data
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346 | rfcomm_rpn_data_t rpn_data;
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347 |
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348 | // rls line status. RFCOMM_RLS_STATUS_INVALID if not set
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349 | uint8_t rls_line_status;
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350 |
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351 | // msc modem status.
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352 | uint8_t msc_modem_status;
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353 |
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354 | // server channel (see rfcomm_service_t) - NULL => outgoing channel
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355 | rfcomm_service_t * service;
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356 |
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357 | // internal connection
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358 | btstack_packet_handler_t packet_handler;
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359 |
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360 | // client connection
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361 | void * connection;
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362 |
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363 | } rfcomm_channel_t;
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364 |
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365 | void rfcomm_packet_handler(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size);
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366 |
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367 | /** Embedded API **/
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368 |
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369 | // Set up RFCOMM.
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370 | void rfcomm_init(void);
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371 |
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372 | // Set security level required for incoming connections, need to be called before registering services
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373 | void rfcomm_set_required_security_level(gap_security_level_t security_level);
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374 |
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375 | // Register packet handler.
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376 | void rfcomm_register_packet_handler(void (*handler)(void * connection, uint8_t packet_type,
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377 | uint16_t channel, uint8_t *packet, uint16_t size));
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378 |
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379 | // Creates RFCOMM connection (channel) to a given server channel on a remote device with baseband address. A new baseband connection will be initiated if necessary.
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380 | // This channel will automatically provide enough credits to the remote side
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381 | void rfcomm_create_channel_internal(void * connection, bd_addr_t *addr, uint8_t channel);
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382 |
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383 | // Creates RFCOMM connection (channel) to a given server channel on a remote device with baseband address. new baseband connection will be initiated if necessary.
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384 | // This channel will use explicit credit management. During channel establishment, an initial amount of credits is provided.
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385 | void rfcomm_create_channel_with_initial_credits_internal(void * connection, bd_addr_t *addr, uint8_t server_channel, uint8_t initial_credits);
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386 |
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387 | // Disconencts RFCOMM channel with given identifier.
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388 | void rfcomm_disconnect_internal(uint16_t rfcomm_cid);
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389 |
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390 | // Registers RFCOMM service for a server channel and a maximum frame size, and assigns a packet handler. On embedded systems, use NULL for connection parameter.
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391 | // This channel provides automatically enough credits to the remote side.
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392 | void rfcomm_register_service_internal(void * connection, uint8_t channel, uint16_t max_frame_size);
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393 |
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394 | // Registers RFCOMM service for a server channel and a maximum frame size, and assigns a packet handler. On embedded systems, use NULL for connection parameter.
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395 | // This channel will use explicit credit management. During channel establishment, an initial amount of credits is provided.
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396 | void rfcomm_register_service_with_initial_credits_internal(void * connection, uint8_t channel, uint16_t max_frame_size, uint8_t initial_credits);
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397 |
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398 | // Unregister RFCOMM service.
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399 | void rfcomm_unregister_service_internal(uint8_t service_channel);
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400 |
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401 | // Accepts/Deny incoming RFCOMM connection.
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402 | void rfcomm_accept_connection_internal(uint16_t rfcomm_cid);
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403 | void rfcomm_decline_connection_internal(uint16_t rfcomm_cid);
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404 |
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405 | // Grant more incoming credits to the remote side for the given RFCOMM channel identifier.
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406 | void rfcomm_grant_credits(uint16_t rfcomm_cid, uint8_t credits);
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407 |
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408 | // Checks if RFCOMM can send packet. Returns yes if packet can be sent.
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409 | int rfcomm_can_send_packet_now(uint16_t rfcomm_cid);
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410 |
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411 | // Sends RFCOMM data packet to the RFCOMM channel with given identifier.
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412 | int rfcomm_send_internal(uint16_t rfcomm_cid, uint8_t *data, uint16_t len);
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413 |
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414 | // Sends Local Lnie Status, see LINE_STATUS_..
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415 | int rfcomm_send_local_line_status(uint16_t rfcomm_cid, uint8_t line_status);
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416 |
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417 | // Sned local modem status. see MODEM_STAUS_..
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418 | int rfcomm_send_modem_status(uint16_t rfcomm_cid, uint8_t modem_status);
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419 |
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420 | // Configure remote port
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421 | int rfcomm_send_port_configuration(uint16_t rfcomm_cid, rpn_baud_t baud_rate, rpn_data_bits_t data_bits, rpn_stop_bits_t stop_bits, rpn_parity_t parity, rpn_flow_control_t flow_control);
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422 |
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423 | // Query remote port
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424 | int rfcomm_query_port_configuration(uint16_t rfcomm_cid);
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425 |
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426 | // allow to create rfcomm packet in outgoing buffer
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427 | int rfcomm_reserve_packet_buffer(void);
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428 | void rfcomm_release_packet_buffer(void);
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429 | uint8_t * rfcomm_get_outgoing_buffer(void);
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430 | uint16_t rfcomm_get_max_frame_size(uint16_t rfcomm_cid);
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431 | int rfcomm_send_prepared(uint16_t rfcomm_cid, uint16_t len);
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432 |
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433 | #if defined __cplusplus
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434 | }
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435 | #endif
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436 |
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437 | #endif // __RFCOMM_H
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